Built to Last, Not Built Forever
A timing chain links the crankshaft to the camshafts, like a timing belt, but it's made of metal and runs inside the engine in oil.
Most chains go the life of the engine. Some don't. Over time the chain can stretch, and the plastic guides and tensioner that keep it tight can wear or crack. The cam timing drifts, the engine throws fault codes, and you hear a rattle, especially from cold.
Catch it early and it's a planned repair. Ignore it and a chain that jumps a tooth or breaks can bend valves and wreck the engine.
When to Get It Checked
What Gets Replaced
Getting to a timing chain usually means taking the front or back of the engine apart, so the parts that wear with it are replaced at the same time.
Timing chain
Matched to the engine code, fitted with the engine locked in time.
Tensioner
Keeps the chain tight. A tired one is a common cause of rattle.
Guides
Plastic rails the chain runs on. They wear and can break up.
Gears & seals
Sprockets checked or replaced, plus the seals and gaskets disturbed.
Special locking tools hold the camshafts and crankshaft in exact position while the chain is changed, so the engine goes back together perfectly in time.
BMW Timing Chain Jobs
Some BMW engines are known for timing chain and guide wear, including certain four-cylinder petrol and diesel engines. We have the BMW locking tools to do the job properly and follow BMW's procedure. Hear a rattle from your BMW? Book it in before it gets worse. See our BMW page for more.
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Timing Chain FAQ
Does a timing chain need replacing at a set interval?
Usually not. Most chains are designed to last the life of the engine and are only replaced if they stretch, rattle or set timing fault codes.
Is a rattle on start-up serious?
It can be the early sign of a worn tensioner, stretched chain or broken guide. It's worth checking soon, because a chain that jumps a tooth can badly damage the engine.
How long does a timing chain job take?
It depends a lot on the engine. On some the chain is at the front and fairly accessible; on others, including some BMWs, the engine or gearbox has to come out. We'll give you a timeframe with the quote.
How can I make my timing chain last longer?
Regular oil changes with the correct grade make the biggest difference. Chains and tensioners rely on clean oil.
