Timing Chain

Symptoms of Bad Timing Chain

The engine timing chain connects the camshaft to the crankshaft and keeps them rotating in sync. Designed to play a crucial role in the engine's valve timing, the timing chain ensures that the intake and exhaust valves open and close at the appropriate point in the combustion cycle allowing for the intake of the air-fuel mixture and the release of exhaust and combustion gasses during the engine's operation. Older vehicles will typically have one timing chain, but newer models may have multiple cams and chains or belts, as well as a series of guides, tensioners, and more. Since the timing chain is a metal-link design, it requires consistent oil levels. If the oil pressure or oil level drops, it can prevent the chain tensioners from operating correctly and applying tension to the chain or cause friction between the timing chain and the camshaft or crankshaft sprockets. A timing chain that is not properly lubricated can stretch, wear out, and break prematurely, causing engine failure. If the timing chain is too loose, it can also lead to improper valve timing and reduced engine performance, increased emissions, and potential engine damage. Some common signs of a bad timing chain include contaminated oil, metallic rattling noises near the front of the engine, a car that won't start, misfiring, a Check Engine light that is on, or a rattling sound when the engine is running. If the timing chain breaks, the engine will fail to operate, so be sure to inspect the chain if you suspect it needs replacement. Replacing the timing chain before it fails entirely can save your engine from more extensive valve or piston damage. When your vehicle requires a timing chain repair, shop O'Reilly Auto Parts, where we carry new timing chains, tensioners, and timing kits to help you complete your repair and get your vehicle back on the road.