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Your Vehicle  //  Porsche  //  944 (1982-1991)  //  944 Turbo 2.5L 8V 1985-88
Porsche944 (1982-1991)944 Turbo 2.5L 8V 1985-88Engine Rebuild Parts

Engine Valves / Guides / Springs

Engine Valves / Guides / Springs

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DISPLAYING 1 to 9 (of 9 products)
Valve Stem Seal Kit, Set Of 8. Porsche 944 TURBO / TURBO S - 95110419501, 70-27411-00, 702741100 - 12-27411-01
2
Valve Stem Seal Kit, Set Of 8. Porsche 944 TURBO / TURBO S
95110419501/1KIT
Product Information
Product Information
Valve Stem Seal Kit, Set Of 8.
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
95110419501
70-27411-00
702741100

The product you are viewing cross references to these numbers
Valve cotter half. Porsche 356 / 911 / 964 / 924S / 944 / 928 - 90110541700
4
Valve cotter half. Porsche 356 / 911 / 964 / 924S / 944 / 928
Special Order item
90110541700
Product Information
Product Information
Valve cotter half. 
Sold each - 2 required per engine valve

Fits:
Porsche 356C / SC - 1963 to 1965
Porsche 911 - 1965 to 1989
Porsche 964 - 1989 to 1994
Porsche 944 - 1982 to 1991
Porsche 928 - 1978 to 1986

Click 'Zoom in' for large parts diagram.
Diagram ref no 16



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90110541700
90110541700

The product you are viewing cross references to these numbers
Valve Cotter Half. Porsche 356 / 911 / 964 / 924S / 944 / 928 - 90110541700 - MK-9H
4
Valve Cotter Half. Porsche 356 / 911 / 964 / 924S / 944 / 928
90110541700/1
Product Information
Product Information
Valve Cotter Half.

The TRW Valve Cotter Half is a replacement valve-spring retaining collet for selected classic Porsche engines.
Sold Each.
x2 Required Per Engine Valve.

Fits:
  • Porsche 356C / SC - 1963 to 1965
  • Porsche 911 - 1965 to 1989
  • Porsche 964 - 1989 to 1994
  • Porsche 944 - 1982 to 1991
  • Porsche 928 - 1978 to 1986

Diagram Ref No 16

Also known as a valve keeper, valve collet or valve lock, this small but critical component fits into the machined groove near the top of the valve stem and locks into the valve spring retainer.

Each valve requires two cotter halves. When installed together, the two halves form a tapered locking arrangement that secures the valve spring and spring retainer to the valve stem.

What This Product Does:
The valve cotter forms part of the cylinder-head valvetrain.

Its job is to mechanically lock the valve spring retainer to the valve stem.

The assembly typically consists of:

  • Engine valve
  • Valve spring
  • Spring retainer
  • Two valve cotter halves

When the valve spring is compressed during assembly, the two cotter halves are installed around the valve-stem groove.

As the spring compressor is released, the spring retainer presses against the tapered outside surface of the cotters and locks them securely into position.

This allows the spring to remain attached to the valve while the engine operates at high speed.

Symptoms Of Wear Or Failure:
Valve cotters usually do not produce gradual external symptoms in the same way as a bearing or seal.

Problems are most commonly discovered during cylinder-head inspection or after another valvetrain fault develops.

Possible warning signs include:

  • Unusual valvetrain ticking
  • Metallic noise from the cylinder head
  • Valve spring retainer sitting incorrectly
  • Visible cotter movement
  • Uneven cotter seating
  • Damaged valve-stem groove
  • Cracked or chipped cotter
  • Wear marks around the locking surfaces
  • Spring retainer sitting at an abnormal angle
  • Valve clearance changing unexpectedly
  • Misfire following valvetrain damage
  • Loss of compression
  • Serious mechanical noise after a cotter releases

A correctly installed cotter should remain securely locked and should not visibly move relative to the spring retainer.

Why Replacement Matters:
A damaged valve cotter should never be ignored.

If the cotter loses its grip on the valve stem, the spring retainer can release.

This can allow the valve to drop into the cylinder.

Potential consequences include:

  • Valve-to-piston contact
  • Bent valve
  • Damaged piston
  • Broken valve guide
  • Cylinder-head damage
  • Combustion-chamber damage
  • Severe engine failure

Because the possible consequences are so serious, questionable cotters should be replaced during cylinder-head service rather than reused.



Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

90110541700
90110541700

The product you are viewing cross references to these numbers
Valve spring. Porsche 944 Turbo - 95110590510
2
Valve spring. Porsche 944 Turbo
Special Order item
95110590510
Product Information
Product Information
Valve spring.

Fits:
Porsche 944 Turbo 1985-91

Click 'Zoom in' for large parts diagram.
Diagram Ref No 15.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

95110590510
95110590510

The product you are viewing cross references to these numbers
Valve spring. Porsche 944 Turbo - 95110590510
3
Valve spring. Porsche 944 Turbo
95110590510/1
Product Information
Product Information
Valve spring. Porsche 944 Turbo

Fits:
Porsche 944 Turbo 1985-91

Click 'Zoom in' for large parts diagram.
Diagram Ref No 15.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

95110590510
95110590510

The product you are viewing cross references to these numbers
Valve stem seals. Porsche 911 / 912 / 924S / 944 / 964 / 928 - 92810419312, 92810419313, 91110419300, 91110419303, 92810419308, 96410411107, 596.981, 96410411106, 96410411104, 96410411105
3
Valve stem seals. Porsche 911 / 912 / 924S / 944 / 964 / 928
96410411107/1
Product Information
Product Information

OE Match valve stem seals control oil flow between the valve stems and guides. They are replacement sealing components for cylinder-head repairs and engine rebuilding work.

Supplied each.

Fits

  • Porsche 911 1968-89 (12 Per Engine)
  • Porsche 924S (8 Per Engine)
  • Porsche 944 (8 Per Engine)
  • Porsche 944 2.7L (8 Per Engine)
  • Porsche 964 3.6L (12 Per Engine)
  • Porsche 964 Turbo (12 Per Engine)
  • Porsche 928 (16 Per Engine)

    Check fitment for your specific vehicle (model, year, engine) before ordering.

    Diagram ref no 19

    What Is This Part?

A valve stem seal is a small sealing component fitted around a valve stem at the valve guide in the cylinder head. It meters the oil reaching the sliding stem-to-guide contact, allowing lubrication while restricting excess oil from passing into the engine's gas passages. The seal works alongside the valve and guide, so their condition matters to successful sealing. During cylinder-head work, the seals should be assessed together with valve-stem and guide wear rather than treated as an isolated cure for oil consumption.

What Does This Part Do?

  • Meters lubricating oil: Controls the amount of oil reaching the valve stem and guide contact.
  • Restricts excess oil: Helps limit oil passing down the valve guide towards the inlet or exhaust passage.
  • Seals around a moving stem: Maintains its sealing contact as the valve opens and closes.

    Why Replace This Part?

A damaged sealing lip or a seal that no longer seats correctly can allow too much oil past the valve guide. Replacement is appropriate when inspection identifies deterioration, damage or leakage at this point, including damage sustained during dismantling or installation.

Worn guides can allow excessive sideways valve movement and prevent a replacement seal from controlling oil correctly. Check guide clearance and valve-stem condition during repairs; fitting seals alone will not correct mechanical wear in those components.

When to Replace This Part?

  • Visible damage: Replace a seal with a torn lip, cracking or other deterioration found during inspection.
  • Poor seating: Investigate seals that are displaced or no longer retained correctly on the guide.
  • Oil consumption or blue exhaust smoke: Inspect the seals and guides as possible causes, while checking other sources of oil burning.
  • Valve-guide repairs: Assess the seals when valves or guides are removed and renew those damaged or unsuitable for refitting.
  • Installation damage: Replace any seal whose lip has been cut or distorted while passing over the valve-stem grooves.

    Where Is This Part Fitted?

Location: In the cylinder head, around the valve stem at the upper end of the valve guide, within the valve-spring area.

FAQs

  • Can I replace only the valve stem seals?
    Yes, if inspection confirms the seals are responsible and the valves and guides remain serviceable. Excessive guide clearance needs separate attention.
  • Does exhaust smoke always mean these seals need replacing?
    No. Smoke and oil consumption can have several causes. Confirm the source before deciding on seal replacement or more extensive engine work.
  • What matters during installation?
    Follow the engine-specific procedure, protect the sealing lip from the valve-stem grooves and use the appropriate fitting tool to seat the seal without damage.

    Product Summary
  • Product: Valve stem seals.
  • Brand: OE Match.
  • Supply: Each.
  • Purpose: Controls oil flow at the valve stem and guide.
  • Repair context: Cylinder-head sealing repairs and engine rebuilding.


Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

96410411107
92810419312
92810419313
91110419300
91110419303
92810419308
96410411107
596.981
96410411106
96410411104
96410411105

The product you are viewing cross references to these numbers
Valve stem seals. Porsche 911/ 924/944/964 - 92810419312, 92810419313, 91110419300, 91110419303, 92810419308, 96410411107, 96410411106
2
Valve stem seals. Porsche 911/ 924/944/964
Special Order item
96410411107
Product Information
Product Information
Valve stem seals. Price shown is for each.

Fits:
Porsche 911 1968-89 (12 Per Engine)
Porsche 924S (8 Per Engine)
Porsche 944 (8 Per Engine)
Porsche 944 2.7L (8 Per Engine)
Porsche 964 3.6L (12 Per Engine)
Porsche 964 Turbo (12 Per Engine)
Porsche 928 (16 Per Engine)

Click 'Zoom in' for large parts diagram.
Diagram Ref No 19.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

96410411107
92810419312
92810419313
91110419300
91110419303
92810419308
96410411107
96410411106

The product you are viewing cross references to these numbers
Valve stem seals. Porsche 944 TURBO / TURBO S - 95110419501, 70-27411-00, 702741100
1
Valve stem seals. Porsche 944 TURBO / TURBO S
Special Order item
95110419501
Product Information
Product Information
Valve stem seals.

Fits:
Porsche 944 TURBO / TURBO S 1985-91

Click 'Zoom in' for large parts diagram.
Diagram Ref no 12.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

95110419501
95110419501
70-27411-00
702741100

The product you are viewing cross references to these numbers
Valve stem seals. Porsche 944 TURBO / TURBO S - 95110419501, 70-27411-00, 702741100
1
Valve stem seals. Porsche 944 TURBO / TURBO S
95110419501/1
Product Information
Product Information
Valve stem seals.

Fits:
Porsche 944 TURBO / TURBO S 1985-91

Click 'Zoom in' for large parts diagram.
Diagram Ref no 12.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

95110419501
95110419501
70-27411-00
702741100

The product you are viewing cross references to these numbers
DISPLAYING 1 to 9 (of 9 products)
About Engine Valves / Guides / Springs

Engine Valves, Valve Guides & Valve Springs – Precision, Performance & Reliability for Porsche Engines

The valves, guides, and springs form the heart of your Porsche’s cylinder head, precisely managing airflow and combustion efficiency. Intake (inlet) valves allow the correct air-fuel mixture into the combustion chamber, while exhaust valves release spent gases. Working together with guides and springs, they ensure perfect timing, compression, and power delivery.

At Design911, we offer a comprehensive range of precision-engineered inlet and exhaust valves, valve guides, and valve springs designed for performance, durability, and exact fitment across Porsche models. Each component is manufactured from heat-resistant, high-grade steel or titanium, ensuring reliable operation under extreme conditions.

Whether rebuilding a classic air-cooled flat-six or maintaining a modern turbocharged engine, our high-quality valve components deliver the precision, strength, and sealing performance your Porsche demands.

What Do Valves, Guides & Springs Do?

These components work in harmony to control the critical air and exhaust flow that determines your engine’s power, efficiency, and longevity.

Core Functions:

  • Inlet Valves: Regulate air-fuel intake into the combustion chamber.
  • Exhaust Valves: Release burnt gases efficiently during the exhaust stroke.
  • Valve Guides: Maintain valve alignment and prevent side wear.
  • Valve Springs: Control valve movement, ensuring precise timing and closing pressure.

Together, they keep your Porsche engine breathing freely, running smoothly, and performing as designed — lap after lap, mile after mile.

Why Do Valves, Guides & Springs Fail?

Valves and related components endure extreme heat, pressure, and friction. Over time, these conditions can lead to wear, deformation, or loss of tension, affecting airflow, compression, and overall engine performance.

Common Causes of Failure Include:

  • Valve seat wear or pitting, leading to compression loss.
  • Burnt or bent valves caused by overheating or timing issues.
  • Worn valve guides, increasing oil consumption and exhaust smoke.
  • Weak or fatigued valve springs, resulting in valve float at high RPMs.
  • Corrosion and carbon build-up from poor fuel quality or short trips.

When these issues develop, symptoms may include misfires, poor performance, oil burning, or rough idling — clear indicators that replacement or overhaul is required.

Why Replace with Precision-Engineered Valve Components?

Replacing worn valves, guides, and springs ensures your Porsche engine maintains proper compression, valve timing, and airflow — all essential to reliable power delivery and fuel efficiency.

Key Benefits:

  • Restores correct airflow and combustion efficiency.
  • Improves engine compression and throttle response.
  • Prevents oil leakage and smoke caused by worn guides.
  • Eliminates valve float and restores high-RPM stability.
  • Crafted from premium heat-resistant alloys for durability and longevity.
  • Perfect fitment across classic and modern Porsche engines.

Precision-engineered components bring your engine back to its optimal condition, preserving both performance and refinement.

Highlights:

  • Comprehensive range of inlet and exhaust valves, valve guides, and springs.
  • Precision-manufactured from high-tensile, heat-treated materials.
  • Restores compression, power, and valve timing accuracy.
  • Improves reliability and reduces wear in high-performance engines.
  • Designed for rebuilds, restorations, and performance upgrades.
  • Compatible with air-cooled and water-cooled Porsche models.

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