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Message: <blockquote data-quote="sdhow" data-source="post: 31671" data-attributes="member: 8099">Piston rings and timing chain guides are usually due at about 100-125k miles. Budget $3-3.5k for timing parts/labor; more for the piston rings, because you might as well do the bearings if you have the engine out. Basically, a lower end rebuild.Mine went at 126k miles. Did the timing chain/guides, put it back together and had an intermittent miss on #4 cylinder. Ended up having to take the entire engine back out to do the rings and bearings. Double the labor.</blockquote>