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I don't have an answer. But, are you sure that the noise is not from the Vacuum Pump having issues.
You also might want to remove the valve cover and inspect the full length of the chain for pins coming out and or damage to gear teeth.
When I had a sound that sounded like a timing chain sound I found that the upper chain guide that is on the drivers side was loose and rattling. See number 89 in the attached picture.
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84 300D, 82 Volvo 244Gl Diesel
Last edited by Diesel911; 12-06-2019 at 02:25 AM.
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