Broken Bolts = Cobalt bits

Broke a main bearing bolt off today and it laughed at my drill bits. Went and bought some Dewalt Cobalt drill bits and I will never drill metal again without them! Was so happy that it worked I thought I would tell everyone.

Stupid question. How did you break a main bolt?????

old_man said:

Stupid question. How did you break a main bolt?????

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Torquing down the new bearings and I had one bolt hole that I must not have gotten all the oil out of it, oil no compress, whammo! I have done it before on another motor, but must not have learned my lesson.