🚗 Classic Fault — Mercedes-Benz W115 (1968–1976)
Points rubbing block worn flat — dwell angle lost
💰 Estimated Repair Cost
$8 – $20 USD
Parts and labour estimate
🔧 Tools Required
Feeler gauge, dwell meter
📋 Overview
The fibre rubbing block on the contact breaker points wears down reducing the gap. The engine initially becomes harder to tune, then begins misfiring as gap approaches zero.
🩺 Symptoms
- Gradually worsening misfire
- dwell angle outside specification
- points gap reducing between services
🔍 Possible Causes
- Worn points rubbing block
- cam follower worn
🛠️ Diagnosis Steps
Measure dwell angle and compare to specification. If gap is at minimum but dwell is high, rubbing block is worn.
✅ Most Confirmed Fix
Replace contact breaker points. Always replace condenser simultaneously.
90% of users confirm this fix worked (48 reports)
🏷️ Parts Needed
Contact breaker points set
🔗 Other Mercedes-Benz W115 Faults
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