Chain guide rail set. Porsche 911 1966-89

Chain guide rail set.
This set is for total timing chain system renewal on Porsche 911/914/964 flat-six engines. It includes one brown-type guide rail (part number 91110522205) plus five black-type guide rails (part number 91110522207) - the exact quantities required for a complete timing-train overhaul. Each rail is manufactured to match Porsche’s original specification in material, geometry and wear profile.

SET OF 6, includes:
1 × Guide Rail Brown – part no. 91110522205
5 × Guide Rails Black – part no. 91110522207

Fits:
Porsche 911 1966 - 1989

Diagram ref no 2

• Function: Ensures proper timing-chain alignment, guides chain over sprockets and tensioners, controls chain path geometry, minimises vibration/noise and extends chain & sprocket life.

Over time, guide rails degrade through wear, cracking, distortion or mis-alignment. If any single guide rail is worn or old, you risk chain vibration or changing chain geometry - potentially causing chain noise, accelerated wear of sprockets, timing drift or even catastrophic failure. By replacing all six guide rails (1 brown + 5 black) as a coordinated set, you ensure:
• Uniform wear and material condition across the entire chain path
• Balanced chain ride, consistent tension and accurate timing
• Reduced noise, less chain slap or vibration
• Longer service life for chain, sprockets and tensioners
• Peace of mind during a major engine service or rebuild

When to replace:
• Chain noise or slap detected during start-up or under load
• Visual inspection shows grooves, wear tracks, deformation or cracked guides
• You are performing a full engine bottom end or top-end rebuild
• The engine has high mileage or you’re restoring to full specification

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Related, superseded, cross reference or alternative numbers for comparison.

91110522207

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