Not your run of the mill problem, but one that I had on my 1963 190D with A/C. The crank shaft bolt and the cast steel pulley sheared off when the a/c kicked in. The engine did not have the horses to maintain a decent idle whent he a/c turned on and shook like crazy. Ffinally failed on fatigue. I had to take the crankshaft out because the bolt was anealed into the crank. I had it drilled out and then tapped in a large allen head bolt. It worked until I sold the car. I assume you have ordered a new crank bolt from the dealer and you can then get the tap size from the bolt. Let me know how it goes.

henry

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63 190d (sold)
69 220D (sold)
69 280SL (sold)
76 BMW 2002 (sold)
86 190E-16v (Demised at Laguna Seca Turn 9)
87 300SDL (sold)
87 300SDL 135k
87 300TD 280k (sold)
95 E320W 211k
95 E320w 111k
05 C320 4matic
06 E320 CDI 90k (Totaled by a texting 19 year old girl in a nissan)
2013 GLK 250 Bluetek 4MATIC

Yes, I have the factory bolt, Buggered the threads trying to get it in, being the stubborn type. I do not want to remove the crank, for obvious reasons. I've only had this car for 4 mos, but its been great until the balancer worked loose. Bought a new one from the dealer for $220.00. This engine is tight, does not leak or burn oil, starts great. I sure do not want to have to rebuild 'er.

I'll let you know, what comes of it.