Got one better. This is back when I was 16 and a diesel mechanic. I was doing a in frame rebuild on a cab over rig. Well we got it all back together.... cranked it up and we heard a knocking sound. We listened all over the transmission and block and it sounded like it was coming from the flywheel area. So we pulled the tranny back out dropped the clutch and fly wheel but there didn't seem to be anything wrong with either. So we put it all back together and same thing. We took it all apart again and sent the flywheel to be turned and got a new clutch. The fly wheel came back and we put it together again. Well by this time it is like 9pm and the boss comes out. (The truck was suppose to be done 8hrs ago and at this point there are 4 people working on it) He slides under the truck and listens and says to drop the oil pan. I did it and he slides under again and tells me to slide under with him. He reaches up and finishes screwing in a main bearing bolt. I felt like a dick. In my defence people were fing with me while I was tightening them (poping my legs with rags etc) so I guess I over looked a main bearing cap. Oh well live and learn.
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