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There is only 1 MB engine that MB suggested close inspection & replacement of the timing chain..the 1981-83 3.8L V-8 engine.
WHAT MB says on all other cars is to inspect the timing chain for stretch any time the valve cover(s) is removed.
More than 4-5 degrees of stretch on a GAS motor & the chain should be replaced.
And more that 3 degrees on a diesel motor.
YES the tensioner is the MOST common problem that causes the chains to stretch & break. Any plastic rail should be replaced!
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MERCEDES Benz Master Guild Technician (6 TIMES)
ASE Master Technician
Mercedes Benz Star Technician (2 times)
44 years foreign automotive repair
27 Years M.B. Shop foreman (dealer)
MB technical information Specialist (15 years)
190E 2.3 16V ITS SCCA race car (sold)
1986 190E 2.3 16V 2.5 (sold)
Retired Moderator
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