First, get the zone rep information. Tell them it is "just in case".

Then let them know that you have been chasing a problem and the dealer isn't performing Mercedes Benz diagnostic procedure. They are changing parts, not diagnosing or testing what can be tested.

For example, why did he not check valve timing before changing the chain? Changing the chain to a double row is good precaution. I read about one going out in 25000 miles. But, it may not do anything about the idle problem. Why change it before it's running okay.

Offer to fax MB all the repair tickets and ask if the work is appropriate. Let them know you have friends who are mechanics and have a keen interest in the outcome. They should know that if they try to lie, you will know.

Last but not least, tell them that the dealer said a new timing chain would fix the problem, which you didn't believe in the first palce. They agreed not to charge you if it didn't cure the problem. Then when they broke a guide they are trying to make you pay for the whole thing. It's not right. You feel they are trying to scam you.

If the guide was broken before they started, then they could put it all back thge way you had it and it would run until you get it to another shop. Tell the dealer to put it back together and run the motor. THey will freak if they broke the guide because you motor would probably blow up. (Piston and valve interference.)

It's not an easy problem now that they have opened it up. Under normal circumstances you would be responsible for parts and labor to fix any additional proplem uncovered during the repair. Your only leverage is that you told them you wouldn't pay if it didn't fix the problem. It may not help you if they deny you said it.

You will need the zone rep.

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Steve
1985 Mercedes 500SL Euro (Gray market)
1995 BMW 520i Euro (Gray market)
1992 BMW 525it Wagon
1994 Honda Del Sol Si