Should I replace the chain at 90k miles. I don't see much if any slack at all....but I have a brand new chain with the guide....

I have the head off and its sitting there until I get it back from the machine shop. In the mean time should I replace it for good measure seeing as I have a new one or leave it alone?

How long do you think it should take me from here?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

You may not want to change the chain, but you sure do want to reset the tensioner...

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A Dalton

As Arthur said....Chain tensioner needs removed and reset. Personally I would, although I have seem them go 200,000 or more.

With the head off it is a real easy job. ...as is the guide.
HOWEVER...after I did my own, I now have a slight whirring noise at idle.

I have re chained about 60 or 70 Mercedes over the years...perhaps more, but never got this noise from a 103 engine before.


.

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[http://languageandgrammar.com/2008/01/14/youve-got-problems-not-issues/ ]

"A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."

I have both the chain and guide. I understand the guide is the cause of the chain going bad. Should I just replace the guide and reset the tensioner? Or just do it all?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

I wouldn't on an M103, maybe at 250k do the rails

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

Took a good look at the chain today...It looks perfectly fine....but look at this guide (tensioner guide = name?)



Replace or is this normal?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

If you already have the timing chain cover removed, I would change the rails. It was a bit of a pain to get mine removed. At almost 200K, mine did not look bad but if you are in there already........

I replaced the guides on my car the last time I did the head gasket. You need to removed the front engine cover. Be ready to use a breaker bar to remove some parts. Do a search. I am glad I did. The guides are plastic and mine where crumbling in my hands when I took them out. Add an extra day to you current repair job.

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J.H.
'86 300E