Quote:
Originally Posted by 87tdwagen
I would imagine that the Sprinter may have an OM606 rather than the OM603.
On the OM603, the front hub has a woodruff key clocking it to the crank. The clearance is very tight, between, the hub slot, key and crank cutout. It is possible that the key may have sheared, or is missing if the hub was pulled off and then reinstalled knocking the key into the oil pan. It's very finicky due to the tight tolerances to get the three aligned perfectly when installing. For the hub to rotate off of the crank stub in either direction, the key must be sheared or missing. The bolt and washed serve only to lock the hub onto the key and should not be affected by rotational forces.
I can't confirm if the OM606 is configured the same way, but likely, it is/has been a common practice on many engines for a long time.
Best of luck
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Excellent points.
I had a very frustrating woodruff key that was loos in the slot and every time I tried to put the hub on the key pushed out. I degreased the key and slot and I use JB weld Epoxy and on it and made sure it got back in the slot perfectly and trimmed off the excess and that worked. That was on a US vehicle.
After degreasing a really tight one super glue could be used.