🚗 Classic Fault — Fiat 124 BS (1966–1985)
Fiat 124 Spider twin-cam timing belt failure
💰 Estimated Repair Cost
$60 – $200 GBP
Parts and labour estimate
🔧 Tools Required
Timing belt tools, torque wrench
📋 Overview
The Lampredi twin-cam engine in the 124 Spider uses a timing belt. Failure causes complete engine destruction on this interference engine.
🩺 Symptoms
- No warning — sudden engine failure
- bent valves
- loss of compression
🔍 Possible Causes
- Belt age — should be replaced every 3 years regardless of mileage
- tensioner failure
- idler failure
🛠️ Diagnosis Steps
Check belt condition and service history. Replace immediately if date unknown.
✅ Most Confirmed Fix
Timing belt and tensioner replacement — mandatory preventive maintenance
95% of users confirm this fix worked (38 reports)
🔗 Other Fiat 124 BS Faults
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