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Old 03-01-2015, 12:40 PM   #4
Jake Raby
Engine Surgeon
 
Join Date: Aug 2008
Location: Cleveland GA USA
Posts: 2,425
Sounds like the chain adjuster is failing. Get some diagnostics on it before you go mechanically inside. If the timing is 25* out, the adjuster has failed. The other possibility is severely worn chain wear pads on the chain adjuster.

This is if its a 5 chain engine.
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