Quote:
Originally Posted by ROLLGUY
This engine had less than 100,000 on it, and was run low on oil. I am sure it is #2 and only #2 that is the problem, as the knock goes away when the injection line is loosened. I can't imagine that the oil pump shaft would go bad that soon, or cause a knock.
Also, I have not checked the stretch on the bolts. I have been using the proper torque (35 ft lbs + 90-100 degrees additional rotation).
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Just saying, Those need to be checked so you can rule them out. I think Mercedes has had a reliability issue with those types of pumps, hence they went to a chain driven unit on the later turbo models. That pic of the pump was from a factory low mileage reman motor.