Timing chain stretch and tensioner wear
Symptoms
Rattling from the front of the engine on startup that may or may not settle when warm. In severe cases, the chain can jump a tooth, causing valve timing issues or valve-to-piston contact.
Cause
The duplex timing chain stretches over high mileages. The tensioner wears and loses its ability to take up slack.
Fix
Replace the timing chain, tensioner, and sprockets.
It's a front-of-engine job, not a weekend task but not catastrophic either.
Budget $1,500-3,000 AUD including parts and labour.
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