W 250 Pickup L6-359 5.9L DSL (1989)
Crankshaft: Description and Operation
CRANKSHAFT AND MAIN BEARINGS
The crankshaft is a balanced, forged steel unit with 7 main bearings. The lower bearing shells are all the same. All of the upper bearing shells are
also the same with the exception of the journal adjacent to the rear one. The next to the last journal is fitted with a flanged upper bearing shell. The
flanges control the end thrust of the crankshaft.
The upper bearings have three holes in them. The middle hole receives oil from the main oil rifle. One of the adjacent holes is aligned with a
drilling to the camshaft journal and serves as an orifice for lubrication flow to the journal. The other adjacent hole supplies oil for piston cooling.
The hole does not align perfectly with the cooling nozzle. The hole is off-set to keep the nozzle from dropping Into the crankshaft oil supply
passage.
NOTE: Oversize service main bearings are available for reground crankshafts.
