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Old 10-04-2001, 02:15 PM
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4.2 Liter Timing Chain Questions

After having read some of the recent posts on the propensity of the 4.2 liter timing chain to break, I'm wondering if at 104K and a full documented history of synthetic oil and loving dealer service I should have it changed to prevent a possible catastrophe? What is the cost for the replacement before it snaps? Any BTDT's appreciated

Car: 1992 400SE Smoked Silver/Oyster leather
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Old 10-04-2001, 03:32 PM
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Join Date: Sep 2001
Location: Queens, NYC
Posts: 158
Doesn't MB recommend a timing chain replacement on all V8's after 100k? I would change it - but try and find someone reasonable as it isn't that urgent.
2003 S500 Black/Charcoal
1990 560SEL 61k Arctic White/Grey

1988 420SEL Black/Palomino Sold @ 85k
1987 420SEL Midnight Blue/Grey
1986 420SEL Diamond Blue/Grey
1983 380SEL Champagne/Palomino
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Old 10-04-2001, 07:54 PM
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CS, our 420S jumped timing and bent valves without any warning on a cold startup (probably had experienced some backward rotation upon shutdown the night before causing the chain to loosen up on the sprockets since the tensioner is on the other side of the engine). If the car is in good shape and you plan to maintain it, then by all means get the chain taken care of soon. Find someone that knows how, has done several and will explain to you the procedure they use.
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