Chain guide rail, Black. Porsche 911 1966-89  ❭  91110522207

Chain guide rail, Black.
This guide rail maintains correct chain alignment, reduces wear on the timing chain and sprockets, and helps ensure accurate cam-shaft to crank-shaft timing over the life of the engine. Manufactured to match the original Porsche geometry, this rail provides direct-fit installation and restores proper chain path, quiet operation and long service life.
Sold each, 5 required per car.

Fits:
Porsche 911 1966 - 1989

Diagram ref no 2

• Position: Timing gearcase — the guide rail that supports/locates the front timing chain (or chains), depending on engine version.

• Function: Guides the timing chain to prevent excessive slack, misalignment or premature wear; supports longevity and accurate timing performance.

The timing chain guide rail is a critical component in the timing system of air-cooled Porsche engines: if the guide is worn, cracked, warped or missing, it can cause chain vibration, accelerated wear of the chain/sprockets, timing errors, noise or even catastrophic engine damage. Replacing it with a proper rail ensures correct chain path, quieter operation and long-term reliability.

When and why to replace:
•  Timing chain slap or rattle is audible at startup or under load
•  Visible wear on the existing guide rail (grooving, cracking, deformation)
•  During engine rebuild or timing chain service when the covers are already open
•  High-mileage or track-used engines where timing-system components have extended service life.

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Related, superseded, cross reference or alternative numbers for comparison.

91110522207

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