Timing chain assessment and replacement

A rattle at start-up or a camshaft and crankshaft correlation code can point the investigation towards the timing system. Before proposing a chain replacement, we need to find out whether the timing is out and what could have caused it.

What may need checking on a chain-driven engine

Depending on the engine and the findings, checks can include timing and the condition of the chain, guides and tensioner. Oil supply can be relevant where a hydraulic tensioner is used. A recording or fault code can help guide the investigation, but cannot establish the condition of the parts.

If the timing has slipped

We consider whether the fault could have damaged valves or pistons before quoting. A confirmed timing fault may need limited work or an engine rebuild assessment if there is extensive damage.

What to share

Tell us when the noise occurs, whether the engine stopped and whether any codes were recorded. See engine diagnostics for how we agree the next checks.

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