Chain adjuster. Porsche 987.1 Boxster / 987C.1 Cayman / 997.1 Carrera / 996 Carrera  ❭  99610518802

Chain adjuster
This chain adjuster is an OE Match high-quality replacement component engineered for Porsche water-cooled flat-six engines. Installed within the timing chain system, this hydraulic adjuster ensures the timing chain remains correctly tensioned against the camshaft and crankshaft gears.

Fits:
Porsche 987.1 Boxster 2005 - 2008
Porsche 987C.1 Cayman 2005 - 2008
Porsche 997.1 Carrera 2005 - 2008
Porsche 996 Carrera 1998 - 2004

Diagram ref no 34

Designed to meet original Porsche specifications, this unit plays a critical role in maintaining precise valve timing and smooth engine operation. It is commonly fitted on the upper right side of the engine and works in conjunction with guide rails and seals to stabilise chain movement.

By preventing slack in the timing chain, the adjuster helps avoid irregular engine timing, excessive wear, and potential internal engine damage.

This chain adjuster uses hydraulic pressure to maintain consistent tension on the engine’s timing chain. It compensates for chain stretch and wear over time, ensuring the camshafts rotate in perfect synchronisation with the crankshaft.

Function
• Maintains correct timing chain tension during engine operation
• Prevents chain slack and misalignment
• Ensures accurate camshaft timing and engine performance
• Reduces engine noise, particularly during cold starts
• Protects against timing chain slip or jump, which can cause severe engine damage

A worn or failing chain adjuster can allow slack in the timing chain, leading to incorrect valve timing and potential engine damage. In severe cases, the chain can skip teeth, resulting in catastrophic internal failure. Replacing the adjuster ensures proper chain control, protects engine components, and restores smooth, quiet operation.

When to replace
•  Rattling or chain noise on cold start
•  Engine timing issues or misfire symptoms
•  During timing chain or engine rebuild
•  High mileage engines with original tensioners
•  Evidence of oil leakage or reduced hydraulic pressure

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Related, superseded, cross reference or alternative numbers for comparison.

99610518802

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