🚗 Classic Fault — Mercedes-Benz W115 (1968–1976)
Centrifugal advance mechanism sticking
💰 Estimated Repair Cost
$20 – $80 USD
Parts and labour estimate
🔧 Tools Required
Distributor service tools, solvent
📋 Overview
The centrifugal advance flyweights corrode and stick, preventing timing advance at higher RPM. The result is flat performance above 2500 RPM.
🩺 Symptoms
- Flat performance above 2500 RPM
- engine feels restricted at higher revs
- timing does not advance with RPM
🔍 Possible Causes
- Corroded centrifugal advance pivot pins
- broken advance springs
- seized flyweights
🛠️ Diagnosis Steps
Remove cap and rotor. With engine off, rotate rotor against spring tension — should move freely and spring back.
✅ Most Confirmed Fix
Strip distributor. Clean advance mechanism. Replace springs. Lubricate pivot pins.
71% of users confirm this fix worked (16 reports)
🏷️ Parts Needed
Centrifugal advance spring set; distributor service kit
🔗 Other Mercedes-Benz W115 Faults
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