Quote:
Originally Posted by engatwork
Got a customer with a 99 E300 with 305k miles. The head has never been off of the car. I have recommended to him that over the next 50k miles or so we replace the timing chain and guides/tensioner slides, etc..... To do the job correctly, in my opinion, requires the head to come off. I recommended having a head shop go through the head at the same time. Obviously this is a pretty involved job. I hate to see him run it to failure and mentioned to him that it would eventually need a new head gasket during which time would be ideal to change the chains, guides and slides. Oil changes have always been with synthetic oil.
Any thoughts/comments regarding how far anyone has run one out till the oil pump chain tensioner failed? The car starts easily and runs out good.
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I would recommend to leave everything alone except the timing chain if one is really concerned. To answer your questions.
1) head does NOT need to come off to change the oil pump or timing chain,
2) Engine face plate + head need to come off for tensioner guide or slide.
3) Anything would fail eventually..., including head gasket. The issue is when?
If the customer is concerned and has a deep pocket then change everything.