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1991 240 DH engine knocks when starting/driving cold 200

posted by  someone claiming to be Rhys on  Fri Dec 24 14:17 CST 2004 [RELATED]

If the engine has ever been overheated, or sometimes when even not, it may have developed a slightly collapsed piston skirt. This is very common on the B230 engines, particularly the turbos. I have several customers with engines that produce a "diesel" like knock when cold, which goes away in a few minutes as the piston heats up and fits the bore more closely. If the engine burns no oil, then the knock is mostly benign. Drive the engine very gently while it is knocking, and you may get many more miles out of it.
If it was a conrod or main bearing, it would get worse very quickly. On the very early B230 it could be the thrust washers on the center main bearing, but as your engine is a later version the thrust washer main was re-designed and gives little trouble.
Don't consider putting diesel fuel in the oil however. Use 10W-30 or when warmer, 15W-40 only.





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