CA1234282A - Method of changing fuel pump on internal combustion engine and apparatus for use therein - Google Patents
Method of changing fuel pump on internal combustion engine and apparatus for use thereinInfo
- Publication number
- CA1234282A CA1234282A CA000524834A CA524834A CA1234282A CA 1234282 A CA1234282 A CA 1234282A CA 000524834 A CA000524834 A CA 000524834A CA 524834 A CA524834 A CA 524834A CA 1234282 A CA1234282 A CA 1234282A
- Authority
- CA
- Canada
- Prior art keywords
- fuel pump
- block
- threaded
- push rod
- threaded bore
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
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Abstract
Abstract A method and apparatus for use in changing a fuel pump on an internal combustion engine, such as a V-8 engine of the type in which the fuel pump is mounted on the side of the engine block adjacent the front and there is provided a threaded bore which extends into the block and intersects a passage containing a cam actuated push rod for driving the fuel pump. The threaded bore is normally closed by a common threaded bolt which can be removed so that a specially designed holding device may then be threaded into the threaded bore in a fashion to engage the push rod and hold it in place when it becomes necessary to remove the fuel pump for repair or replacement. The holding device may be provided with threads which will strip more readily than the threads of the engine block in the bore or with a soft inner end so that any tendency to over tighten the device when it is installed to hold the push rod will not result in damage to the push rod. After the fuel pump is replaced the holding device it removed to free the push rod and the common bolt is again reinserted to block the threaded bore.
By holding the push rod in the manner described above, the push rod cannot slide from its normal position, which disk placement has in the past caused considerable extra work when one attempts to replace the fuel pump.
By holding the push rod in the manner described above, the push rod cannot slide from its normal position, which disk placement has in the past caused considerable extra work when one attempts to replace the fuel pump.
Description
~42~
This invention relates to a method and apparatus for changing a fuel pump of an internal combustion engine of the type having a fuel pump mounted on one side of the engine and driven by a push rod which is reciprocated by an internal camshaft of the engine.
In all V-8 engines produced by General Motors from the year 1955 to the present, the fuel pump is mounted on the right hand side of the engine at a location a short distance from the front of the engine. The fuel pump is driven by the usual single camshaft of the engine which extends long-tudinally of the engine and is centrally disposed in the engine. A push rod extends between the camshaft and an actuator member of the fuel pump and reciprocates on rota-lion of the camshaft. Because the camshaft is located in a plane above the level of the fuel pump, the push rod is disposed in a slanted position with the actuator engaging or outer end being lower than the cam engaging. When the fuel pump is removed for repair or replacement, the push rod tends to slide toward the outside of the engine 90 that when the fuel pump is being replaced, the push rod may have to be reinserted into its operating position. Because of the internal structure of the engine and the need to have the outer end of the push rod held against the actuator of the fuel pump while the fuel pump is moved into position for bolting to the engine, many tedious and frustrating attempts are usually required to properly relocate the push rod, and thus the labor cots involved in repairing or replacing the fuel pump are unacceptably high.
~39L;~
In all of the above-ldentified ~1-8 engines of General Motors, which include engines identified by the cubic inch displacement volumes of 265, 283, 305, 307, 327 and 350, there are provided at the front end of the engine a number of threaded bores in the engine block, the bores being closed by way of short bolts screwed into the block. The bores, one of which intersects the passage through which the push rod extends, normally do not serve any purpose but are provided to allow for special engine mounting arrangements or the mounting of accessories.
It is an object of the present invention to provide a special screw means which can be used after the bolt normally received in the bore intersecting the push rod passage has been temporarily removed so as to gently hold the push rod against displacement when the fuel pump is removed for repair or replacement.
The screw means or holding device of the present invention includes an elongated member of a length longer than the threaded bore which extends into the engine block from the front thereof and intersects the push rod con-twining passage, the elongated member having an inner push rod engaging end, an outer end for finger engagement when turning the member into or out of the threaded bore, and an intermediate threaded portion.
According to another aspect of the present invention there is provided a method of changing the fuel pump of an engine of the above described type, which method includes the steps of removing the bolt from the threaded bore in the ~3~L28;;~
front of the block of the engine and hand threading into the bore a push rod holding device having a push rod engaging end and a threaded intermediate portion. The device is tightened by hand only sufficient to press against the push rod and thereby hold the push rod against movement in its passage. The bolt means which secure the fuel pump to the engine block are then removed, and subsequently the repaired or replacement pump is placed in position with the inner face thereof in engagement with the machined surface of the block and the actuator thereof extending into the passage and engaging the outer end of the push rod. The bolt means are then rethreaded into the block to hold the fuel pump in place. The holding device is then removed from the threaded bore in the front of the engine and the bolt is replaced in the threaded bore.
In the accompanying drawings which illustrate embody-mints of the invention, Figure 1 is a front view of an engine of the type in which the present invention can be used in the changing of a fuel pump;
Figure 2 is a side view of the engine of Figure 1 as seen from the right hand side;
Figure 3, which appears on the same sheet as Figure 1, is a partial sectional view through the engine of Figure 1, cut away along the line 3--3 of Figure 2 to show the relative position of the fuel pump, push rod and camshaft;
Figure 4 is a simplified, partial side view of the engine with a portion cut away in the area of the fuel pump to illustrate the position of the push rod;
I
Figure 5 is a side vie of the holding device of the present invention;
Figure 6 is a cross sectional view through a portion of the engine as seen from the line 6--6 of Figure 1, but with the holding device of Figure 5 in position;
Figure 7 is an enlarged cross section of a portion of the threaded engagement between the holding device and the engine block, and Figure 8 is a side view of an embodiment of the holding device which is an alternative to that shown in Figure 5.
In Figures 1 and 2, the reference number 10 denotes a V-8 engine of a type used by General Motors in automobiles and light trucks since 1955 and in which a mechanical fuel pump if is mounted at a low position immediately adjacent the front of the engine on the right hand side thereof. The fuel pump is removably secured to the side of engine block 12 by means 13 which is in the form of a pair of bolts. The engine block is cast iron, and an area 14 of the block immediately under the fuel pump is machined. A gasket 19 is provided between an inner mounting surface of the fuel pump and the machined area 14 of the block. A centrally disposed camshaft 15, which extends the length of the engine is driven by a crankshaft 16 of the engine. The camshaft 15, in addition to operating intake and exhaust valves (not shown) of the engine, drives the fuel pump 11 by way of a push rod 17. The fuel pump when activated during operation of the engine draws fuel by way of a line or conduit 20 from a fuel tank of the vehicle and delivers the fuel by way of another fuel line 21 to a carburetor (not I
shown) located in a central position on top of the engine.
In the manufacture of the engine, a plurality of bores are provided at the front of the engine. The bores, which are threaded and extend rearwardly from the front surface of the engine, are provided to allow for special mounting arrange-mints or for the attachment of special accessories, and normally are closed by way of common USE bolts 23 which are threaded into the threaded bores As may be observed in Figure 3, the camshaft 15 is disposed in a plane which is located above the fuel pump 11 so that the push rod 17 slants downwardly from a camshaft engaging end 25 to an outer or fuel pump actuating end 26.
Immediately within the machined area 14 on which the fuel pump 11 is mounted, the block it provided with an enlarged opening 27 into which an actuating member or arm 28 of the fuel pump extends. The actuating arm 28 is biased to an outwardly extending position so that engagement of the act tufting arm with the push rod normally pushes the push rod in firm engagement with the camshaft, i.e., the push rod is held in engagement at all times at opposite ends between the actuating arm at its outer end and the camshaft at its inner end. On rotation of the camshaft 15, an eccentric lobe 30 thereof pushes the push rod outwardly so as to push the actuating arm towards the fuel pump. As the camshaft no-tales further and the lobe turns to the opposite side of the camshaft, the biased actuating arm is free to push the push rod back. The push rod therefore experiences a reciprocal tying action in a passage 31 within the block 12. The small I
pivoting action experienced by the actuating arm as it is pushed toward the fuel pump by the push rod and it then allowed to be biased back provides the pumping forces within the fuel pump while the engine is running.
During the normal life of an engine of the type described above, a malfunction, such as a rupture in the pumping diaphragm or a break-down of the one-way valves provided in the inlet and outlet of the fuel pump, usually develops one or more times, and this necessitates the removal of the fuel pump for the purpose of overhauling or replacement by a new or rebuilt unit. To remove the existing fuel pump, inlet or supply line 20 and the outlet line 21 are disconnected. the securing means 13 in the form of the bolts are then removed so that the fuel pump can be pulled away from the engine. When the fuel pump is pulled away from the engine and the actuator arm 28 disengages the outer endow the push rod 17, which is about 5 3/4 inches long, about 1/2 inch in diameter and weighs about five ounces, and the push rod it free to slide downwardly in its passage 31. As a result, when the replacement fuel pump is brought into position the push rod must be moved back into its normal position and this involves ensuring that the inner end 25 of the push rod is moved into its proper position relative to the camshaft, which is a difficult procedure because the inner end of the push rod is approximately 6 inches inside of the engine block and cannot be seen while only a very short part of the outer end of the push rod is accessible. Moreover, because the actuator arm is spring biased ou~wasrd from the fuel pump, the actuator ~23~2~
arm engages the push rod before the base of the fuel pump engages the machined area I of the engine block. It then becomes necessary to ensure that the push rod remains in its proper place by its engagement with the spring biased actuator arm as the fuel pump is pushed against the biasing force of the actuator arm to its proper location against the side of the engine. As this entire exercise becomes virtually impossible to accomplish, various make-shift tools, such as bent knives feeler gauges, strips of sheet metal screwdrivers have been devised for use in an attempt to insert something behind the fuel pump for holding the push rod until the fuel pump substantially reaches its mounted potion, An alternative approach which is tried as well involves the use of a heavy grease around the push rod to hold it in place as the fuel pump is moved into place, but this is usually not successful because the engine heat melts the grease and allows the push rod to become displaced.
In the TV engines of the above described type, the threaded bore 42 closed by the bolt 23, which is the upper one at the front adjacent the fuel pump, intersects the passage 31 as can best be seen in Figure 6. The distance D, as shown in Figure 6, which is the distance from the front face of the engine block to the front surface of the push rod within the passage 31, is 1 inch. This is the distance as measured axially through bore 42, which is provided with internal threads 43.
Holding device 33 of the present invention, as isles treated in Figure 3, consists of an elongated member which is Lowe formed of a material, such as aluminum, or other material softer than the cast iron in the engine block. The outer end of the elongated member is preferably of cylindrical shape head 34 with a knurled outer surface of about 1/2 inch diameter and 1/2 inch length. The cylindrical shape is economical to produce in an item of the nature of holding device, but of more importance, this shape is preferable to a square or hexagonal shape so as to encourage tightening by hand rather than with a wrench. The inner end of the holding device includes a smaller cylindrical portion or projection 36, which terminates in a flat smooth push rod engaging end 35. As the threaded bore is 3/8 inch nominal, the cylindrical portion 36 is of slightly smaller diameter than the internal diameter of the internal threads 42 of the bore. In the illustrated embodiment of Figure 5, the diameter of the portion 36 is 1/4 inch OLD. The surface of end 35 is separated from the cylindrical surface of portion 36 by way of a tapered surface to avoid any sharp edge.
An intermediate portion consisting of an unthreaded portion 39 immediately inside of the knurled head 34 and a threaded portion 40 is nominally 3/8 inch with the threaded portion being 3/8 US threads for reception in the internally threaded 3/8 internally threaded bore 42. The threaded portion 40 is separated from the inner cylindrical end portion 36 by a tapered portion or shoulder 37. In the illustrated embodiment of the holding device 33 shown in Figure 57 the length of the inner cylindrical projection is 3/4 inch and the length of the tapered portion separating the cylindrical end portion 36 and the threaded portion is I
1/16 inch. In the intermediate portion, the threaded port Tony and -the unthreaded cylindrical portion are of a length of about 3/8 inch and 5/16 inch, respectively.
As previously indicated, the distance from the front face of the engine block to the push rod 17 in the passage 31 is 1 inch. Thus, when the holding device 33 is threaded into the bore 42 a distance to bring the end 35 against the push rod 17, only about 3/16 inch or about 2 1/2 to 3 threads of the threaded portion 40 are threaded into the internal threads 43 of the bore 42. In 3/8 US threading, the outside dimension of the threads, as shown at 41b in Figure 7, is actually under-sized by about of 4/1000 of an inch. In the illustrated embodiment of the invention of Figures 5 to 7, at least the first 2 1/2 to 3 threads, as shown at aye in Figure 7, are purposely made of a greater under-size, say ~/1000 inch, this being illustrated in a somewhat exaggerated form in Figure 7, so as to provide a safety feature for preventing the holding device from being tightened to tile extent that damage is caused to the push rod 17, as will be described in more detail below.
According to the method of the invention, when it becomes necessary to replace a fuel pump, the 3/8 inch bolt is removed from the threaded bore, and the holding device 33 is threaded by hand into the bore 42 and it is tightened only sufficiently tight to hold the push rod 17 against the opposite side of passage 31 as shown in Figure 6. As the holding device 33 is threaded into the bore 42, it contacts the snide of the push rod at a point shown as 50 in figure 3.
If one attempts to unduly tighten the holding device 33, say by turning it with pliers, the fact it it made of a .,; 9 ~.~3~L,r~
relatively soft material and the threads which have entered bore 42 are undersized the tips aye of the threads will tend to strip away before sufficient pressure is applied to damage the push rod or strip the internal -threads 43 of the bore. Having inserted the holding device 33, the inlet and outlet lines 20 and 21 are disconnected, and the bolts which secure the fuel pump to the engine block are removed so that the fuel pump can be taken from the engine. When installing the new or reconditioned pump 11, the gasket 19 and gasket go are applied to the pump, and after the actuator arm is pushed against the outer end of the push rod, the bolts are reinserted to connect the pump to the engine. The lines 20 and 21 are then reconnected, and at this stage the holding device 23 can be removed and the normal 3/8 inch bolt replaced in the bore 42.
In the alternative embodiment shown in Figure 8, the holding device may be formed of harder metal. In this embodiment the finger engaging portion is shown as being in the form of a flat portion aye, which is more of the wing-nut fashion. The threaded portion aye, which is inward from the cylindrical portion aye and separated from the inner cylindrical portion aye by shoulder aye, is a normal 3/8 US
thread. The inner end 35 is formed, however, by a soft insert 45, such as brass, to avoid damage of the push rod by over-tightening of the holding device.
further alternatives and modifications to the above described embodiments of the invention will be obvious to those skilled in the art without departing from the spirit of the invention as defined in the appending claims.
This invention relates to a method and apparatus for changing a fuel pump of an internal combustion engine of the type having a fuel pump mounted on one side of the engine and driven by a push rod which is reciprocated by an internal camshaft of the engine.
In all V-8 engines produced by General Motors from the year 1955 to the present, the fuel pump is mounted on the right hand side of the engine at a location a short distance from the front of the engine. The fuel pump is driven by the usual single camshaft of the engine which extends long-tudinally of the engine and is centrally disposed in the engine. A push rod extends between the camshaft and an actuator member of the fuel pump and reciprocates on rota-lion of the camshaft. Because the camshaft is located in a plane above the level of the fuel pump, the push rod is disposed in a slanted position with the actuator engaging or outer end being lower than the cam engaging. When the fuel pump is removed for repair or replacement, the push rod tends to slide toward the outside of the engine 90 that when the fuel pump is being replaced, the push rod may have to be reinserted into its operating position. Because of the internal structure of the engine and the need to have the outer end of the push rod held against the actuator of the fuel pump while the fuel pump is moved into position for bolting to the engine, many tedious and frustrating attempts are usually required to properly relocate the push rod, and thus the labor cots involved in repairing or replacing the fuel pump are unacceptably high.
~39L;~
In all of the above-ldentified ~1-8 engines of General Motors, which include engines identified by the cubic inch displacement volumes of 265, 283, 305, 307, 327 and 350, there are provided at the front end of the engine a number of threaded bores in the engine block, the bores being closed by way of short bolts screwed into the block. The bores, one of which intersects the passage through which the push rod extends, normally do not serve any purpose but are provided to allow for special engine mounting arrangements or the mounting of accessories.
It is an object of the present invention to provide a special screw means which can be used after the bolt normally received in the bore intersecting the push rod passage has been temporarily removed so as to gently hold the push rod against displacement when the fuel pump is removed for repair or replacement.
The screw means or holding device of the present invention includes an elongated member of a length longer than the threaded bore which extends into the engine block from the front thereof and intersects the push rod con-twining passage, the elongated member having an inner push rod engaging end, an outer end for finger engagement when turning the member into or out of the threaded bore, and an intermediate threaded portion.
According to another aspect of the present invention there is provided a method of changing the fuel pump of an engine of the above described type, which method includes the steps of removing the bolt from the threaded bore in the ~3~L28;;~
front of the block of the engine and hand threading into the bore a push rod holding device having a push rod engaging end and a threaded intermediate portion. The device is tightened by hand only sufficient to press against the push rod and thereby hold the push rod against movement in its passage. The bolt means which secure the fuel pump to the engine block are then removed, and subsequently the repaired or replacement pump is placed in position with the inner face thereof in engagement with the machined surface of the block and the actuator thereof extending into the passage and engaging the outer end of the push rod. The bolt means are then rethreaded into the block to hold the fuel pump in place. The holding device is then removed from the threaded bore in the front of the engine and the bolt is replaced in the threaded bore.
In the accompanying drawings which illustrate embody-mints of the invention, Figure 1 is a front view of an engine of the type in which the present invention can be used in the changing of a fuel pump;
Figure 2 is a side view of the engine of Figure 1 as seen from the right hand side;
Figure 3, which appears on the same sheet as Figure 1, is a partial sectional view through the engine of Figure 1, cut away along the line 3--3 of Figure 2 to show the relative position of the fuel pump, push rod and camshaft;
Figure 4 is a simplified, partial side view of the engine with a portion cut away in the area of the fuel pump to illustrate the position of the push rod;
I
Figure 5 is a side vie of the holding device of the present invention;
Figure 6 is a cross sectional view through a portion of the engine as seen from the line 6--6 of Figure 1, but with the holding device of Figure 5 in position;
Figure 7 is an enlarged cross section of a portion of the threaded engagement between the holding device and the engine block, and Figure 8 is a side view of an embodiment of the holding device which is an alternative to that shown in Figure 5.
In Figures 1 and 2, the reference number 10 denotes a V-8 engine of a type used by General Motors in automobiles and light trucks since 1955 and in which a mechanical fuel pump if is mounted at a low position immediately adjacent the front of the engine on the right hand side thereof. The fuel pump is removably secured to the side of engine block 12 by means 13 which is in the form of a pair of bolts. The engine block is cast iron, and an area 14 of the block immediately under the fuel pump is machined. A gasket 19 is provided between an inner mounting surface of the fuel pump and the machined area 14 of the block. A centrally disposed camshaft 15, which extends the length of the engine is driven by a crankshaft 16 of the engine. The camshaft 15, in addition to operating intake and exhaust valves (not shown) of the engine, drives the fuel pump 11 by way of a push rod 17. The fuel pump when activated during operation of the engine draws fuel by way of a line or conduit 20 from a fuel tank of the vehicle and delivers the fuel by way of another fuel line 21 to a carburetor (not I
shown) located in a central position on top of the engine.
In the manufacture of the engine, a plurality of bores are provided at the front of the engine. The bores, which are threaded and extend rearwardly from the front surface of the engine, are provided to allow for special mounting arrange-mints or for the attachment of special accessories, and normally are closed by way of common USE bolts 23 which are threaded into the threaded bores As may be observed in Figure 3, the camshaft 15 is disposed in a plane which is located above the fuel pump 11 so that the push rod 17 slants downwardly from a camshaft engaging end 25 to an outer or fuel pump actuating end 26.
Immediately within the machined area 14 on which the fuel pump 11 is mounted, the block it provided with an enlarged opening 27 into which an actuating member or arm 28 of the fuel pump extends. The actuating arm 28 is biased to an outwardly extending position so that engagement of the act tufting arm with the push rod normally pushes the push rod in firm engagement with the camshaft, i.e., the push rod is held in engagement at all times at opposite ends between the actuating arm at its outer end and the camshaft at its inner end. On rotation of the camshaft 15, an eccentric lobe 30 thereof pushes the push rod outwardly so as to push the actuating arm towards the fuel pump. As the camshaft no-tales further and the lobe turns to the opposite side of the camshaft, the biased actuating arm is free to push the push rod back. The push rod therefore experiences a reciprocal tying action in a passage 31 within the block 12. The small I
pivoting action experienced by the actuating arm as it is pushed toward the fuel pump by the push rod and it then allowed to be biased back provides the pumping forces within the fuel pump while the engine is running.
During the normal life of an engine of the type described above, a malfunction, such as a rupture in the pumping diaphragm or a break-down of the one-way valves provided in the inlet and outlet of the fuel pump, usually develops one or more times, and this necessitates the removal of the fuel pump for the purpose of overhauling or replacement by a new or rebuilt unit. To remove the existing fuel pump, inlet or supply line 20 and the outlet line 21 are disconnected. the securing means 13 in the form of the bolts are then removed so that the fuel pump can be pulled away from the engine. When the fuel pump is pulled away from the engine and the actuator arm 28 disengages the outer endow the push rod 17, which is about 5 3/4 inches long, about 1/2 inch in diameter and weighs about five ounces, and the push rod it free to slide downwardly in its passage 31. As a result, when the replacement fuel pump is brought into position the push rod must be moved back into its normal position and this involves ensuring that the inner end 25 of the push rod is moved into its proper position relative to the camshaft, which is a difficult procedure because the inner end of the push rod is approximately 6 inches inside of the engine block and cannot be seen while only a very short part of the outer end of the push rod is accessible. Moreover, because the actuator arm is spring biased ou~wasrd from the fuel pump, the actuator ~23~2~
arm engages the push rod before the base of the fuel pump engages the machined area I of the engine block. It then becomes necessary to ensure that the push rod remains in its proper place by its engagement with the spring biased actuator arm as the fuel pump is pushed against the biasing force of the actuator arm to its proper location against the side of the engine. As this entire exercise becomes virtually impossible to accomplish, various make-shift tools, such as bent knives feeler gauges, strips of sheet metal screwdrivers have been devised for use in an attempt to insert something behind the fuel pump for holding the push rod until the fuel pump substantially reaches its mounted potion, An alternative approach which is tried as well involves the use of a heavy grease around the push rod to hold it in place as the fuel pump is moved into place, but this is usually not successful because the engine heat melts the grease and allows the push rod to become displaced.
In the TV engines of the above described type, the threaded bore 42 closed by the bolt 23, which is the upper one at the front adjacent the fuel pump, intersects the passage 31 as can best be seen in Figure 6. The distance D, as shown in Figure 6, which is the distance from the front face of the engine block to the front surface of the push rod within the passage 31, is 1 inch. This is the distance as measured axially through bore 42, which is provided with internal threads 43.
Holding device 33 of the present invention, as isles treated in Figure 3, consists of an elongated member which is Lowe formed of a material, such as aluminum, or other material softer than the cast iron in the engine block. The outer end of the elongated member is preferably of cylindrical shape head 34 with a knurled outer surface of about 1/2 inch diameter and 1/2 inch length. The cylindrical shape is economical to produce in an item of the nature of holding device, but of more importance, this shape is preferable to a square or hexagonal shape so as to encourage tightening by hand rather than with a wrench. The inner end of the holding device includes a smaller cylindrical portion or projection 36, which terminates in a flat smooth push rod engaging end 35. As the threaded bore is 3/8 inch nominal, the cylindrical portion 36 is of slightly smaller diameter than the internal diameter of the internal threads 42 of the bore. In the illustrated embodiment of Figure 5, the diameter of the portion 36 is 1/4 inch OLD. The surface of end 35 is separated from the cylindrical surface of portion 36 by way of a tapered surface to avoid any sharp edge.
An intermediate portion consisting of an unthreaded portion 39 immediately inside of the knurled head 34 and a threaded portion 40 is nominally 3/8 inch with the threaded portion being 3/8 US threads for reception in the internally threaded 3/8 internally threaded bore 42. The threaded portion 40 is separated from the inner cylindrical end portion 36 by a tapered portion or shoulder 37. In the illustrated embodiment of the holding device 33 shown in Figure 57 the length of the inner cylindrical projection is 3/4 inch and the length of the tapered portion separating the cylindrical end portion 36 and the threaded portion is I
1/16 inch. In the intermediate portion, the threaded port Tony and -the unthreaded cylindrical portion are of a length of about 3/8 inch and 5/16 inch, respectively.
As previously indicated, the distance from the front face of the engine block to the push rod 17 in the passage 31 is 1 inch. Thus, when the holding device 33 is threaded into the bore 42 a distance to bring the end 35 against the push rod 17, only about 3/16 inch or about 2 1/2 to 3 threads of the threaded portion 40 are threaded into the internal threads 43 of the bore 42. In 3/8 US threading, the outside dimension of the threads, as shown at 41b in Figure 7, is actually under-sized by about of 4/1000 of an inch. In the illustrated embodiment of the invention of Figures 5 to 7, at least the first 2 1/2 to 3 threads, as shown at aye in Figure 7, are purposely made of a greater under-size, say ~/1000 inch, this being illustrated in a somewhat exaggerated form in Figure 7, so as to provide a safety feature for preventing the holding device from being tightened to tile extent that damage is caused to the push rod 17, as will be described in more detail below.
According to the method of the invention, when it becomes necessary to replace a fuel pump, the 3/8 inch bolt is removed from the threaded bore, and the holding device 33 is threaded by hand into the bore 42 and it is tightened only sufficiently tight to hold the push rod 17 against the opposite side of passage 31 as shown in Figure 6. As the holding device 33 is threaded into the bore 42, it contacts the snide of the push rod at a point shown as 50 in figure 3.
If one attempts to unduly tighten the holding device 33, say by turning it with pliers, the fact it it made of a .,; 9 ~.~3~L,r~
relatively soft material and the threads which have entered bore 42 are undersized the tips aye of the threads will tend to strip away before sufficient pressure is applied to damage the push rod or strip the internal -threads 43 of the bore. Having inserted the holding device 33, the inlet and outlet lines 20 and 21 are disconnected, and the bolts which secure the fuel pump to the engine block are removed so that the fuel pump can be taken from the engine. When installing the new or reconditioned pump 11, the gasket 19 and gasket go are applied to the pump, and after the actuator arm is pushed against the outer end of the push rod, the bolts are reinserted to connect the pump to the engine. The lines 20 and 21 are then reconnected, and at this stage the holding device 23 can be removed and the normal 3/8 inch bolt replaced in the bore 42.
In the alternative embodiment shown in Figure 8, the holding device may be formed of harder metal. In this embodiment the finger engaging portion is shown as being in the form of a flat portion aye, which is more of the wing-nut fashion. The threaded portion aye, which is inward from the cylindrical portion aye and separated from the inner cylindrical portion aye by shoulder aye, is a normal 3/8 US
thread. The inner end 35 is formed, however, by a soft insert 45, such as brass, to avoid damage of the push rod by over-tightening of the holding device.
further alternatives and modifications to the above described embodiments of the invention will be obvious to those skilled in the art without departing from the spirit of the invention as defined in the appending claims.
Claims (4)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a method of removing and replacing a fuel pump on an internal combustion engine of the type including an engine block, a rotatable cam extending longitudinally of said block, said fuel pump being located externally of said block at a location on one side of said block adjacent a front end thereof, said block having at the fuel pump loca-tion a machined external face and a passage extending from said cam to said machined external face, a threaded bore extending into said block from said front end thereof and perpendicularly intersecting said passage, a bolt being normally threaded into and closing said threaded bore, said fuel pump having an inner mounting surface for engagement against said machined face of said block, bolt means for threaded acceptance in threaded bores in said block for securing said fuel pump to said block, said fuel pump having an actuator extending into said passage, and a push rod in said passage and having an inner end engaging said cam so as to be reciprocated thereby on rotation of said cam and an outer end in engagement with said actuator of said fuel pump; the improvement of:
1) removing said bolt from the threaded bore in said front end of said block, 2) hand threading into said threaded bore a device having a threaded intermediate portion and push rod engaging inner end, 3) tightening said device by hand only sufficiently to press against said push rod and thereby hold said push rod against movement in said passage, 4) removing said bolt means securing said fuel pump to said engine block, 5) placing the replacement fuel pump into position with the inner face thereof engaging the machined surface of said block and the actuator thereof extending into said passage and engaging the outer end of said push rod, 6) rethreading the bolt means into said block to secure the fuel pump to said block, 7) removing said device from the threaded bore at the front of said block, and 8) replacing said bolt in said threaded bore.
1) removing said bolt from the threaded bore in said front end of said block, 2) hand threading into said threaded bore a device having a threaded intermediate portion and push rod engaging inner end, 3) tightening said device by hand only sufficiently to press against said push rod and thereby hold said push rod against movement in said passage, 4) removing said bolt means securing said fuel pump to said engine block, 5) placing the replacement fuel pump into position with the inner face thereof engaging the machined surface of said block and the actuator thereof extending into said passage and engaging the outer end of said push rod, 6) rethreading the bolt means into said block to secure the fuel pump to said block, 7) removing said device from the threaded bore at the front of said block, and 8) replacing said bolt in said threaded bore.
2. A holding device for use in removing and replacing a fuel pump on an internal combustion engine of the type including an engine block, a rotatable cam extending longitudinally of said block, said fuel pump being located externally of said block at a fuel pump location on one side of said block adjacent a front end thereof, said block having at said fuel pump location a machined external face and a passage extending from said cam to said machined external face, a threaded bore extending into said block from said front end thereof and perpendicularly intersecting said passage, a bolt being normally threaded into and closing said threaded bore, said fuel pump having an inner mounting surface for engagement against said machined face of said block, bolt means for threaded acceptance in threaded bores in said block for securing said fuel pump to said block, said fuel pump having an actuator extending into said passage, and a push rod in said passage and having an inner end engaging said cam so as to be reciprocated thereby on rotation of said cam and an outer end in engagement with said actuator of said fuel pump, said threaded bore being aligned with a side surface of said push rod in said past sage, said side surface of said push rod being a fixed pre-determined distance from the front of said block at the outer end of said threaded bore;
said holding device comprising:
an elongated member formed of steel and having a length greater than said threaded bore, said member having an inner, push rod engaging end with an insert of soft material, an outer end for finger engagement and an intermediate threaded portion for threaded reception in said threaded bore.
3. A holding device for use in removing and replacing a fuel pump on an internal combustion engine of the type including an engine block, a rotatable cam extending longitudinally of said block, said fuel pump being located externally of said block at a fuel pump location on one side of said block adjacent a front end thereof, said block having at said fuel pump location a machined external face and a passage extending from said cam to said machined external face, a threaded bore extending into said block from said front end thereof and perpendicularly intersecting
said holding device comprising:
an elongated member formed of steel and having a length greater than said threaded bore, said member having an inner, push rod engaging end with an insert of soft material, an outer end for finger engagement and an intermediate threaded portion for threaded reception in said threaded bore.
3. A holding device for use in removing and replacing a fuel pump on an internal combustion engine of the type including an engine block, a rotatable cam extending longitudinally of said block, said fuel pump being located externally of said block at a fuel pump location on one side of said block adjacent a front end thereof, said block having at said fuel pump location a machined external face and a passage extending from said cam to said machined external face, a threaded bore extending into said block from said front end thereof and perpendicularly intersecting
Claim 3 contd. 2 said passage, a bolt being normally threaded into and closing said threaded bore, said fuel pump having an inner mounting surface for engagement against said machined face of said block, bolt means for threaded acceptance in threaded bores in said block for securing said fuel pump to said block, said fuel pump having an actuator extending into said passage, and a push rod in said passage and having an inner end engaging said cam so as to be reciprocated thereby on rotation of said cam and an outer end in engagement with said actuator of said fuel pump, said threaded bore being aligned with a side surface of said push rod in said pas-sage, said side surface of said push rod being a fixed pre-determined distance from the front of said block at the outer end of said threaded bore;
said holding device comprising:
an elongated member formed of aluminum and having a length greater than said threaded bore, said member having an inner push rod engaging end, an outer end for finger engagement and an intermediate threaded portion for threaded reception in said threaded bore, at least an initial part of said threaded portion adjacent said projection having a slightly under-sized outside diameter with the threaded portion being of 3/8 USS threading and said initial part being about 8/1000 inch under-sized, an elongated cylindrical projection extends coaxially from said threaded intermediate portion and terminates in said inner end, said projection being of smaller diameter than the inner diameter of said threaded portion, and joined to said threaded section by a tapered shoulder, the distance between the inner end of said projection and the outer end of said threaded portion being slightly longer than said predetermined distance.
said holding device comprising:
an elongated member formed of aluminum and having a length greater than said threaded bore, said member having an inner push rod engaging end, an outer end for finger engagement and an intermediate threaded portion for threaded reception in said threaded bore, at least an initial part of said threaded portion adjacent said projection having a slightly under-sized outside diameter with the threaded portion being of 3/8 USS threading and said initial part being about 8/1000 inch under-sized, an elongated cylindrical projection extends coaxially from said threaded intermediate portion and terminates in said inner end, said projection being of smaller diameter than the inner diameter of said threaded portion, and joined to said threaded section by a tapered shoulder, the distance between the inner end of said projection and the outer end of said threaded portion being slightly longer than said predetermined distance.
4. The device of claim 3, wherein the distance between the inner end of said projection and the transition from said undersized threads to the normal threading is approximately 1 inch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000524834A CA1234282A (en) | 1986-12-09 | 1986-12-09 | Method of changing fuel pump on internal combustion engine and apparatus for use therein |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000524834A CA1234282A (en) | 1986-12-09 | 1986-12-09 | Method of changing fuel pump on internal combustion engine and apparatus for use therein |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1234282A true CA1234282A (en) | 1988-03-22 |
Family
ID=4134513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000524834A Expired CA1234282A (en) | 1986-12-09 | 1986-12-09 | Method of changing fuel pump on internal combustion engine and apparatus for use therein |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1234282A (en) |
-
1986
- 1986-12-09 CA CA000524834A patent/CA1234282A/en not_active Expired
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |