Timing chain. Porsche 996 / 986  ❭  99610517157

Timing chain. 
This OE Match timing chain is a replacement camshaft timing chain for Porsche 996 and 986 Boxster models. It is designed to match the original-style fit and function, helping maintain correct engine timing and reliable valve train operation.
1 per engine

Fits:
Porsche 996 3.4L 1998 - 2000
Porsche 986 Boxster 1997 - 2001

Diagram Ref No 17

The timing chain links the crankshaft drive to the camshaft drive system, keeping the camshafts synchronised with the crankshaft. Correct timing allows the engine valves to open and close at the right moment, supporting smooth running, correct combustion, and dependable engine performance.

Functions
•  Drives the camshaft timing system
•  Helps keep crankshaft and camshaft timing synchronised
•  Supports correct valve opening and closing timing
•  Helps maintain smooth engine running and performance
•  Replaces stretched, noisy, worn, or damaged timing chains
•  Supports reliable valve train operation
•  OE Match replacement for engine timing repair or rebuild work.

Why Replace This Part?
Timing chains are exposed to constant load, heat, oil, and high-speed engine operation. Over time, a chain can stretch, wear, become noisy, or affect accurate camshaft timing. A worn timing chain may cause rattling noises, poor running, timing deviation faults, reduced performance, or potential engine damage if left unresolved. Replacing the timing chain helps restore accurate timing and long-term engine reliability.

When to Replace This Part
•   The timing chain is stretched, worn, noisy, or damaged
•   There is rattling from the timing chain area
•   Camshaft timing deviation faults are present
•   The engine has poor running, misfires, or reduced performance linked to timing issues
•   Chain guides, tensioners, sprockets, or related timing components are being replaced
•   The engine is being rebuilt or overhauled
•   Preventative replacement is being carried out during major engine service.

Where it fits on the car
This timing chain fits inside the engine timing chain system on Porsche 996 and 986 Boxster models. It forms part of the camshaft drive arrangement and should be installed according to the factory timing layout and engine specification.

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Related, superseded, cross reference or alternative numbers for comparison.

99610517157

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