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.jpg?width=440&height=320 "Valve Stem Seal Kit, Set Of 8. Porsche 944 TURBO / TURBO S - 95110419501, 70-27411-00, 702741100 - 12-27411-01")
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
The Victor Reinz Valve Stem Seal Kit is a set of 8 replacement valve stem seals designed to control the amount of engine oil reaching the valve stems and valve guides within the cylinder head.
Fits:
- Porsche 944 Turbo 2.5L 8V 1985-88
- Porsche 944 Turbo 2.5L 8V 1989-91
- Porsche 944 Turbo S 2.5L 8V 1988
Diagram Ref No 12
Valve stem seals are small but important engine components. They allow the valve stems to receive the lubrication they require while preventing excessive engine oil from entering the combustion chambers.
As valve stem seals age, they can harden, crack or lose their ability to seal effectively. Excessive oil can then pass down the valve guides and enter the combustion chamber, potentially causing blue exhaust smoke, increased oil consumption, spark plug fouling and carbon deposits.
What This Product Does:
Each engine valve moves repeatedly through a valve guide as the engine operates. These moving surfaces require lubrication, but too much oil entering the valve guide area can allow engine oil to reach the combustion chamber.
The valve stem seal provides controlled sealing around the valve stem.
It allows sufficient lubrication for the valve and guide while restricting excessive oil from travelling down the valve stem.
Correctly functioning valve stem seals help:
- Control oil around the valve stems and guides
- Prevent excessive oil entering the combustion chambers
- Reduce unnecessary engine oil consumption
- Minimise oil-related exhaust smoke
- Reduce carbon deposits
- Help prevent spark plug contamination
- Support clean and efficient combustion
Symptoms Of Wear Or Failure:
Valve stem seals are continuously exposed to engine oil, high cylinder-head temperatures and rapid valve movement. Over time, the sealing material can become hard, brittle or worn.
Common symptoms of deteriorated valve stem seals include:
- Blue or blue-grey exhaust smoke
- Smoke immediately after engine start-up
- Exhaust smoke after the vehicle has been idling
- Smoke after prolonged engine braking or deceleration
- Increased engine oil consumption
- Oil-fouled spark plugs
- Carbon deposits in the combustion chambers
- Increased exhaust emissions
- Oil deposits within the exhaust system
- Gradual deterioration in engine performance
One particularly common indication is a brief cloud of blue smoke when starting the engine after it has been parked. Oil can seep past worn seals while the engine is stationary and then burn when the engine is started.
Why Replacement Matters:
Worn valve stem seals can result in much more than visible exhaust smoke.
Continued oil entering the combustion chamber can contribute to:
- Excessive engine oil consumption
- Spark plug fouling
- Carbon accumulation
- Increased exhaust emissions
- Contamination of exhaust components
- Reduced combustion efficiency
- Potential catalytic converter contamination over time
Replacing worn seals restores more effective control over the amount of oil reaching the valve stems and combustion chambers.
This can help reduce oil consumption and smoke where deteriorated valve stem seals are confirmed as the cause.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
95110419501
The product you are viewing cross references to these numbers
This kit is comprised of the following items:
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Valve Spring
Sold each
The Porsche Valve Spring is a critical component
of the valve train system fitted to numerous Porsche 911 and Porsche 964 models
from 1965 to 1994. Designed to maintain precise valve operation throughout the
engine's RPM range, the valve spring ensures that intake and exhaust valves
close correctly after being opened by the camshaft.
Fits:
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
- Porsche 964 (911) RS 3.6L 1991-93
- Porsche 964 (911) RS 3.8L 1991-93
- Porsche 964 (911) TURBO 3.3L 1991-93
- Porsche 964 (911) TURBO 3.6L 1991-93
Diagram Ref No 13
In Porsche's legendary air-cooled flat-six engines, accurate valve control is essential for maintaining combustion efficiency, engine performance, reliability, and long-term durability. The valve spring works continuously under extreme mechanical stress, cycling thousands of times per minute to keep the valve train operating correctly.
Whether you're rebuilding a classic Porsche engine, restoring a 911, or carrying out a cylinder head overhaul, replacing worn valve springs helps maintain factory performance and reduces the risk of costly engine damage.
What Does the Valve Spring Do?
The valve spring is responsible for returning the intake and exhaust valves to their closed position after each opening cycle generated by the camshaft.
Its key functions include:
- Maintaining correct valve timing operation
- Ensuring valves close fully and consistently
- Keeping the valve train under proper tension
- Preventing valve float at higher engine speeds
- Supporting engine compression and combustion efficiency
- Protecting the valve train from instability and excessive wear
Without adequate spring tension, valves may not close correctly, leading to poor performance and potential engine damage.
Why Does the Valve Spring Fail?
Valve springs are constantly subjected to compression, heat, vibration, and high engine speeds. Over time, these factors can lead to material fatigue and a gradual loss of spring tension.
Common causes of valve spring failure include:
- Metal fatigue from repeated cycling
- High mileage wear
- Prolonged exposure to engine heat
- Over-revving the engine
- Corrosion or contamination
- Performance modifications increasing valve train loads
- Age-related weakening of spring material
- Improper engine assembly or valve train geometry
As spring pressure decreases, valve control becomes less precise, particularly at higher RPM.
Common Symptoms of Worn Valve Springs
A weakened or damaged valve spring may cause:
- Loss of engine performance
- Valve float at higher RPM
- Rough idle
- Engine misfires
- Increased valve train noise
- Reduced power output Inconsistent compression readings
- Premature wear of valves, guides, and camshaft components
In severe cases, a broken valve spring can result in valve-to-piston contact and major engine damage.
When Should You Replace Valve Springs?
Valve springs should be inspected whenever the cylinder heads are removed and replaced if any signs of fatigue or wear are detected.
Replacement is strongly recommended:
- During complete engine rebuilds
- During cylinder head refurbishment
- On high-mileage engines
- When installing performance camshafts
- If valve float is present
- When spring tension falls below specification
- During preventative maintenance on restoration projects
- Whenever a spring shows signs of corrosion or damage
Many experienced Porsche engine builders replace all valve springs during rebuilds to ensure consistent valve train performance and long-term reliability.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
90110590151
The product you are viewing cross references to these numbers
- Porsche 964 (911) C2 1989-93
- Porsche 964 (911) C4 1989-93
Fits:
Porsche 964 C2 / C4 1989-94
Click 'Zoom in' for large parts diagram.
Diagram Ref No 2, 2A.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
964104321
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- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)
- Porsche 964 (911) TURBO 3.3L 1991-93
Fits:
Porsche 930 turbo 3.0ltr - 1975 to 1977
Porsche 930 turbo 3.3ltr - 1978 to 1989
Porsche 964 turbo 3.3ltr - 1991 to 1992
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Diagram Ref No 10.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
93010541950
The product you are viewing cross references to these numbers