When do you replace the timing chain and tensioner for 1991 420SEL?

Go to search at up right conner"timing chain"
you will get answer.

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MB STARS Master Guild Technician,12 years MB tech
5 years independent shop owner

To day I have a 89 420sel 107542 miles tow in
with engine damaged cause by timing chain rail (was bronek) plastic pieces drop in btw chain & gear cause timing chain to jump on driver side, bent veles...guys this is not the first time I see that happen so the best
insurance is replace your timing chain,chain
rails,thesioner at 100,000 miles.


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MB STARS Master Guild Technician,12 years MB tech
5 years independent shop owner

Man what a small world...I just had a tow in with 111,000 miles with the exact same problem. Though this is not the first time I have seen this it is the lowest miles I have seen the failure.

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Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
LEAD TECHNICIAN FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM