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Original Porsche Part Genuine Porsche part 99610522351

Code: 99610522351

Genuine Porsche part

Original Porsche Part

Additional information:

• This part is brand new and unused.
• Please verify that it is 100% suitable for your specific vehicle before purchase to ensure compatibility.

Before purchasing thoroughly check part to confirm compatibility.

Related products

Engine cylinder head exhaust valve. Porsche 996 3.4L / Boxster 986 3.2L / Boxster 987 3.2L

99610524700/1

Product Information

Engine Cylinder Head Exhaust Valve.

The OE Match Engine Cylinder Head Exhaust Valve is a precision replacement valvetrain component designed to control the release of burnt combustion gases from the engine cylinder.

Fits:

Porsche Boxster S 986 3.2L 1999-02
Porsche Boxster S 986 3.2L 2003-04
Porsche Boxster 987 S 3.2/3.4L 2005-08/08
Porsche 996 C2 3.4L 1997-08/01
Porsche 996 C4 3.4L 1997-08/01

Diagram Ref No 9

Located within the cylinder head, the exhaust valve opens at the correct point in the engine cycle to allow combustion gases to leave the cylinder and enter the exhaust system. It then closes firmly against the valve seat to seal the combustion chamber during the compression and power strokes.

Because exhaust valves are directly exposed to extremely hot combustion gases, they operate under demanding thermal and mechanical conditions. Correct valve condition and seating are therefore essential for maintaining cylinder compression, efficient combustion and reliable engine performance.

This OE Match replacement provides an OE-style solution for engine repair, cylinder-head refurbishment or complete engine rebuilding.

What This Product Does:

Controls the flow of exhaust gases out of the combustion chamber.
Opens to allow burnt gases to enter the exhaust system.
Closes against the valve seat to seal the cylinder.
Helps maintain correct cylinder compression.
Supports efficient combustion and engine performance.
Works with the camshaft, lifters, valve spring, valve guide and valve seat.
Helps maintain consistent engine power and smooth running.
Provides the correct sealing surface between the valve and cylinder head.
Replaces a burnt, bent, worn or damaged original exhaust valve.

The valve face must form an accurate seal against the valve seat every time the valve closes. Even relatively minor damage to the valve face or stem can affect cylinder sealing and engine performance.

Symptoms Of Wear Or Failure:
A worn, burnt or damaged exhaust valve may cause:

Engine misfires.
Rough or unstable idle.
Loss of engine power.
Poor acceleration.
Reduced compression in the affected cylinder.
High cylinder leak-down readings.
Air leakage heard through the exhaust during a leak-down test.
Difficulty starting the engine.
Increased fuel consumption.
Engine management warning light.
Misfire-related fault codes.
Irregular exhaust note.
Ticking or tapping noises from the cylinder head.
Burnt, pitted or eroded valve face.
Bent or excessively worn valve stem.
Excessive carbon deposits.
Visible overheating or discolouration of the valve.

A damaged exhaust valve can prevent the cylinder from sealing correctly, allowing compression and hot combustion gases to escape into the exhaust port.

Why Replacement Matters:
Exhaust valves operate in one of the hottest areas of the engine. Every combustion cycle exposes the valve head and seating surface to intense heat while the valve repeatedly opens and closes at high speed.

Over time, an exhaust valve can suffer from:

Valve-face erosion.
Pitting or burning.
Carbon build-up.
Stem wear.
Mechanical distortion.
Overheating.
Poor seating caused by valve-guide or valve-seat wear.

Once the valve can no longer seal correctly, compression in the affected cylinder can fall. This can lead to misfires, reduced power, rough running and increased fuel consumption.

Replacing a damaged exhaust valve helps restore:

Correct combustion-chamber sealing.
Cylinder compression.
Smooth engine operation.
Reliable exhaust-gas control.
Consistent engine performance.
Correct valvetrain operation.

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

99610524700

99610511359

99610524700

996.105.247.00

3891.239

864439-6

22909

The product you are viewing cross references to these numbers

3 3 3

Camshaft adjuster seal. Porsche 986 Boxster / 996 >>2001

99610522352/1

Product Information

Camshaft adjuster seal.
This is a sealing ring for the timing chain tensioner used in Porsche M96/M97 engines (996, early Boxster, Cayman, etc.). Its purpose is to seal the hydraulic timing chain tensioner, which relies on engine oil pressure to keep the timing chain tight and correctly tensioned.

Fits:
Porsche 986 Boxster / S >>2001
Porsche 996 C2 / C4 >>2001

Diagram ref no 20

• Position on Vehicle: Installed within the engine timing cover/tensioner housing area - interacts directly with the chain tensioner mechanism to hold hydraulic pressure and oil flow correctly.

• Applications: Especially recommended when performing timing chain service, chain guide/tensioner replacement or when the original seal shows oil seepage or has been re-used in high-load service conditions.

In the intricate timing chain system of the M96/M97 engines, the tensioner seal is critical for maintaining correct hydraulic pressure and preventing oil leakage. A worn or failed seal can allow pressure loss, cause chain slack, timing drift or increased engine stress - even leading to damage if timing is compromised. Replacing this seal ensures the tensioner works as designed, helps maintain timing chain alignment and preserves the overall health of your engine.

When and why to replace:
• You are already servicing the timing chain, tensioner, or guides.
• Noticing oil leaks or seepage around the timing cover or tensioner area.
• Engine exhibits timing-chain noise, erratic timing or hydraulic pressure issues.
• High-mileage engine where original seals have aged or may be brittle.
• Preventative maintenance during major service to avoid future timing-chain failures.

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

99610522352

99610522352

99610522351

The product you are viewing cross references to these numbers

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Original Porsche Part Genuine Porsche part 99610522351