🚗 Classic Fault — Porsche 901/911 (1963–1989)
Porsche 911 chain tensioner failure (pre-1984)
💰 Estimated Repair Cost
$200 – $800 GBP
Parts and labour estimate
🔧 Tools Required
Timing tools, engine removal
📋 Overview
Pre-1984 911s use mechanical chain tensioners that can fail suddenly, allowing chain slack and potential engine damage.
🩺 Symptoms
- Loud rattling from engine on startup
- rattling under load
- sudden engine damage if ignored
🔍 Possible Causes
- Failed chain tensioner
- worn timing chain
- low oil pressure
🛠️ Diagnosis Steps
Listen carefully for chain rattle on cold start. Have tensioners inspected at every service on pre-1984 cars.
✅ Most Confirmed Fix
Chain tensioner replacement — consider hydraulic conversion
82% of users confirm this fix worked (22 reports)
🔗 Other Porsche 901/911 Faults
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