Can a broken Valve Spring, a damaged Valve Spring Retainer and a defective Valve Stem Seal be replaced without removing the cylinder heads on Mitsubishi Montero?

Replacement of broken valve springs and defective valve stem seals can occur without the need to take off the cylinder heads. This usually requires two special tools and an air supply. When compressed air is unavailable, a length of nylon rope may prevent the valves from falling into the cylinder. To start, the valve cover of the cylinder head in question has to be removed. If all valve stem seals are being replaced then both covers. Then, take out the spark plug from the cylinder having the defective component and turn the crank shaft until the piston reaches its top dead center on the compression stroke. An air hose from a compressed air source should be connected to an adapter screwed into the plug hole. Once you have removed the rocker and the shafts, blast air into the cylinder. The air pressure will hold the valves in their place. A method can also be used whereby the air pressure is not activated. In this case, the piston can be placed just before TDC, and nylon rope can be fed manually into the combustion chamber. Tightly stuff shop rags in the cylinder head holes so that nothing falls down into the engine. Then use a valve spring compressor to compress the spring and remove the keepers. After removing the spring retainer, shield, valve spring, and guide seal, wrap a rubber band or tape around the valve stem, so it does not fall into the combustion chamber when you release the air pressure. Examine the valve stem for damage, and check if it can move freely in the guide. To keep the valve closed, air pressure is reapplied. The valve stem will be lubricated using engine oil, and the new guide seal will be installed. Place spring over valve and install spring retainer. Next, compress spring and carefully position the keepers. Use grease to hold the keepers in position. Once the keepers are seated, remove the air hose, adapter, place the spark plugs and reconnect the wires. In conclusion, engage the engine and observe for any oil leakage or the occurrence of odd noises.

Genuine Mitsubishi Valve Stem Seal

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10 Valve Stem Seals found

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Mitsubishi Valve Seals Yellow Part Number: MD307342
$4.80 MSRP: $6.25
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Product Specifications
- Other Name: Seal, Exhaust Valve Stem; Valve Stem Oil Seal; Valve Stem Seal
Fits the following Mitsubishi Models:
- Diamante | 1997-2004 | Base, ES, LS, VR-X | 6 Cyl 3.5 L GAS
- Eclipse | 2000-2012, 1995 | GS, GT, GTS, RS, SE, Spyder GT, Spyder GTS | 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.8 L GAS
- Endeavor | 2010-2011, 2004-2008 | LS, Limited, SE, XLS | 6 Cyl 3.8 L GAS
- Galant | 1999-2009 | ES, GTS, GTZ, LS, Ralliart, Sport V6 | 6 Cyl 3.0 L GAS, 6 Cyl 3.8 L GAS
- Montero | 1995-2006 | Base, LS, Limited, SR, XLS | 6 Cyl 3.0 L GAS, 6 Cyl 3.5 L GAS, 6 Cyl 3.8 L GAS
- Montero Sport | 1997-2004 | ES, LS, Limited, XLS, XS | 6 Cyl 3.0 L GAS, 6 Cyl 3.5 L GAS
- Outlander | 2007-2020 | ES, GT, LS, XLS | 6 Cyl 3.0 L GAS
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Mitsubishi Valve Seals Part Number: MD179175
$6.39 MSRP: $8.33
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Product Specifications
- Other Name: Seal, Inlet Valve Stem; Valve Stem Oil Seal; Valve Stem Seal
Fits the following Mitsubishi Models:
- Eclipse Cross | 2022-2024, 2018-2020 | ES, LE, SE, SE Special Edition, SEL, SEL Special Edition, SEL Touring, SP | 4 Cyl 1.5 L GAS
- Mirage | 2017-2024, 2014-2015 | BE, Black Edition, Carbonite Edition, DE, ES, GT, LE, RF, SE | 3 Cyl 1.2 L GAS
- Mirage G4 | 2017-2024 | BE, Carbonite Edition, ES, LE, RF, SE | 3 Cyl 1.2 L GAS
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Mitsubishi Valve Seals Part Number: MD197467
$6.60 MSRP: $8.60
You Save: $2.00 (24%)
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Product Specifications
- Other Name: Seal, Valve Stem; Valve Stem Seal; Valve Spring Retainers
Fits the following Mitsubishi Models:
- 3000GT | 1997-1999 | Base | 6 Cyl 3.0 L GAS
- Cordia | 1984-1988 | Base, L, LS, Turbo | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L GAS
- Diamante | 1993-1996 | ES, LS | 6 Cyl 3.0 L GAS
- Eclipse | 1990-1994 | Base, GS | 4 Cyl 1.8 L GAS
- Expo | 1992 | Base, SP | 4 Cyl 2.4 L GAS
- Galant | 1985-1988 | Base, Sigma | 4 Cyl 2.4 L GAS, 6 Cyl 3.0 L GAS
- Mighty Max | 1984-1996 | 1 Ton, Base, S, SP, SPX, Sport | 4 Cyl 2.0 L GAS, 4 Cyl 2.3 L DIESEL, 4 Cyl 2.4 L GAS, 4 Cyl 2.6 L GAS, 6 Cyl 3.0 L GAS
- Mirage | 1985-1988 | Turbo | 4 Cyl 1.6 L GAS
- Montero | 1984-1994 | Base, LS, RS, SP, SR, Sport | 4 Cyl 2.6 L GAS, 6 Cyl 3.0 L GAS
- Sigma | 1989-1990 | Base | 6 Cyl 3.0 L GAS
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Mitsubishi Valve Seals Part Number: MD306078
$6.67 MSRP: $8.68
You Save: $2.01 (24%)
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Product Specifications
- Other Name: Seal, Inlet Valve Stem; Valve Stem Oil Seal; Valve Stem Seal
Fits the following Mitsubishi Models:
- Mirage | 1997-2002 | DE | 4 Cyl 1.5 L GAS
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Mitsubishi Valve Seals Part Number: MD306079
$7.69 MSRP: $10.01
You Save: $2.32 (24%)
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Product Specifications
- Other Name: Seal, Inlet Valve Stem; Valve Stem Oil Seal; Valve Stem Seal
Fits the following Mitsubishi Models:
- 3000GT | 1995-1999 | Base, SL, Spyder SL, Spyder VR-4, VR-4 | 6 Cyl 3.0 L GAS
- Diamante | 1994-1996 | ES, LS | 6 Cyl 3.0 L GAS
- Lancer | 2005-2006 | ES, OZ Rally, SE | 4 Cyl 2.0 L GAS
- Montero | 1995-1996 | SR | 6 Cyl 3.5 L GAS
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Mitsubishi Valve Seals Part Number: MQ718311
$7.76 MSRP: $10.10
You Save: $2.34 (24%)
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Product Specifications
- Other Name: Seal, Valve Stem; Valve Stem Oil Seal; Valve Stem Seal
Fits the following Mitsubishi Models:
- Outlander | 2022-2024 | Black Edition, ES, SE, SE Launch Edition, SEL, SEL Launch Edition | 4 Cyl 2.5 L GAS
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Mitsubishi Valve Seals Part Number: MD307341
$8.08 MSRP: $10.52
You Save: $2.44 (24%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Seal, Exhaust Valve Stem; Valve Stem Oil Seal; Valve Stem Seal
Fits the following Mitsubishi Models:
- Outlander | 2014-2020 | ES, LE, SE, SEL, SP | 4 Cyl 2.4 L GAS
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Mitsubishi Valve Seals Red Part Number: MD184303
$8.18 MSRP: $10.65
You Save: $2.47 (24%)
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Product Specifications
- Other Name: Seal, Valve Stem; Valve Stem Oil Seal; Valve Stem Seal
Fits the following Mitsubishi Models:
- Diamante | 1997-2004 | Base, ES, LS, VR-X | 6 Cyl 3.5 L GAS
- Eclipse | 1995-2012 | GS, GS Sport, GT, GTS, RS, SE, Spyder GS, Spyder GS Sport, Spyder GT, Spyder GTS, Spyder SE | 4 Cyl 2.0 L GAS, 4 Cyl 2.4 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.8 L GAS
- Endeavor | 2010-2011, 2004-2008 | LS, Limited, SE, XLS | 6 Cyl 3.8 L GAS
- Expo | 1993-1995 | Base, SP | 4 Cyl 2.4 L GAS
- Expo LRV | 1992-1994 | Base, Sport | 4 Cyl 1.8 L GAS, 4 Cyl 2.4 L GAS
- Galant | 1993-2012 | DE, ES, FE, GS, GTS, GTZ, LS, Ralliart, S, SE, Sport Edition, Sport V6 | 4 Cyl 2.0 L GAS, 4 Cyl 2.4 L GAS, 6 Cyl 3.0 L GAS, 6 Cyl 3.8 L GAS
- Lancer | 2002-2007 | ES, LS, OZ Rally, Ralliart, SE, Sportback, Sportback Ralliart | 4 Cyl 2.0 L GAS, 4 Cyl 2.4 L GAS
- Mirage | 1993-2002 | DE, ES, LS | 4 Cyl 1.8 L GAS
- Montero | 1995-2006 | Base, LS, Limited, SR, XLS | 6 Cyl 3.0 L GAS, 6 Cyl 3.5 L GAS, 6 Cyl 3.8 L GAS
- Montero Sport | 1997-2004 | ES, LS, Limited, XLS, XS | 6 Cyl 3.0 L GAS, 6 Cyl 3.5 L GAS
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Mitsubishi Valve Seals Part Number: MD307343
$8.47 MSRP: $11.03
You Save: $2.56 (24%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Seal, Valve Stem; Valve Stem Oil Seal; Valve Stem Seal
Fits the following Mitsubishi Models:
- 3000GT | 1991-1999 | Base, SL, Spyder SL, Spyder VR-4, VR-4 | 6 Cyl 3.0 L GAS
- Diamante | 1992-1996 | ES, LS | 6 Cyl 3.0 L GAS
- Eclipse | 1990-1999 | GS, GST, GSX, Spyder GST | 4 Cyl 2.0 L GAS
- Galant | 1994, 1989-1992 | ES, GS, GSR, GSX, LS, S, VR-4 | 4 Cyl 2.0 L GAS, 4 Cyl 2.4 L GAS
- Lancer | 2005-2006 | ES, OZ Rally, SE | 4 Cyl 2.0 L GAS
- Mirage | 1985-2002 | Base, DE, ES, GS, L, LS, RS, S, SE, Turbo, VL | 4 Cyl 1.5 L GAS, 4 Cyl 1.6 L GAS
- Montero | 1994-1996 | SR | 6 Cyl 3.5 L GAS
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Mitsubishi Valve Seals Part Number: MN183952
$11.28 MSRP: $14.68
You Save: $3.40 (24%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Seal, Inlet Valve Stem; Valve Stem Oil Seal; Valve Stem Seal
Fits the following Mitsubishi Models:
- Lancer | 2008-2017 | DE, ES, ES Sportback, GT, GT Sportback, GTS, GTS Sportback, Ralliart, Ralliart Sportback, SE, SEL | 4 Cyl 2.0 L GAS, 4 Cyl 2.4 L GAS
- Outlander | 2008-2013 | ES, SE | 4 Cyl 2.4 L GAS
- Outlander PHEV | 2023-2024, 2018-2021 | ES, GT, LE, Platinum Edition, Ralliart, SE, SE Tech, SEL, SEL Premium, SEL Touring | 4 Cyl 2.0 L PLUG-IN HYBRID EV-GAS (PHEV), 4 Cyl 2.4 L PLUG-IN HYBRID EV-GAS (PHEV)
- Outlander Sport | 2011-2024 | BE, ES, GT, GT Special Edition, LE, Ralliart, S, SE, SE Special Edition, SEL, SP, Trail Edition | 4 Cyl 2.0 L GAS, 4 Cyl 2.4 L GAS
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Mitsubishi Valve Stem Seal

Mitsubishi Valve Stem Seal serve the purpose of maintaining strong engine compression. These valves are designed in a manner so that they hug the valve stem tightly and do not allow leaks from the combustion chamber. Mitsubishi first hit the car market with the 1917 Model A sedan, and since then, the company has packed many practical technologies into its vehicles while maintaining good build quality. The MIVEC engines feature the right mix of response and fuel economy. Super All Wheel Control gives extra grip on slippery roads. Moreover, thoughtful touches like cruise control and smartphone link simplify daily driving. In its drive to investigate future mobility, the company even experiments with plug-in hybrids, fuel cells, and city-friendly electric concepts but stays committed to the tried-and-tested reliability families trust. The wide range of strengths of this entire collection results in a reputation for reliable performance and easy serviceability. The Valve Stem Seal is no ordinary part. Matching this reputation, this part plays an understated yet important function across the whole engine family. The Valve Stem Seal prevents oil from leaking into the combustion chamber by encircling the slender valve stem. It also ensures that pressurized gases do not leak out. As the camshaft lifts and lowers the valve, it uses the spring force to snap the valve back down onto its seat with enough force to keep airflow correct. This small but tough component works towards creating valvetrain harmony, reducing wear, preventing overheating, and allowing every Mitsubishi engine to keep breathing clearly mile after mile.

Pick genuine OEM Valve Stem Seal if you want superb performance and durability that lasts. Mitsubishi builds that using high-grade materials and official factory techniques to meet very strict standards. This means you get parts you can actually trust for your daily drive. Finding the right parts is simple in the massive stock of genuine inventory. You can stop guessing if a part will fit or hold up. You will love the low prices, dependable service and the real manufacturer's warranty on Mitsubishi Valve Stem Seal. Order today and the store will ship your brand-new items to your door as fast as possible.

Mitsubishi Valve Stem Seal Parts Questions & Experts Answers

Valve Seals
MD197467
Q: Can a broken Valve Spring, a damaged Valve Spring Retainer and a defective Valve Stem Seal be replaced without removing the cylinder heads on Mitsubishi Montero?
A:
Replacement of broken valve springs and defective valve stem seals can occur without the need to take off the cylinder heads. This usually requires two special tools and an air supply. When compressed air is unavailable, a length of nylon rope may prevent the valves from falling into the cylinder. To start, the valve cover of the cylinder head in question has to be removed. If all valve stem seals are being replaced then both covers. Then, take out the spark plug from the cylinder having the defective component and turn the crank shaft until the piston reaches its top dead center on the compression stroke. An air hose from a compressed air source should be connected to an adapter screwed into the plug hole. Once you have removed the rocker and the shafts, blast air into the cylinder. The air pressure will hold the valves in their place. A method can also be used whereby the air pressure is not activated. In this case, the piston can be placed just before TDC, and nylon rope can be fed manually into the combustion chamber. Tightly stuff shop rags in the cylinder head holes so that nothing falls down into the engine. Then use a valve spring compressor to compress the spring and remove the keepers. After removing the spring retainer, shield, valve spring, and guide seal, wrap a rubber band or tape around the valve stem, so it does not fall into the combustion chamber when you release the air pressure. Examine the valve stem for damage, and check if it can move freely in the guide. To keep the valve closed, air pressure is reapplied. The valve stem will be lubricated using engine oil, and the new guide seal will be installed. Place spring over valve and install spring retainer. Next, compress spring and carefully position the keepers. Use grease to hold the keepers in position. Once the keepers are seated, remove the air hose, adapter, place the spark plugs and reconnect the wires. In conclusion, engage the engine and observe for any oil leakage or the occurrence of odd noises.