🚗 Classic Fault — Mercedes-Benz (1976–1985)
W123 valve clearance adjustment — tappet noise
💰 Estimated Repair Cost
Up to $60 USD
Parts and labour estimate
🔧 Tools Required
Feeler gauges, valve cover gasket, torque wrench
📋 Overview
Valve clearances require periodic adjustment on W123 engines. Excessive clearance causes tappet noise while insufficient clearance causes valve burning.
🩺 Symptoms
Ticking or tapping from top of engine especially on cold start. Noise may reduce when warm.
🔍 Possible Causes
Normal wear. Incorrect clearance from previous adjustment. Worn camshaft lobes.
🛠️ Diagnosis Steps
Check clearances with engine cold. Compare to specification: OM615/616 intake 0.10mm exhaust 0.20mm.
✅ Most Confirmed Fix
Adjust all clearances to specification. Replace valve cover gasket when refitting.
89% of users confirm this fix worked (31 reports)
🔗 Other Mercedes-Benz Faults
Own a Mercedes-Benz ?
Share your experience with this fault — or report a different issue. Your knowledge helps other classic car owners worldwide.