PeachParts Mercedes-Benz Forum - View Single Post

tcane · #7 02-14-2002, 03:31 PM

William:

You're saying that the only thing connected to the crankshaft is the oil pump? Do you have the big end of the rods disconnected and/or removed from the block and the crankshaft bearing caps off? Or, do you mean the timing chain is off and the crankshaft is no longer connected to the cam, but the lower end is assembled with the rods connected and the crank main bearing caps in place?

Removing this engine is pretty straight forward - the procedure in the Haynes manual explains the process very well. In my opinion, the hardest part was removing the self-locking nuts on the flex disc where the driveshaft connects to the trans.

A junkyard engine could be a replacement option, but you don't know what you're getting and I would think a TDI should be done to see what you have before installing a junkyard engine. Unless, you can find a junkyard that will give you a warranty that the engine is OK (with a higher price and a limited warranty like 30-60 days, perhaps 90) that they either checked out the engine (compression test, listen for bearing knocks, and other inspection procedures) or it was a wreck and the engine operated OK.

Also, the engine you have may be the best option for a rebuild if, for example, the problem is a bent rod or two. When the timing chain jumped that many teeth (assuming you had bent valves) there is a good chance a rod(s) were bent - even if there were not any bent valves (unlikely) some valves probably struck the pistons causing one or more rods to bend. That said, your description says the problem only occurs when the engine approaches TDC, but which cylinder and which stroke - intake or exhaust? Or, is it TDC for all cylinders? Or, is there one valve that is slightly bent that is causing the problem as it jams in the valve guide when the cam tries to move it?

Tom