Crankshaft (pulley assembly) Compatibility
 

Issue: Crank bolt backed out and went MIA during use. Problem locating compatible replacement hardware.

I do know that I can use the crankshaft bolt from most w124 and w140 chassis cars as well as some w126's, etc
I know the following models have the bolt I can use: OM603.912, .913, .950, .960, .961, .962, .963
all OM606 models
M107.99x Petrol Engines.

I have not made progress using any of our parts sites nor with local parts/yards as i'm only running into complete engines where only option is buy the whole engine if I want the bolt.
However I have found 1 crankshaft bolt that was removed from an OM603.971 Engine. I have not confirmed if it will fit and thus I havent made a move on it.

All in all, what's your $.02 on this $30 bolt?

Call Pelican Parts for a new one. Get a new stack of Belleville washers too.

Sixto
98 E320s sedan and wagon

You didn't bother to tell us your car and engine. Find the size of the bolt and buy it from a normal bolt source. Ace Hardware may have metric bolts that size, and buy grade 8 if possible. Re size, for my OM617.952 engines, I recall the crank bolt takes a 30 mm socket and is a normal hex head size for that diameter, so might work your way back from that. But, don't quote that since long time since I turned the engine over w/ the crank bolt (now use p.s. pulley) and 32 mm socket seems familiar too (a search should find it). I recall it is a fine thread, but I also recall that metric bolts have 3 thread pitch choices.

If you lost the bolt, you likely lost the cupped washers too, and they are rarer. Also, be very careful when re-installing the crank damper, as you can fairly easily mess up the 2 round keys on the crankshaft end, thus ruining it. The two slots are not exactly 180 deg apart, so the damper fits at only one angle. Use a mirror and insure you have it clocked correctly.