DE2312383A1 - OIL CHANGE PROCEDURE - Google Patents

Description

oil change procedure

The invention relates to internal combustion engines, in particular to regular oil changes in such engines. The invention is particularly applicable to vehicle fleets, plant vehicles, as well as construction equipment and other vehicles, where there was both speed in changing the oil and dirt-free oil in reducing the masohinen- management costs play a significant role,

The conventional oil change procedure, in which the oil is by means of Gravity drain is done by removing a plug from the crankcase oil sump and replacing the oil by pouring new oil from a can into an open filling pipe has many disadvantages in industrial vehicles « The procedure is slow and cumbersome and the vehicle must be maneuvered over jacks or pits so that one can reach the drain plug »As a result

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its oil changes are often postponed until they coincide with other maintenance work, but what helps to shorten the service life of the engine. The draining using gravity points against At the end of the discharge process, the lowest flow velocity, namely when most of the sludge and Dirt is to be removed and the consequence is that a large part of the sludge is left in the crankcase pan The process of collecting the old oil in a funnel often results in oil spillage, and it often happens that the drain plugs are lost, damaged or screwed on at an angle. The plugs must be reinserted firmly to ensure that they are not loosened by vibration, during the filling there is a continuous introduction of contamination takes place in the new oil and the crankcase into it, since the filler pipe and the new oil of the moisture and are exposed to dust in the surrounding air. In addition, it is also possible that the oil level is checked inaccurately, unless the new oil is given enough time to drain into the oil pan. All these Factors are particularly critical when it comes to rolling stock, plant vehicles, or construction equipment because they are Vehicles, monitoring engine life and downtime is crucial for profitable operation is"

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The object of the invention "is to provide a A method and a device for eliminating the above-mentioned disadvantages of the oil change method by utilizing the force of gravity and to create a quick, easy maintenance, without elevators and pits on level Ir & e can be carried out.

A particular feature of the invention is to provide an oil change system of this type that utilizes a simple equipment for modification of the vehicle can be adapted to any existing vehicle

This avoids any spillage of oil and the drain plug cannot be lost or lost to be damaged? there are also facilities for storing and handling the old oil.

The improved system of this type offers the special Advantage that the oil drain plug is replaced by equipment that is not actuated during the oil change are needed and permanently "attached" to the vehicle in this way is that it cannot be released by vibrations "

Another advantage of this system is that

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Contamination cannot enter the crankcase or the new oil, as this system is always closed and the new oil and the crankcase are in an "enclosed space" and not exposed to the ambient air sindo

With this improved oil changer, the oil runs quickly and at a constant speed afc, which leaves a greater amount of oil on the bottom of the crankcase pan dirt and sludge is removed than with the usual gravity method. "

In the 'procedure of this type, the oil is also measured to ensure a correct filling, and the oil level can be checked immediately after pulling »

The oil change system according to the invention can be different Types of maintenance work as well as maintenance work various Adjust the extent ».

In short, the invention is directed to a lubricating oil change method, in which the drain plug of the crankcase pan is replaced by a connector, which to an upwardly running hose with a self-sealing coupling half, the old oil through connection

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the coupling half with a leading the oil to a container The vacuum pump is emptied and new oil is poured in via the coupling half and the hose from a closed container the crankcase is released into it »

The device according to the invention comprises, in short,
the above-mentioned connector, the hose and the self-sealing coupling half, a bearing bracket which fixes the coupling half preferably in the vicinity of the oil dipstick, and pumping devices which are used to remove the
old oil and delivery of the new oil with the coupling half
can be connected. The pumping device can comprise a single unit with both emptying and dispensing options or also separate emptying and dispensing units.

It shows:

! Pig. 1 is a front view of a vehicle engine to which the Connector, hose and coupling half are connected according to the invention,

ig. 2 is a perspective view of the installation with the oil pan connector, the hose, the bearing bracket of the self-sealing coupling half and the dust cap, which together form the modification equipment for
can form a vehicle so that the "system according to
the invention can be used,

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Pig. 3 a perspective view of a gas-powered "benen combined emptying and rinsing unit, which can be used in the rear of a truck or "in stationary operation,

. 4 an electrical circuit diagram of the in Pig. 3 shown Unit,

ο 5 a perspective view of a unit similar of those that were shown in Pig ο 3, however when driven by electric motors,

Pig ο 6 an electrical circuit diagram of the one shown in Pig »5 Unit, .

Pig ο 7 a perspective partial representation of the connections the new and old oil cylinders with the unit shown in Pig «3,

Pig. 8 is a perspective view to explain the manner in which the emptying and purging unit according to Pig "3 and 5 with the visual clutch coupling is connected in the vehicle,

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9 is a perspective view of the measuring device for the oil discharged through the clutch,

10 is a perspective view of portable pump units for emptying and filling,

11 shows a perspective partial representation of a Venturi emptying system, the existing vehicles can be adapted for the lubrication of construction equipment, which oil changes are carried out on the premises,

Figo 12 is a section through the relief valve in Ter ~ "binding with the unit of Fig. 3 can be used,

13 shows a final diagram for the representation of the relief valve in the closed position,

Fig. 14 shows a similar representation of the relief valve in its open position and

Fig. 15 is a section through a "preferred flow indicator for use with the units shown in Figs.

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The invention is gßdacht for use in connection with a vehicle engine, as is for example shown in Figo 1 generally at 11 _o This motor can a truck or another vehicle a car park, a system vehicle, such as a handling device for pallets, a component .One Powering construction equipment, a bulldozer, or other construction equipment. The engine 11 is provided with a known crankcase oil pan 12 which has a drain hole 13 in its bottom into which a removable drain plug (not shown) is normally inserted, _{or the like}

In accordance with the invention, vehicle modification equipment as indicated generally at 14 is provided. This equipment, which is shown in detail in Figo 2, comprises an L-shaped oil pan connector 15 with a Connection to a connector 16 at one end of a Hose length 17. The other end of this hose carries a known self-sealing coupling half 18 »A suitable one Coupling is the self-sealing snap coupling of the 5600 series manufactured by Aeroquip Corporation, Jackson, Michigan, is made, a dust cap 19 is provided for this coupling half, which is through a Ring 21 and a chain 22 are connected to the coupling half »

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A bearing bracket is provided for fastening the coupling half 18 to a section 23 of the vehicle, such as "for example a bulkhead next to the dipstick 24-. This bracket can take various forms depending on the requirements. Such a bracket is" at 25 in I ¹ Xg. 1, while another type is shown in 27a in FIG gravity in the absence of evacuation equipment. The length of the hose 17 must of course bridge the distance between the drain opening 13 and the desired bearing point of the coupling half 18. The latter is directed upwards so that it is easily accessible to an operator who reaches into the engine housing, but is in any case substantially above the normal oil level in the crankcase.

According to the invention "the oil change is made by you connect a hose with a matching coupling half with the half 18, this hose to a Vacuum pump leads, which is connected to a storage tank for the old oil. The operator removes the dust

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cap 19, connects the coupling halves and starts the pump. This will quickly get all of the old oil out of the pan 12 a "bgesaugto the flow takes place" at an essentially constant Speed instead, so that mud and debris from the bottom of the pan are more easily removed from the crankcase can be considered "in the drainage process due to the Gravity, "at which the flow velocity Towards the end of the draining process, the coupling Half 18 is then connected to a second pump, which draws in new oil from a closed container »This Oil flows into the crankcase 12 without being exposed to the surrounding atmosphere, with the interior of the crankcase during the entire emptying and Refill cycle is also completed. Since the oil flows into the crankcase from the bottom, it is possible to read the oil level from the adjacent dipstick «, The device for emptying the old oil and filling in the new oil can take any shape »In Pig ο 3 becomes a combined emptying and filling unit shown. This unit is indicated generally at 26. For storing the unit in the rear of a truck or for stationary installation, a cabinet 27 is provided which has a first upper compartment 28 which contains a line 29 and a drain line 31, as well as a second upper compartment 32 for the battery 33, select

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A switchboard is arranged between these compartments o A first lower compartment 34 contains two gear pumps 35 and 36, while a second lower compartment contains an air-cooled gasoline engine 37. In the rear of the cabin a cylinder 38 for old oil and a cylinder 39 for new oil are arranged (Fig. T) ₉ and fastened by straps 41 «

When performing the method according to this invention using the pump unit 26, the oil cylinder connections are first established, as shown in FIG. In the upper part of the oil cylinder 39 for new oil, a suction valve probe 42 is inserted and the supply line 29 for the filling pump together with a return line 43 - connected to it by quick couplings 44 and 45, respectively. The cylinder 38 for old oil should be empty and a safety float 46 can be inserted in it and with the drain line 31 to be connected «. This arrangement shows on when the cylinder 38 is full and automatically interrupts the evacuation cycle to prevent the cylinder from overflowing for used oil to prevent,

The engine 37 can then be started by a starter switch 47 be, whereby the filling pump 36 via a centrifugal

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power clutch is driven. To control the motor, a throttle 48 and a choker 49 are provided; the Motor can be controlled via an electromagnetic clutch 50 Connect (Figo 4) to a drain pump 35 “The filling pump 36 has either a pressure relief valve or a bottom valve, which prevents the return of the oil into the Cylinder 39 is permitted for new oil via line 43 if it is not dispensed for pulling ”, Fig. 12 bis 14, which will be described in the following "show a suitable one Relief valve for this purpose. During this time "there is a pressure in the filling line 29" up to a filling measuring nozzle, which is also described below ο

The first step in changing the oil in a vehicle is draining the old oil from the crankcase of the Vehicle. The evacuation hose 31 can be removed from the compartment 28 and replaced by an appropriate one carried by the conduit Coupling half 51 can be connected to the free end of coupling half 18 on a vehicle »The dust cap 19 is of course removed for this purpose. The throttle 48 can then be opened and an act start button 52 be pushed down on the dashboard »This

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The lamp 53 lights up, indicating that the cycle is running, and the clutch 50 is energized to initiate the automatic drainage of the oil in the crankcase 12 via the fitting 14 and the hose 31 into the cylinder 38 for old oil. The excitation of the clutch 50 takes place by means of a time relay TR (Fig. 4), which can be set for a predetermined time delay, generally to about 15 to 20 seconds 4, for example model NT · FS4-3T3 manufactured by McDonnell & Miller Inc., Chicago, Illinois, '. When the oil begins to flow through the flow switch FS, the latter takes over the control of the electromagnetic clutch 50 in order to keep it engaged for the remainder of the emptying cycle. When all of the oil has been drained from the vehicle, air begins to flow upward in the evacuation hose 31. As soon as air flows through the flow container FS, this switch returns to its exhibition, whereby it interrupts the electrical circuit to the electromagnetic coupling 50 and thus brings the pump 35 to a standstill and the switch panel lamp 53 to go out _o The drain line 31 can then be from the Hose 17 are separated (Fig. 8) _β

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The filling line 29 is then removed from the compartment 28. A measuring nozzle 54 is attached to this line; a suitable unit "is the model Fr ₀ 635 364 sold by The Aro Corporation, Bryan, Ohio" This nozzle (Pig. 9) has a quick disconnect coupling half 55 which mates with coupling half 18. Compartment of connection the measuring nozzle with the installation 14, the measuring device of the measuring nozzle 54 is set to the correct amount of oil that the engine required the installation 14 to the crankcase. When the selected amount has been dispensed, the nozzle closes automatically, which means that the oil is again circulated through the line 43. The oil level should then be checked using the dipstick 24, the The measuring nozzle is separated and the dust cap is put back onto the coupling half 18 _o

The time required for emptying and filling varies with the amount and temperature of the oil The system can empty and fill six quarters of oil at room temperature in about 30 seconds can be completed in about 45 seconds at the same amount and temperature of the oil.

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Figures 5 and 6 show a pumping unit generally "at 201 ", which in its basic arrangement is similar to that of Pump unit 26 is "in which, however, the oil pumps instead driven by a gas engine from two electric motors The unit 201 has a cabinet 202 with a first upper compartment 203 which has a filling line 204 and a drain line 205 includes. The cabinet contains a drain pump 206 driven by an electric motor 207 is driven, as well as a flushing pump 208 which is driven by an electric motor 209 o The control panel the cabinet 202 is provided with a signal lamp 211, which responds when the power supply is switched on, as well as with an ignition key 212, a signal lamp 213, which indicates that the cycle is running, and a cycle start button '

In operation, the unit 201 operates in the same manner as the unit 26, apart from the fact that the relief valve mentioned above with reference to the unit 26 is replaced by a pressure switch PS (Pig. 6). This Switch responds to a pressure build-up in the oil line 204 in such a way that it switches off the motor 209 “If However, the measuring nozzle of line 204 is open and oil is dispensed, then the pressure drops, causing the engine to start.

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is left ₀ The reflux line 43 is not present in this embodiment.

10 shows a second embodiment of the pumping device with two pumping units shown generally at 56 and 57. These units are portable and will used for emptying and replenishing oil in a workshop, shipyard or dock where electrical Energy is available “In. Workshops that have an above arranged Ölfülläitung are equipped, only the emptying unit 56 is required, while in workplaces, that require both filling and emptying, both units are used.

Each unit includes a lank 58 that rides on two wheels 59 is stored and has tank drain plug 61 and oil level indicator 62 which indicate when the tank is full. Each unit is provided with an electric motor 63 mounted on its respective tank and a pump 64 drives, the inlet and outlet of which are provided with self-sealing couplings 65 “There is one for every motor electrical cable 66. provided “The unit 56 owns a drain hose 67 with a self-sealing coupling half 58 at the outer end, which is connected to the coupling

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treatment half 18 can be connected. Between the coupling half 68 and the tube 67, a flow indicator 69 is mounted that indicates the completion of the emptying cycle without the flow to untererechen _o A suitable design for such a display device is described below with reference to Pig. 15 »A removable suction strainer 71 is arranged on the pump side of the emptying hose to keep foreign bodies away from the gear pump and to be able to quickly determine at a glance whether there are any metal particles in the oil of the vehicle engine o The outlet opening of the emptying pump leads through a hose 72 to your tank 58.

The unit 57 is provided with a bill hose 73 which is equipped with a measuring nozzle 74, which can be adjusted so that it delivers the required amount of oil, the the outer end of this nozzle has a self-sealing coupling half 75 which can be connected to the coupling half. When the desired amount of oil has been dispensed, the nozzle closes automatically. The new oil flows out from the tank 58 of the unit 57 through a hose 76, the pump 64, the hose 73 and the measuring nozzle 74 to the Hose 17. The pump 64 has a built-in safety

at

valve open so that / closed nozzle the oil through the pump is circulated.

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In operation, the electrical cable 66 of the drain unit 56 is plugged into a connector and the drain line 67 connect with the hose 17 ,. The motor is started and the oil emptied until the display device 69 shows that the emptying cycle has ended o The electric motor is switched off and the emptying. line interrupted. A sample with the vehicle dipstick 24 confirms the emptying »

To fill in the new oil, the electrical cable 66 of the unit 57 is connected to a connector and her Electric motor 63 turned on. The MeßcLu.se 74 is on the set the amount of oil to be dispensed, and the self-tightening coupling half 75 is connected to the coupling half 18 present on the vehicle, pulling the release device on the measuring nozzle initiates the oil delivery, which is automatically interrupted when the correct amount has been handed in »

to return old oil from the tank 58 to the emptying unit 56 remove, when the indicator shows that the filling is almost complete, the drain plug 61 can be used. Optionally, the line connections to the inlet and outlet of the pump 64 can be made using the self-sealing

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the couplings on the pump are reversed »The coupling half 68 on the PüTleitung can then be opened by plugging in a suitable coupling half and the electric motor can be switched on to empty the tank 58

Pig. 11 shows an emptying system which is particularly suitable for lubrication vehicles such as those used to carry out scheduled lubrication in numerous vehicle fleets for construction equipment. These carriages carry tanks, as they are indicated for example at 77 in part to old oil collect _e The plant shown in Pig "11 is to be appropriately incorporated into such known Abschmierfahrzeuge" The installation comprises a Yenturi- or ejection valve 78 with a vacuum opening 79, which is connected via a line 81 to the upper end of the tank 77, a shut-off valve 82 and a check valve 83. The inlet opening 84 of the ejector 78 is via a hose Q ^ and a control valve 86 to a compressed air source (not shown) The upper section of the tank 77 is connected to a combined pressure and vacuum measuring device 87 and to a hose 88 which leads to a coupling half 89 which is able to form a pair with the coupling half 18 of the installation 14 . Between the coupling half 89 and the hose 88 is a

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Flow indicator 91 arranged

In operation, the valves 82 and 88 open so 'that the through the eject valve 78 to its outlet port 92 Compressed air flowing in the top of tank 77 creates a partial vacuum. The amount of vacuum that passes through the measuring device 87 is displayed can be controlled by changing the position of the valve 86. the Coupling half 89 can then be connected to coupling half 18 to remove the lubricating oil from the vehicle empty. After each vehicle evacuation, valve 86 can be closed to maintain air pressure while the check valve 83 maintains the vacuum in the tank.

To get the old oil from tank 77 when the tank is almost full remove, a bypass line 93 is provided between the line 85 and the valve 86, which is through a valve leads to the top of the tank 77. To remove the old oil. the valves 82 and 86 are closed and that Valve 94 opened to pressurize the tank. A drain valve 95 in the bottom of the tank 77 can then be opened to let the old oil flow out, after which the valve is closed.

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Figures 12, 13 and 14 show the construction and the Puncture a relief valve as referring to the filling line 29 of the unit 26 has been described. The valve is indicated generally at 101 and comprises a Cross-shaped G-housing 102 with intersecting bores 103 and 104β The bore 103 is with a first Threaded opening 105 for connection to the front side of the ! Filling pump 36 by means of a line 106 (Figs. 13 and 14) provided, and with an opening 107 for connection to a cylinder 39 for new oil by means of the return line 43. The bore 104 has a slide valve body 108 and a piston 109 arranged behind it. Bine cap 111 with a valve 112 at one end of the bore 104 a spring 113 urging the bodies 108 and 109 to the right with the piston 109 engaging a cap 114, which are connected to a control line 116 with an opening 115 istβ The other end of this control line is connected to line 29, with between the ΐ-connection 118 for the control line 116 and the T connection 119 for the line 106, a check valve 117 is switched on is. The valve 117 allows a flow only in the direction of T 118. The slide 108 is with an extension 121 provided, which limits its movement towards the cap, and the piston 109 has an elongation

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tion 122 on which it is spaced from the slide valve holds ο

During operation, when the measuring nozzle 54 is open, as in FIG. 3? 13, a relatively low pressure in the control line 116 is shown. The parts are therefore in the in Pig. 12 shown Position, i.e. the relief valve is't closed and there is no fluid flowing in the Fe be ns stream. If the measuring nozzle 54 closes, then the pressure build-up in the control line 116 causes the slide valve to move 108 to the left through the piston 109, creating the bore 103 is opened and the oil is circulated as shown in FIG.

Pig «15 shows a suitable plus indicator, such as them at 69 in Pig. 10 and at 91 in Fig. 11 showing the completion of the drainage of the old oil visually indicates. The unit is indicated generally at 123 and comprises a housing 124 with one indicated generally at 125 Drilling. This bore has a wider section 126 and a narrower section 127, these sections are by a frustoconical or diminished Section 128 interconnected. The bore

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section 1 26 is internally threaded, and the bore section 127 is externally threaded, so that the unit 123 can be connected to the drain line. On the outside of the housing 124 is a removed portion 129 is provided which extends radially outwardly from the bore portion 128 · In this recess is an indicator housing 131 of tubular Shape stored and extends from this radially outward, wherein it at its outer end with a inside shoulder 132 is provided ". It's an indicator button 133. This button has a piston portion 134 with an annular seal 135 »the is slidably supported in the housing 131. The button 133 is pressed outward by a spring 136 through the opening 137 formed on the inside of the shoulder 132. A radial channel 138 connects the frustoconical bore portion 128 with the chamber 139 within the body 131

In operation, the display button 133 is against the pressure of the Spring 136 retracted inwardly while oil flows in bore 125 in both directions (normally found the flow in the direction of arrow 141 instead). This is due to the effect of the partial vacuum that is caused by

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the pumping action was generated in the bore. If that all old oil has been removed from the crankcase, then air is drawn into the bore 125, and relatively high vacuum is lost. 'The spring 136 thus leads' the indicator 133 back to its position in which it was after protrudes outside, indicating that all of the oil has been removed.

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Claims (1)

Patent claims: / ί \ Method for carrying out an oil change in a vehicle with an oil pan, a trigger and a plug, characterized in that the plug is replaced by a connector which is located at one end of an oil change hose which has a self-tightening coupling half at its other end this other end is fastened above the normal oil level, the old oil is drained from the engine by connecting a drainage hose with a complementary coupling half to the oil change hose, the old oil is drawn from the pan into a container for old oil, the drainage hose is separated from the oil change hose, a filling hose with a complementary coupling half is connected to the oil change hose and the new oil is ^{pumped from a closed container via the I 1} UlIschlauch into the tub. 2. The method according to claim 1, for implementation in an engine with a dipstick and an oil pan with bottom drain , characterized in that a line from the bottom outlet to a self-sealing coupling half - 26 3 0 9839/0439 is closed, which is fastened in the area of the dipstick of the engine above the normal oil level, the old _{oil t is} withdrawn from the engine through a drain hose connected to the coupling half by means of a vacuum, the drain hose is disconnected and new oil is pumped into the engine from a closed container by pumping it through a filling hose connected to the coupling half, so that neither the inside of the oil pan nor the new oil is exposed to the surrounding atmosphere ₀ 3. Device for changing the oil in a machine with a Dipstick and a crankcase oil pan provided with a bottom drain opening, characterized by a Installation containing an oil change hose that is attached to a One end is provided with a connector mounted in the drainage opening and a self-sealing connector at the other end Coupling half, means for fastening the other end in the region of the motor above the normal Oil level, a container for old oil, a drain hose and pump equipment that goes with the Installation for drawing off the old oil from the pan in the container are connectable, a closed container for new oil as well as a filling hose and pumping devices that are used to deliver new oil from the closed - 27 30 9 839/0439 these containers can be connected to the tub with the installation, 4 ο combination according to claim 3 »characterized in that the self-sealing coupling half is a quick coupling and has a dust cap, while the storage facilities contain a bracket attached to a vehicle part near the engine dipstick. 5. Combination according to claim 3, characterized in that the emptying and Bille devices a cabinet in the Own areas of the oil container, drive means are stored in the cabinet and attached to the container for old or new oil connected emptying and filling pumps drive, as well as a drain hose connected to the drain pump and a filling hose connected to the filling pump is, the latter hoses having self-sealing coupling halves that are complementary are designed for the coupling half of the named installation, 6, combination according to claim 5, characterized in that the filling hose is provided with a measuring nozzle which is so can be adjusted so that they have a fixed oil - 28 - 309839/0439 dispenses and then the nozzle closes » ο Combination according to claim 5 »characterized in that the drive is an internal combustion engine mounted in the cabinet, and one between the engine and the filling pump Centrifugal clutch and an electromagnetic clutch arranged between the drive and the evacuation pump is, while Umwälzeinricntun'gen on the filling line are connected, which respond to a closure of the output end of the line in order to continue running the filling pump to circulate oil. " 8. Combination according to claim 7, 4a4 * ia? Efet characterized by a starter switch for energizing the electromagnetic clutch on the actuation of the starter switch appealing timer that energizes the electromagnetic clutch for a specified time holds, as well as a flow switch, which is responsive to a flow in the evacuation hose, to the electromagnetic Keep clutch energized after the timer has expired, this flow switch at Absence of a stream of old oil in the drain hose in such a way that he addresses the - 29 - 309839/04 3 9 electromagnetic clutch is de-energized _o 9. Combination according to claim 5, characterized in that the drive contains two electric motors for the Entleerungsbzw «the filling pump and one to the PUlIschlauch Pressure switch is connected, the pressure build-up in this hose at the closed output end of the hose responds in such a way that it drives the electric motor for 'the filling pump switches off and when opening this outlet end is responsive to a pressure drop such as to restart the engine. 10. The combination of claim 9, further characterized by a starter switch for the evacuation pump motor, a timer responsive to the energization of the starter switch which operates the last-mentioned engine for a given Keeps energized time, as well as a flow adjuster, which is connected to the drainage hose and responds to an oil flow therein in such a way that it maintains the excitation of the evacuation pump motor, after the timer has expired and responds to the absence of old oil in the drain hose by causing the drain pump motor de-excited. 09839/0439 11. Combination according to claim 3, characterized in that the container for old oil is a tank mounted on wheels, the drainage hose and pump equipment is a pump with an electric drive mounted on the tank "Form, a drainage hose is connected to the inlet of the pump, one of which leads to the coupling half of the installation having complementary self-sealing coupling halves, and means are present connecting the outlet of the pump to the tank » 12 »Combination according to claim 11, characterized in that the container for new oil is a tank mounted on wheels, the filling hose and pump device one on The tank-mounted pump with an electric drive with a filling hose connected to the outlet of the pump and a line for the inlet of the pump to the tank new oil connects. ο Combination according to claim 11, characterized by a Office flow indicator in the drain hose, which is responsive to a partial vacuum created as oil flows therethrough so as to indicate oil flow, and is responsive to a release of the vacuum after the old oil has been drained so as to terminate the drain to display. 3038 39/0439 14 · Combination according to claim 11, characterized by self-sealing quick couplings attached to the inlet and outlet of the evacuation pump are connected, and a drain plug on the tank for old oil, whereby old oil is removed from the tank by reversing the line connections at the pump inlet and pump outlet can be removed by inserting the coupling half at the outer end of the evacuation line suitable coupling half is opened and the drain pump is operated « 15o combination according to claim 11, characterized in that that the drain hose is also connected to it Flow indicator is provided, which responds to the completion of the emptying cycle and so indicates the end of the flow, and an oil level indicator is arranged on the tank for old oil « 16. Combination according to claim 11, characterized in that the pump is a gear pump and between the A suction strainer for the pump inlet and the drainage hose is arranged in a removable manner, which means that foreign objects are kept away from the gear pump, - 32 - 309839/0439 17o device for changing the lubricating oil in an engine with a dipstick and a crankcase oil pan that come with a bottom outlet opening is provided by a housing containing an oil change hose with a connector at one end that goes into the drain port is inserted, and with a self-sealing coupling half at the other end, as well as means for Attachment of this other end in the area of the 'engine above the normal oil level, a container for old oil, as well as a drainage hose and pump device that can be connected to the installation to remove the old Withdraw oil from the pan into the container «, 18o combination according to claim 17, characterized in that that the emptying hose and pump device has an ejector valve with a vacuum connection to the upper part of said old oil tank, as well as a line leading from a compressed air source through a control valve n leads to the inlet of the ejector valve, a measuring device connected to the upper portion of the tank to indicate a vacuum and an intake manifold connected to the upper portion of the tank and carries a self-sealing coupling half that is complementary to the coupling half of the - 33 309839/0439 baus is formed and can be connected to this, whereby opening the control valve creates a vacuum in the tank and draws old oil from the sump into the tank O 19. Combination naoh claim 18, characterized by a Check valve in the connection between the ejector valve and the tank, which maintains the vacuum in the tank, after the control valve has been switched off between vehicle evacuations « 2Q. Combination according to claim 18, characterized by a Bypass line between the compressed air supply line and the upper section of the tank, a first shut-off valve in the bypass line and a second shut-off valve in the connection between the ejector valve and the tank, which is provided with a bottom drain valve, whereby old oil can be squeezed out of the tank by closing the second shut-off valve and the first Shut-off valve and the drain valve opens. 309839/0439