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I don't think I have ever heard a timing chain make noise in a 103 motor. The tentioner is a ratchet type so it doesn't get loose with lack of oil pressure.
As was stated listen to the motor when cold with a stethescope or a long think screw driver placed to ones ear. It will amplify the noise. If you are lucky you will be able to narrow the sound down to one rocker assembly. I would the replace all the lifters in that assembly at least.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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