Timing chain guide. Porsche 986 Boxster 1997-02 / 996 3.4L 1998-01  ❭  99610517353

Timing chain guide.
Genuine Porsche Original Equipment (OE) timing chain guide used in the timing system. It provides a precisely engineered surface against which the timing chain runs, helping maintain correct chain alignment and reduce chain noise and wear.
Sold each, 2 required per engine. 

Fits:
Porsche 986 Boxster 2.5L / 2.7L / 3.2L 1997 - 2002
Porsche 996 3.4L 1998 - 2001

Diagram ref no 33.

The timing chain guide provides a wear-resistant contact surface that supports the timing chain’s path as it moves over the crankshaft and camshaft sprockets. It helps maintain correct chain alignment, reduces vibration and chatter, and minimises wear on the chain and related components - especially under repeated load cycles and high-RPM conditions.

Installed inside the timing case, this OE guide sits in the chain’s routing path and provides a controlled sliding surface that interacts with the chain links. It works in conjunction with the timing chain tensioner (e.g., 99610517552) to ensure correct chain tension, reduce chain slack, and preserve accurate valve timing as designed by Porsche.

The timing chain guide is a critical wear item in Porsche M96 engines. Over time, the original guide surfaces can wear, crack, or deform due to friction and engine heat. A compromised guide can lead to timing chain noise (often described as “chain rattle”), reduced tension control, or uneven wear of the chain and sprockets.

Replacing worn or failed guides with a Genuine Porsche OE part restores the exact engineered surface, ensures accurate chain control, reduces noise, and helps protect high-cost timing system components - preserving the precision and performance that Porsche designed into the engine.

When to replace:
•  Engine exhibits timing chain noise, especially at start-up or idle
•  Timing chain slack or vibration is observed
•  During major engine service or rebuild
•  When original guide shows cracking, abrasion, or wear scoring
•  Preventive replacement on high-mile engines

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Related, superseded, cross reference or alternative numbers for comparison.

99610517353

The product you are viewing cross references to these numbers