gwood83

Has anyone had to deal with their engine chain needing to be replaced yet? Dealer tried to put tensioners in but that didn't work at $1,500, but came back and said the whole chain needs to be replaced $6,900...Out of warrant so that's not going to happen engine is at 120K miles.

I get my car serviced at the dealer and this seems ridiculous to be having major engine trouble.

Mikeki7

Usually when the tensioners need to be replaced then so does the chain. At 120k miles the chain will have definitely stretched and will just wear the new tensioners prematurely. What are your current symptoms? Is there a loud ticking?

gwood83

Just engine rattle during cold startup that lasts for about 5 seconds then goes away. Service bulletin says replace tensioners and check valve. Either they didnt do the service right or the chain quality is just not that great. Seems like the engines sucks if you have to dump $7K in it at 120K miles for such an expensive vehicle already. Tensioners I get but the whole chain is not acceptable at $7K.

TTMBCLS

had mine tensioners at 68k ..i had chain noise on down shifts but i added oil and the noise went away

bmwtomercedes

129k miles thats about it

lrahardj

According to this article that I found, it says... "On a cold start, owners of vehicles equipped with the M278’s V-8 engine might be concerned with a noise that sounds like a bearing problem. The noise can be heard during cold starts because the idle speed is increased and the waste gates are closed, ensuring increased heating to the catalytic converter’s operating temperature – an emissions-reduction strategy. The noise never lasts for more than 30 seconds and is normal."

See this article about CLS550 M278 engine:
https://starfest2016.mbca.org/star-a...s-benz-engines