I agree with Glenn about the belt tensioner. Don't just go throwing parts at it now. I have never heard a chain rattle in a 103 motor but the belt tensioner we do every week.

Also as I mentioned the 103 tensioner is a ratcheting type. It will not bleed down overnight.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician