Timing Chain

📖 YOUCANIC Automotive Glossary

The timing chain performs the same function as a timing belt — synchronizing the crankshaft and camshaft — but is made of metal links similar to a bicycle chain and is lubricated by engine oil rather than running dry. Timing chains are designed to last the life of the engine, but they are not immune to wear, and poor oil maintenance is their number one enemy. As the chain stretches over time or the tensioner weakens, timing becomes slightly off and the engine’s performance and efficiency begin to suffer. Common symptoms of a worn or stretched timing chain include a rattling or chattering noise from the front of the engine that is loudest at cold startup and may quiet down as oil pressure builds, a check engine light with camshaft or crankshaft correlation codes like P0016 or P0017, rough idle, reduced power, and poor fuel economy. Regular oil changes with the correct viscosity oil are the single most effective way to extend timing chain life.