How to remove and reinstall the Intake Valve, Valve Spring and Valve Stem Seal on Mazda 626?

The removal of the rocker arm assembly would begin with the removal of the rocker arm assembly then the cylinder head. Then compress the valve springs using a compressor and take out the valve keepers. Once the compressor is released, remove the seat, and springs and remove the valve stem oil seal with pliers. Take out the valves and store them in a numbered rack or a piece of cardboard to be able to install them back correctly. To install, slide the new valve stem oil seals in place in the guides, and fit them with a fit socket and hammer to snugly fit. Apply clean engine oil to the first valve stem and slide it into a guide that is its original, and do the same to the other ones. Lastly, fit the valve springs and seats, where a valve spring compressor is used to fix the keepers, and the cylinder head and rocker arm assembly is then re-fitted.

Can broken Valve Spring, Valve Spring Retainer and Valve Stem Seal be replaced without removing the cylinder head on Mazda Protege?

Replacement of broken valve springs and faulty valve stem seals can be done without the necessity to remove the cylinder head, and usually necessitates two special tools and a source of compressed air. In case of non availability of compressed air a piece of nylon rope may be employed to ensure the valves do not fall into the cylinder. Start by taking the camshaft(s) and valve lifters off the faulty valves, and store the lifters in the correct sequence so to re-fit. Take off spark plug of the affected cylinder and in case all the valve stem seals are to be replaced remove all spark plugs. Turn the crankshaft (referred to as crankshaft revolution) until the piston in the damaged cylinder reaches Top Dead Center during the compression stroke, and then move on to the next cylinder in the firing order. Insert an adapter into the spark plug hole and fit an air hose with a compressed air source and spray the compressed air to make the valves stay put. When it is nylon rope, the piston should be positioned at about 45 degrees before TDC, and the rope inserted into the combustion chamber and turned until slight resistance is felt. Insert stuffy shop rags in any holes on the cylinder head to ensure that parts do not fall in the engine and then compress the spring with a valve spring compressor to take out the keepers. Installation: Take out the spring retainer and valve spring with a mark on the upper end of the valve spring. Measure the depth till the upper side of the valve stem oil seal and strip. Tape or wrap a rubber band round the top of the valve stem to ensure that the stem does not fall off and then remove the air pressure. Check the valve spring and stem, and there must be none bound in the guide. Repeat air pressure to hold the valve in the closed position, and lubricate the value stem, and place a new oil seal, taking depth of installed as needed. Install the spring on the top of the valve making sure that it is placed properly and the valve spring retainer goes on and the spring is compressed to install the keepers. Take the spring tool off the pressure, making sure that the keepers are in place and the air hose is disconnected and the adapter removed. Lastly, install the camshaft(s) and the other components in the reverse order and start the engine to determine the presence of oil leakages or abnormal noises.

Genuine Mazda Valve Stem Seal

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22 Valve Stem Seals found

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Mazda Valve Seals Part Number: KL02-10-155
$9.73 MSRP: $12.97
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Product Specifications
- Other Name: Seal, Valve; Valve Seal
Fits the following Mazda Models:
- 323 | 1988-1989 | GT, GTX | 4 Cyl 1.6 L GAS
- 626 | 1993-2002 | DX, ES, LX | 4 Cyl 2.0 L GAS, 6 Cyl 2.5 L GAS
- 929 | 1990-1995 | Base, S | 6 Cyl 3.0 L GAS
- Miata | 1999-2005, 1990-1997 | 10th Anniversary, Base, LE, LS, M Edition, Mazdaspeed, SE, STO, Shinsen | 4 Cyl 1.6 L GAS, 4 Cyl 1.8 L GAS
- Millenia | 1995-2002 | Base, L, Millennium Edition, S | 6 Cyl 2.3 L GAS, 6 Cyl 2.5 L GAS
- MX-3 | 1992-1995 | Base, GS, Precedia, SE | 4 Cyl 1.6 L GAS, 6 Cyl 1.8 L GAS
- MX-6 | 1993-1997 | Base, LS, M Edition | 4 Cyl 2.0 L GAS, 6 Cyl 2.5 L GAS
- Protege | 1990-2003 | 4WD, Base, DX, ES, LX, MP3, Mazdaspeed, SE | 4 Cyl 1.6 L GAS, 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
- Protege5 | 2002-2003 | Base | 4 Cyl 2.0 L GAS
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Mazda Valve Seals Part Number: L807-10-155
$3.75 MSRP: $5.00
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Product Specifications
- Other Name: Seal, Valve Qty 1=1; Valve Seal
- Replaces: LF01-10-155, 1F20-10-155, 1F20-10-155A
Fits the following Mazda Models:
- 2 | 2011-2014 | Sport, Touring | 4 Cyl 1.5 L GAS
- 3 | 2004-2013 | Mazdaspeed, S, SP23, i | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
- 5 | 2012-2015, 2006-2010 | Grand Touring, Sport, Touring | 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
- 6 | 2003-2013 | Mazdaspeed, i | 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
- B2300 | 2001-2009 | Base, SE, SX | 4 Cyl 2.3 L GAS
- CX-7 | 2010-2012 | SV, Sport, Touring | 4 Cyl 2.5 L GAS
- MX-5 Miata | 2006-2015 | 25th Anniversary Edition, Base, Club, Club Spec, Grand Touring, SV, Special Edition, Sport, Touring | 4 Cyl 2.0 L GAS
- Tribute | 2008-2011 | Hybrid, i | 4 Cyl 2.3 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.5 L GAS
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Mazda Valve Seals Part Number: PE01-10-1F5
$3.93 MSRP: $5.23
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Product Specifications
- Other Name: Seal, Exhaust Valve; Valve Seal
- Replaces: PEDD-10-1F5
Fits the following Mazda Models:
- 3 | 2012-2024 | 2.0, 2.5 Carbon Turbo, 2.5 S, 2.5 Turbo, 2.5 Turbo Premium Plus, Base, Carbon Edition, Grand Touring, I Sport, I Touring, Preferred, Premium, Select, Select Sport, Sport, Touring, i, i Grand Touring, i SV, s Grand Touring, s Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
- 6 | 2014-2021 | Grand Touring, Sport, Touring | 4 Cyl 2.5 L GAS
- CX-3 | 2016-2020 | Grand Touring, Sport, Touring | 4 Cyl 2.0 L GAS
- CX-30 | 2020-2024 | 2.5 S, 2.5 S Carbon Edition, Base, Preferred, Premium, Select | 4 Cyl 2.5 L GAS
- CX-5 | 2013-2024 | 2.5 S, 2.5 S Carbon Edition, Carbon Edition, Grand Select, Grand Touring, Sport, Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
- CX-50 | 2023-2025 | 2.5 S | 4 Cyl 2.5 L GAS
- CX-70 | 2025 | PHEV | 4 Cyl 2.5 L PLUG-IN HYBRID EV-GAS (PHEV)
- CX-90 | 2024-2025 | PHEV | 4 Cyl 2.5 L PLUG-IN HYBRID EV-GAS (PHEV)
- MX-5 Miata | 2016-2024 | 100th Anniversary Special Edition, Club, Grand Touring, RF 100th Anniversary Special Edition, RF Club, RF GT, RF Grand Touring, Sport | 4 Cyl 2.0 L GAS
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Mazda Valve Seals Part Number: PY8W-10-1F5
$1.04 MSRP: $1.39
You Save: $0.35 (26%)
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Product Specifications
- Other Name: Seal, Exhaust Valve; Valve Seal
Fits the following Mazda Models:
- CX-30 | 2023-2024 | 2.5 Carbon Turbo, 2.5 Turbo | 4 Cyl 2.5 L GAS
- CX-5 | 2022-2024 | 2.5 Turbo, 2.5 Turbo Signature | 4 Cyl 2.5 L GAS
- CX-50 | 2023-2025 | 2.5 Turbo | 4 Cyl 2.5 L GAS
- CX-9 | 2016-2023 | Carbon Edition, Grand Touring, Signature, Sport, Touring, Touring Plus | 4 Cyl 2.5 L GAS
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Mazda Valve Seals Part Number: SH01-10-155
$4.71 MSRP: $6.29
You Save: $1.58 (26%)
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Product Specifications
- Other Name: Seal, Valve; Valve Seal
Fits the following Mazda Models:
- 3 | 2021-2024 | 2.5 Carbon Turbo, 2.5 Turbo, 2.5 Turbo Premium Plus | 4 Cyl 2.5 L GAS
- 6 | 2018-2021 | Carbon Edition, Grand Touring, Grand Touring Reserve, Signature | 4 Cyl 2.5 L GAS
- CX-30 | 2021-2024 | 2.5 Carbon Turbo, 2.5 Turbo | 4 Cyl 2.5 L GAS
- CX-5 | 2019-2024 | 2.5 Turbo, 2.5 Turbo Signature, Carbon Edition Turbo, Grand Touring Reserve, Signature | 4 Cyl 2.2 L DIESEL, 4 Cyl 2.5 L GAS
- CX-50 | 2023-2025 | 2.5 Turbo | 4 Cyl 2.5 L GAS
- CX-9 | 2016-2023 | Carbon Edition, Grand Touring, Signature, Sport, Touring, Touring Plus | 4 Cyl 2.5 L GAS
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Mazda Valve Seals Part Number: SH09-10-1F5A
$5.51 MSRP: $7.36
You Save: $1.85 (26%)
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Product Specifications
- Other Name: Seal, Exhaust Valve; Valve Seal
Fits the following Mazda Models:
- 3 | 2021-2024 | 2.5 Carbon Turbo, 2.5 Turbo, 2.5 Turbo Premium Plus | 4 Cyl 2.5 L GAS
- 6 | 2018-2021 | Carbon Edition, Grand Touring, Grand Touring Reserve, Signature | 4 Cyl 2.5 L GAS
- CX-30 | 2021-2022 | 2.5 Turbo | 4 Cyl 2.5 L GAS
- CX-5 | 2019-2021 | Carbon Edition Turbo, Grand Touring Reserve, Signature | 4 Cyl 2.2 L DIESEL, 4 Cyl 2.5 L GAS
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Mazda Valve Seals Part Number: 1F04-10-155
$2.73 MSRP: $3.63
You Save: $0.90 (25%)
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Product Specifications
- Other Name: Seal, Valve; Valve Seal
Fits the following Mazda Models:
- B3000 | 2001-2007 | Base, DS, SE | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
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Mazda Valve Seals Part Number: 1F01-10-155
$2.75 MSRP: $3.66
You Save: $0.91 (25%)
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Product Specifications
- Other Name: Seal, Exhaust Valve; Valve Seal
Fits the following Mazda Models:
- B3000 | 2001-2007 | Base, DS, SE | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
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Mazda Valve Seals Part Number: KL01-10-155
$12.00 MSRP: $16.00
You Save: $4.00 (25%)
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Product Specifications
- Other Name: Seal, Valve; Valve Seal
Fits the following Mazda Models:
- 626 | 1993-2002 | DX, ES, LX | 4 Cyl 2.0 L GAS, 6 Cyl 2.5 L GAS
- Miata | 1999-2005, 1994-1997 | 10th Anniversary, Base, LS, M Edition, Mazdaspeed, SE, STO, Shinsen | 4 Cyl 1.8 L GAS
- Millenia | 1995-2002 | Base, L, Millennium Edition, S | 6 Cyl 2.3 L GAS, 6 Cyl 2.5 L GAS
- MX-3 | 1992-1995 | Base, GS, Precedia, SE | 4 Cyl 1.6 L GAS, 6 Cyl 1.8 L GAS
- MX-6 | 1993-1997 | Base, LS, M Edition | 4 Cyl 2.0 L GAS, 6 Cyl 2.5 L GAS
- Protege | 1994-2003 | Base, DX, ES, LX, MP3, Mazdaspeed | 4 Cyl 1.6 L GAS, 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
- Protege5 | 2002-2003 | Base | 4 Cyl 2.0 L GAS
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Mazda Valve Seals Part Number: LF01-10-1F5
$6.16 MSRP: $8.23
You Save: $2.07 (26%)
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Product Specifications
- Other Name: Seal, Valve Qty 1=8Pcs; Valve Seal
- Replaces: 1F23-10-155A, 1F23-10-155
Fits the following Mazda Models:
- 2 | 2011-2014 | Sport, Touring | 4 Cyl 1.5 L GAS
- 3 | 2004-2013 | Mazdaspeed, S, SP23, i | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
- 5 | 2012-2015, 2006-2010 | Grand Touring, Sport, Touring | 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
- 6 | 2003-2013 | Mazdaspeed, i | 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L GAS
- B2300 | 2001-2009 | Base, SE, SX | 4 Cyl 2.3 L GAS
- CX-7 | 2010-2012 | SV, Sport, Touring | 4 Cyl 2.5 L GAS
- MX-5 Miata | 2006-2015 | 25th Anniversary Edition, Base, Club, Club Spec, Grand Touring, SV, Special Edition, Sport, Touring | 4 Cyl 2.0 L GAS
- Tribute | 2008-2011 | Hybrid, i | 4 Cyl 2.3 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.3 L GAS, 4 Cyl 2.5 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 2.5 L GAS
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Mazda Valve Seals Part Number: ZZJ1-10-155B
$3.16 MSRP: $4.21
You Save: $1.05 (25%)
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Product Specifications
- Other Name: Seal, Valve 1 = 1; Valve Seal
- Replaces: CY01-10-155A, CY01-10-155, ZZJ1-10-155
Fits the following Mazda Models:
- 6 | 2009-2013 | S | 6 Cyl 3.7 L GAS
- CX-9 | 2007-2015 | Grand Touring, Sport, Touring | 6 Cyl 3.5 L GAS, 6 Cyl 3.7 L GAS
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Mazda Valve Seals Part Number: L3K9-10-155A
$5.53 MSRP: $7.37
You Save: $1.84 (25%)
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Product Specifications
- Other Name: Seal, Valve; Valve Seal
- Replaces: L3K9-10-155
Fits the following Mazda Models:
- 3 | 2007-2013 | Mazdaspeed | 4 Cyl 2.3 L GAS
- 6 | 2006-2007 | Mazdaspeed | 4 Cyl 2.3 L GAS
- CX-7 | 2007-2012 | Grand Touring, Sport, Touring | 4 Cyl 2.3 L GAS
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Mazda Valve Seals Part Number: PE01-10-155
$3.99 MSRP: $5.32
You Save: $1.33 (25%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Seal, Valve; Valve Seal
- Replaces: PEDD-10-155
Fits the following Mazda Models:
- 3 | 2012-2024 | 2.0, 2.5 Carbon Turbo, 2.5 S, 2.5 Turbo, 2.5 Turbo Premium Plus, Base, Carbon Edition, Grand Touring, I Sport, I Touring, Preferred, Premium, Select, Select Sport, Sport, Touring, i, i Grand Touring, i SV, s Grand Touring, s Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
- 6 | 2014-2021 | Grand Touring, Sport, Touring | 4 Cyl 2.5 L GAS
- CX-3 | 2016-2020 | Grand Touring, Sport, Touring | 4 Cyl 2.0 L GAS
- CX-30 | 2020-2024 | 2.5 S, 2.5 S Carbon Edition, Base, Preferred, Premium, Select | 4 Cyl 2.5 L GAS
- CX-5 | 2013-2024 | 2.5 S, 2.5 S Carbon Edition, Carbon Edition, Grand Select, Grand Touring, Sport, Touring | 4 Cyl 2.0 L GAS, 4 Cyl 2.5 L GAS
- CX-50 | 2023-2025 | 2.5 S | 4 Cyl 2.5 L GAS
- CX-70 | 2025 | PHEV | 4 Cyl 2.5 L PLUG-IN HYBRID EV-GAS (PHEV)
- CX-90 | 2024-2025 | PHEV | 4 Cyl 2.5 L PLUG-IN HYBRID EV-GAS (PHEV)
- MX-5 Miata | 2016-2024 | 100th Anniversary Special Edition, Club, Grand Touring, RF 100th Anniversary Special Edition, RF Club, RF GT, RF Grand Touring, Sport | 4 Cyl 2.0 L GAS
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Mazda Valve Seals Part Number: AJ03-10-155
$2.05 MSRP: $2.73
You Save: $0.68 (25%)
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Product Specifications
- Other Name: Seal, Valve; Valve Seal
- Replaces: GY01-10-155
Fits the following Mazda Models:
- 6 | 2003-2008 | S | 6 Cyl 3.0 L GAS
- MPV | 2000-2006 | DX, ES, LX, LX-SV | 6 Cyl 2.5 L GAS, 6 Cyl 3.0 L GAS
- Tribute | 2008-2011, 2001-2006 | DX, ES, LX, S | 6 Cyl 3.0 L FLEX, 6 Cyl 3.0 L GAS
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Mazda Valve Seals Part Number: HE19-10-155
$11.09 MSRP: $14.78
You Save: $3.69 (25%)
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Product Specifications
- Other Name: Seal, Valve; Valve Seal
Fits the following Mazda Models:
- 626 | 1984-1987 | DX, GT, LX | 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
- 929 | 1988-1991 | Base, S | 6 Cyl 3.0 L GAS
- B2000 | 1986-1987 | Base, LX, SE-5 | 4 Cyl 2.0 L GAS
- B2200 | 1987-1993 | Base, LE-5, LX, SE-5 | 4 Cyl 2.2 L GAS
- GLC | 1984-1985 | Base, DX, LX | 4 Cyl 1.5 L GAS
- MPV | 1989-1998 | Cargo, DX, ES, L, LX, LXE, Passenger | 6 Cyl 3.0 L GAS
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Mazda Valve Seals Part Number: L3K9-10-1F5A
$7.05 MSRP: $9.40
You Save: $2.35 (25%)
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Product Specifications
- Other Name: Seal, Exhaust Valve; Valve Seal
- Replaces: L3K9-10-1F5
Fits the following Mazda Models:
- 3 | 2007-2013 | Mazdaspeed | 4 Cyl 2.3 L GAS
- 6 | 2006-2007 | Mazdaspeed | 4 Cyl 2.3 L GAS
- CX-7 | 2007-2012 | Grand Touring, Sport, Touring | 4 Cyl 2.3 L GAS
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Mazda Valve Seals Part Number: B630-10-155
$9.16 MSRP: $12.22
You Save: $3.06 (26%)
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Product Specifications
- Other Name: Seal, Valve; Valve Seal
Fits the following Mazda Models:
- 323 | 1991-1994, 1986 | Base, SE | 4 Cyl 1.6 L GAS
- 626 | 1988-1992 | DX, GT, LE, LX, Turbo, Turbo 4WS | 4 Cyl 2.2 L GAS
- 929 | 1988-1991 | Base, S | 6 Cyl 3.0 L GAS
- B2600 | 1989-1993 | Base, LE-5, LX, SE-5 | 4 Cyl 2.6 L GAS
- MPV | 1989-1998 | Cargo, DX, ES, L, LX, LXE, Passenger | 4 Cyl 2.6 L GAS, 6 Cyl 3.0 L GAS
- MX-6 | 1988-1992 | DX, GT, GT 4WS, LE, LX | 4 Cyl 2.2 L GAS
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Mazda Seal, Exhaust Valve Part Number: CWJ1-10-1F5
$22.53 MSRP: $30.05
You Save: $7.52 (26%)
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Product Specifications
- Other Name: SEAL,EXHAUST VALVE; Valve Seal
Fits the following Mazda Models:
- CX-50 | 2025
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Mazda Valve Seals Part Number: 1F22-10-155
$3.28 MSRP: $4.36
You Save: $1.08 (25%)
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Product Specifications
- Other Name: Seal, Valve; Valve Seal
Fits the following Mazda Models:
- B4000 | 2001-2009 | Base, DS, SE | 6 Cyl 4.0 L GAS
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Mazda Valve Seals Part Number: YF09-10-155
$3.91 MSRP: $5.21
You Save: $1.30 (25%)
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Product Specifications
- Other Name: Seal, Valve; Valve Seal
Fits the following Mazda Models:
- Tribute | 2001-2004 | DX | 4 Cyl 2.0 L GAS

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1-20 of 22 Results

Mazda Valve Stem Seal

Mazda Valve Stem Seal stops excess oil from entering the combustion chamber, which protects engine performance and reduces blue smoke. Mazda started building cars in 1931 and became famous in the 1960s with their sprightly rotary engine and that love of dynamic motoring lives on in every car. Today Mazda combines SKYACTIV engines and transmissions with KODO Soul of Motion design to produce cars that look good and are fuel-wise. The i-ACTIVSENSE features such as radar cruise and lane keeping give you peace of mind and i-ACTIV AWD gives you surefooted handling on rough roads. By introducing electric drive and mild hybrid technology, Mazda continues to pursue efficiency without sacrificing its fun-to-drive edge. The Valve Stem Seal sits on the valve guide and measures out just enough lubricant to coat the stem but will block out excess oil that will burn. Built with heat-resistant elastomer, a precise wiping lip and a small garter spring, it maintains a high level of compression and minimal emissions across the entire Mazda range. A positive-type design keeps the seal in place so the pressure pulses don't push oil up and cause carbon deposits and damage to the catalytic converter. When intact, the Valve Stem Seal ensures smooth idle and steady power and reduced oil consumption, adding to Mazda reliability mile after mile.

You'll get great performance and real durability when you pick genuine OEM Valve Stem Seal. Mazda builds these using high-quality materials and official factory methods to ensure they hold up mile after mile. You deserve that Mazda reliability without the headache of cheap knockoffs. It is easy to find exactly what you need in our huge inventory of genuine parts. Plus, every OEM part carries a real manufacturer's warranty for your peace of mind. You will love our low prices too. Order today and we will ship your brand-new parts fast. They often reach your door in just a few days.

Mazda Valve Stem Seal Parts and Q&A

Valve Seals
B630-10-155
Q:
How to remove and reinstall the Intake Valve, Valve Spring and Valve Stem Seal on Mazda 626?
A:
The removal of the rocker arm assembly would begin with the removal of the rocker arm assembly then the cylinder head. Then compress the valve springs using a compressor and take out the valve keepers. Once the compressor is released, remove the seat, and springs and remove the valve stem oil seal with pliers. Take out the valves and store them in a numbered rack or a piece of cardboard to be able to install them back correctly. To install, slide the new valve stem oil seals in place in the guides, and fit them with a fit socket and hammer to snugly fit. Apply clean engine oil to the first valve stem and slide it into a guide that is its original, and do the same to the other ones. Lastly, fit the valve springs and seats, where a valve spring compressor is used to fix the keepers, and the cylinder head and rocker arm assembly is then re-fitted.
Valve Seals
Z501-10-155
Q:
Can broken Valve Spring, Valve Spring Retainer and Valve Stem Seal be replaced without removing the cylinder head on Mazda Protege?
A:
Replacement of broken valve springs and faulty valve stem seals can be done without the necessity to remove the cylinder head, and usually necessitates two special tools and a source of compressed air. In case of non availability of compressed air a piece of nylon rope may be employed to ensure the valves do not fall into the cylinder. Start by taking the camshaft(s) and valve lifters off the faulty valves, and store the lifters in the correct sequence so to re-fit. Take off spark plug of the affected cylinder and in case all the valve stem seals are to be replaced remove all spark plugs. Turn the crankshaft (referred to as crankshaft revolution) until the piston in the damaged cylinder reaches Top Dead Center during the compression stroke, and then move on to the next cylinder in the firing order. Insert an adapter into the spark plug hole and fit an air hose with a compressed air source and spray the compressed air to make the valves stay put. When it is nylon rope, the piston should be positioned at about 45 degrees before TDC, and the rope inserted into the combustion chamber and turned until slight resistance is felt. Insert stuffy shop rags in any holes on the cylinder head to ensure that parts do not fall in the engine and then compress the spring with a valve spring compressor to take out the keepers. Installation: Take out the spring retainer and valve spring with a mark on the upper end of the valve spring. Measure the depth till the upper side of the valve stem oil seal and strip. Tape or wrap a rubber band round the top of the valve stem to ensure that the stem does not fall off and then remove the air pressure. Check the valve spring and stem, and there must be none bound in the guide. Repeat air pressure to hold the valve in the closed position, and lubricate the value stem, and place a new oil seal, taking depth of installed as needed. Install the spring on the top of the valve making sure that it is placed properly and the valve spring retainer goes on and the spring is compressed to install the keepers. Take the spring tool off the pressure, making sure that the keepers are in place and the air hose is disconnected and the adapter removed. Lastly, install the camshaft(s) and the other components in the reverse order and start the engine to determine the presence of oil leakages or abnormal noises.