Timing Chain Stretch
Symptoms
Rattling or slapping noise from the front of the engine, particularly on cold startup. In advanced cases, the cam timing shifts, reducing power and causing rough running.
Cause
The duplex timing chain that drives the twin overhead camshafts stretches over time, even on low-mileage engines, because the chain has been under tension for decades. The chain tensioner may also lose effectiveness as its spring weakens or its piston seal leaks.
Fix
Replace the timing chain, tensioner, and chain guides.
This requires front cover removal and careful cam timing setup.
On a 2000GT, this is a specialist job, the DOHC head requires precise cam timing to avoid valve-to-piston contact.
Cost: $3,000-6,000 AUD at a specialist workshop.
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