The three main problems are less precise valve control, cam timings that are off, and increased chain slack within the valvetrain. When an engine is run with a worn timing chain engine performance is compromised and the likelihood of related failures is greatly increased (think chain tensioner). When the pins wear they become smaller and their mating holes grow larger leading to increased clearances and chain length. Instead, the pins and rotating elements of the chain wear. Before I get into it, one misconception I want to clear up right away is that the timing chain doesn’t technically stretch. Luckily, they are not subject to dirt and mud, are bathed in an oil bath, and their overall environment is much better. Just like the drive chain, timing chains elongate, fatigue, and wear out. I want to discuss and share with you some signs that the cam chain is worn out. This week’s post is dedicated to an engine part that is often overlooked, its importance not totally understood, and its service specs minimal.
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