Question about 1995 Mercedes-Benz S-Class

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Knockin in the engine

I have a mechanic that says to check out the knocking in my engine that he would have to take off the head of the engine. 5 hours to take of off and 5 hours to replace it. Thus, 10 hours of labor to just check out the noise. This seems excessive. What is usually the labor involved to remove the head. The mechanic has done a compression test and it pased. He is saying I might have to replace the engine. Could this be something minor? Treated by some different oil to lubricant valves and lifters to stop the knocking?

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Hello, There is usually a book the garages use called a "Flat Rate Repair Manual". This book is suppose to detail the procedures for the repair and give the mechanic an idea of what to charge.
This means if you call around, you can get a time estimate(multiply by hourly rate) of the labor.

Yours is one of those cases where there is not a diagnostic device to predict the problem and you need an old school mechanic to listen to the engine. Someone who is experienced can tell you what the problem is before opening the motor.

If you have a "rod knock", you have to go through the oilpan and/or pull the motor and you can get away with working on just the one cylinder thats bad. But the good news is if the noise is a hydraulic lifter and you have an overhead camshaft engine some of the parts are more accessible. You would not need to pull the head.

You are in a tight spot. To check out more prices use the telephone. The repair places need to hear the car before they can say much. If it is a hydraulic lifter sometimes STP can help. The 10 hours does sound extreme unless that would go to pulling the motor. Tell the current shop you can not pay for bad guesses and have them explain what part they intend to replace.

Posted on Jul 03, 2009

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Posted on Jan 02, 2017

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