Timing chain. Porsche 996 / 986 Boxster  ❭  99610517753

Engine timing chain. CLOSED TYPE.
OE Match replacement engine timing chain - also referred to as the camshaft/intermediate shaft timing chain - designed to replicate the original Porsche timing chain used in the engine timing drive system of early 911 (996) and Boxster engines.
2 per engine. Sold each.

Fits:
Porsche 996 3.4L C2/C4 1998 - 2001
Porsche 986 Boxster 1997 - 2004

Diagram Ref No 26.

The timing chain ensures precise mechanical synchronization between critical rotating components of the engine - primarily the crankshaft and camshafts (and in some layouts, the intermediate shaft). It maintains the correct timing of valve opening and closing events relative to piston position, which is vital for efficient combustion, smooth engine operation, and proper power delivery.

Function:
•  Synchronises rotation of the crankshaft and camshafts
•  Maintains correct valve timing for intake and exhaust events
•  Transfers mechanical drive through intermediate gears/shafts
•  Supports reliable engine performance and emissions control.

A worn or elongated timing chain can cause timing errors, engine noise, rough running, or in more severe cases, engine damage if the timing relationship is lost.

The timing chain is a critical engine component. Over long service intervals and high mileage, the chain can stretch or wear, leading to slack, improper timing, and noisy operation. If not addressed, timing chain issues can cause:
•  Engine noise (chain rattle)
•  Poor idle and power delivery
•  Timing inaccuracies affecting combustion
•  Potential engine damage if timing is lost.

Replacing worn chains with an OE Match unit helps ensure accurate timing, preserves engine performance, and protects other internal engine components.

When to replace. Replace the timing chain when:
•  There is rattling or slapping noise from the timing cover area
•  Timing chain slack is detected in inspection
•  You are performing an engine rebuild or overhaul
•  Timing tensioner or guides show wear
•  Irregular idle or misfires suggest timing drift

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Related, superseded, cross reference or alternative numbers for comparison.

99610517753

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