Cummins 4B 3.9 Overhaul

Overhaul of a Cummins 4B or a 4-390 Case 580 Super K backhoe engine. A bolt came out of the timing cover and locked up the gear train. That intern spun the crank gear on the crank itself, broke the camshaft in two pieces, choppier a tooth off of the cam gear, broke four lifters. and bent 4 pushrods.