GB2196692A - Removing and/or fitting I.C. engine valve springs - Google Patents

Removing and/or fitting I.C. engine valve springs Download PDF

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Publication number
GB2196692A
GB2196692A GB08621363A GB8621363A GB2196692A GB 2196692 A GB2196692 A GB 2196692A GB 08621363 A GB08621363 A GB 08621363A GB 8621363 A GB8621363 A GB 8621363A GB 2196692 A GB2196692 A GB 2196692A
Authority
GB
United Kingdom
Prior art keywords
valve
spring
fitting
fitment
engine
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.)
Withdrawn
Application number
GB08621363A
Other versions
GB8621363D0 (en
Inventor
Michael John James
John Howard Marsh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SERVICE CENTRE
Original Assignee
SERVICE CENTRE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SERVICE CENTRE filed Critical SERVICE CENTRE
Priority to GB08621363A priority Critical patent/GB2196692A/en
Publication of GB8621363D0 publication Critical patent/GB8621363D0/en
Publication of GB2196692A publication Critical patent/GB2196692A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
    • B23P19/04—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts
    • B23P19/042—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts specially adapted for combustion engines
    • B23P19/045—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for assembling or disassembling parts specially adapted for combustion engines for assembling valve cotters and retainers of engine valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/14—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same
    • B25B27/24—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for assembling objects other than by press fit or detaching same mounting or demounting valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
    • F01L1/46—Component parts, details, or accessories, not provided for in preceding subgroups
    • F01L1/462—Valve return spring arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00—Engines characterised by air compression and subsequent fuel addition
    • F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition

Abstract

A valve spring is adapted to be removed and/or fitted by pressurising a respective combustion chamber, with the engine at rest, sufficiently to retain the valve closed. This can be achieved by inserting a fitment into an entry which is exposed upon removal of a sparking plug or diesel injector, and then pressurising the combustion chamber from a pressure source, suitably an industrial airline, which is connected to the fitment.

Description

SPECIFICATION Removing and/or fitting engine valve springs This invention is expected to find its main application in the servicing of internal combusion engines, such as road vehicle, aero or marine engines, and in particular in the removal and/or fitting of valve springs in such engines.
Valve springs need to be removed for replacement, or to allow acess to valve stem oil seals. In an ordinary overhead-valve engine, such as a four-stroke petrol engine, the first step in removing a valve-spring is to remove the cylinder head from the cylinder block. A spring compressor in the form of a G-clamp is then applied to clamp across the cylinder head, longitudinally of the valve stem, between the valve head and the spring-abutting cap or washer which slides on the valve stem.
By means of this clamping action the spring, mounted on the stem and extending between the washer and the cylinder head, can be compressed to relieve a spring-retaining collar (or whatever other means is provided) secured in fixed position on the valve stem. With the collar relieved, both to take the spring load off it and to create clearance between it and the washer to provide easy access, the collar can then be removed from the stem. This permits removal of the spring, which in turn allows access to the valve stem oil seals. For reassembly the new spring has to be compressed to enable the collar to be replaced.
A very similar procedure has to be followed in side-valve engines in which the valves are seated in the cylinder block rather than the cylinder head. The cylinder head still needs to be removed to enable clamping of the spring and positive retention of the valve. In either case, were the spring simply to be compressed without removal of the cylinder head, and so without support for the valve head by the spring compressor, the retaining collar would not be held positively spaced from the depressed washer and the valve might be free to fall into the cylinder after removal of the collar.
It is an object of the present invention to provide an improved method of removing and/ or fitting a valve spring in an internal combustion engine which enables the job to be done more efficiently than hitherto.
The invention provides, in one of its aspects, a method of removing and/or fitting a valve spring in an internal combustion engine comprising pressurising the combustion chamber (with the engine at rest) sufficiently to retain the valve closed in the ordinary course of removing and/or fitting the valve spring.
The chamber may be pressurised with air from an ordinary industrial airline to a pressure of perhaps 150 p.s.i. Pressurisation can be effected through a sparking plug or diesel injector entry after removal of the plug or injector, and in another of its aspects the invention provides means for enabling pressurisation of the chamber in performance of the method set out in the last preceding paragraph comprising an air-conductive fitment adapted to be substituted directly for a sparking plug or other removable fitting in the chamber wall.
The fitment may itself comprise a non-return valve (for example, similar to a conventional tyre valve) or suitable valving may be provided associated with an airline attached, or adapted to be attached, to the fitment.
In a reciprocating engine, pressurisation of the cylinder should be effected with the piston in that cylinder at the bottom of its stroke.
In addition to its utility in spring and seal changing, pressurisation of the chamber could also be used to test for compression loss through leakage past the piston or otherwise from the cylinder.
By avoiding the need to remove the cylinder head (in the case of a reciprocating engine) substantial time can be saved in accordance with the invention, providing a substantially more efficient method of removing and/or fitting a valve spring. A range of fitments can be provided to suite different sparking plug standards and sizes used by different mass-produced vehicle manufacturers, a fitment having a mounting portion screw-threaded to the same standard and size, as a particular sparking plug, for direct substitution for the plug.
1. A method of removing and/or fitting a valve spring in an internal combustion engine comprising pressurising a respective combustion chamber (with the engine at rest) sufficiently to retain the valve closed in the ordinary course of removing and/or fitting the valve spring.
2. A method as claimed in claim 1, comprising the steps of removing a sparking plug or other removable fitting from an entry in the combusion chamber wall, securing a fitment at the exposed entry for connection with a source of pressurised fluid, and pressurising the combustion chamber from the source and through the fitment and entry to retain the valve closed.
3. Means for enabling pressurisation of a combustion chamber in performance of a method according to claim 2 comprising a fitment adapted to be substituted directly for a sparking plug or other removable fitting at an entry in the combustion chamber wall, the fitment when secured at the entry enabling pressurisation of the chamber through the fitment.
4. Means according to claim 3 in which the fitment is connected to a source of pressurised fluid.
5. Means according to either of claims 3 and 4 comprising a valve incorporated to pre
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Removing and/or fitting engine valve springs This invention is expected to find its main application in the servicing of internal combusion engines, such as road vehicle, aero or marine engines, and in particular in the removal and/or fitting of valve springs in such engines. Valve springs need to be removed for replacement, or to allow acess to valve stem oil seals. In an ordinary overhead-valve engine, such as a four-stroke petrol engine, the first step in removing a valve-spring is to remove the cylinder head from the cylinder block. A spring compressor in the form of a G-clamp is then applied to clamp across the cylinder head, longitudinally of the valve stem, between the valve head and the spring-abutting cap or washer which slides on the valve stem. By means of this clamping action the spring, mounted on the stem and extending between the washer and the cylinder head, can be compressed to relieve a spring-retaining collar (or whatever other means is provided) secured in fixed position on the valve stem. With the collar relieved, both to take the spring load off it and to create clearance between it and the washer to provide easy access, the collar can then be removed from the stem. This permits removal of the spring, which in turn allows access to the valve stem oil seals. For reassembly the new spring has to be compressed to enable the collar to be replaced. A very similar procedure has to be followed in side-valve engines in which the valves are seated in the cylinder block rather than the cylinder head. The cylinder head still needs to be removed to enable clamping of the spring and positive retention of the valve. In either case, were the spring simply to be compressed without removal of the cylinder head, and so without support for the valve head by the spring compressor, the retaining collar would not be held positively spaced from the depressed washer and the valve might be free to fall into the cylinder after removal of the collar. It is an object of the present invention to provide an improved method of removing and/ or fitting a valve spring in an internal combustion engine which enables the job to be done more efficiently than hitherto. The invention provides, in one of its aspects, a method of removing and/or fitting a valve spring in an internal combustion engine comprising pressurising the combustion chamber (with the engine at rest) sufficiently to retain the valve closed in the ordinary course of removing and/or fitting the valve spring. The chamber may be pressurised with air from an ordinary industrial airline to a pressure of perhaps 150 p.s.i. Pressurisation can be effected through a sparking plug or diesel injector entry after removal of the plug or injector, and in another of its aspects the invention provides means for enabling pressurisation of the chamber in performance of the method set out in the last preceding paragraph comprising an air-conductive fitment adapted to be substituted directly for a sparking plug or other removable fitting in the chamber wall. The fitment may itself comprise a non-return valve (for example, similar to a conventional tyre valve) or suitable valving may be provided associated with an airline attached, or adapted to be attached, to the fitment. In a reciprocating engine, pressurisation of the cylinder should be effected with the piston in that cylinder at the bottom of its stroke. In addition to its utility in spring and seal changing, pressurisation of the chamber could also be used to test for compression loss through leakage past the piston or otherwise from the cylinder. By avoiding the need to remove the cylinder head (in the case of a reciprocating engine) substantial time can be saved in accordance with the invention, providing a substantially more efficient method of removing and/or fitting a valve spring. A range of fitments can be provided to suite different sparking plug standards and sizes used by different mass-produced vehicle manufacturers, a fitment having a mounting portion screw-threaded to the same standard and size, as a particular sparking plug, for direct substitution for the plug. CLAIMS
1. A method of removing and/or fitting a valve spring in an internal combustion engine comprising pressurising a respective combustion chamber (with the engine at rest) sufficiently to retain the valve closed in the ordinary course of removing and/or fitting the valve spring.
2. A method as claimed in claim 1, comprising the steps of removing a sparking plug or other removable fitting from an entry in the combusion chamber wall, securing a fitment at the exposed entry for connection with a source of pressurised fluid, and pressurising the combustion chamber from the source and through the fitment and entry to retain the valve closed.
3. Means for enabling pressurisation of a combustion chamber in performance of a method according to claim 2 comprising a fitment adapted to be substituted directly for a sparking plug or other removable fitting at an entry in the combustion chamber wall, the fitment when secured at the entry enabling pressurisation of the chamber through the fitment.
4. Means according to claim 3 in which the fitment is connected to a source of pressurised fluid.
5. Means according to either of claims 3 and 4 comprising a valve incorporated to pre vent reverse flow during pressurisation of the chamber.
6. Means according to claim 5 in which the fitment comprises a non-return valve.
7. A method of removing and/or fitting a valve spring in an internal combustion engine substantially as described herein.
8. Means for use in removing and/or fitting a valve spring in an internal combustion engine substantially as described herein.
GB08621363A 1986-09-04 1986-09-04 Removing and/or fitting I.C. engine valve springs Withdrawn GB2196692A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08621363A GB2196692A (en) 1986-09-04 1986-09-04 Removing and/or fitting I.C. engine valve springs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08621363A GB2196692A (en) 1986-09-04 1986-09-04 Removing and/or fitting I.C. engine valve springs

Publications (2)

Publication Number Publication Date
GB8621363D0 GB8621363D0 (en) 1986-10-15
GB2196692A true GB2196692A (en) 1988-05-05

Family

ID=10603681

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08621363A Withdrawn GB2196692A (en) 1986-09-04 1986-09-04 Removing and/or fitting I.C. engine valve springs

Country Status (1)

Country Link
GB (1) GB2196692A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993018892A1 (en) * 1992-03-20 1993-09-30 Brice Harmand Apparatus and method for facilitating assembly/disassembly of engine valves
GB2324264A (en) * 1997-04-18 1998-10-21 Linden Jarvis Valve support tool

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB611128A (en) * 1946-04-20 1948-10-26 Neil Smith Mcgowan Device for use in the cylinders of internal combustion engines for testing and the repair of parts thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB611128A (en) * 1946-04-20 1948-10-26 Neil Smith Mcgowan Device for use in the cylinders of internal combustion engines for testing and the repair of parts thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993018892A1 (en) * 1992-03-20 1993-09-30 Brice Harmand Apparatus and method for facilitating assembly/disassembly of engine valves
US5327630A (en) * 1992-03-20 1994-07-12 Brice Harmand Apparatus for facilitating removal/replacement of springs of engine valves
GB2324264A (en) * 1997-04-18 1998-10-21 Linden Jarvis Valve support tool

Also Published As

Publication number Publication date
GB8621363D0 (en) 1986-10-15

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)