Timing belt/chain replacement

A timing chain is kept under proper tension by a chain tensioner. A chain tensioner could be operated by a spring-loaded mechanism or oil pressure.

Chain guides and silencers are used to keep the timing chain from vibrating. All these components wear too. How do you know if the timing chain is worn? Often, if the timing chain is worn, the engine may feel sluggish, low on power or have trouble starting. The Check Engine light might come on too. This is because as the chain wears out, it stretches and the ignition and valve timing becomes more retarded. A worn timing chain, guides or chain tensioner can also cause a variety of noises originating from the timing chain cover area of the engine. The timing chain noises can range from rattling to whirring, whining or buzzing.

To avoid timing chain problems you should maintain your engine properly and have the engine oil changed at recommended intervals. Using premium quality engine oils and oil filters will also help. Keeping the proper oil level will ensure that the timing chain is always lubricated. In a well-maintained engine, a timing chain can last up to 300,000 miles or even longer.