Main Bearings!! Install????

[Injected1]

Has anyone ever swapped main bearings with the motor in the truck? I did rod bearings in the truck today and it is still knocking. My next best guess is main bearings. Anyone ever done it with the motor in the truck?

thanks, Nick

 

[Don W.]

Re: Main Bearings!! Install????

Nope, but I'm fairly sure it can be done. Did you find a bad rod bearing? If so did you mic the crank? I would guess it's one of the two center mains IF it's a main bearing. Could be broken rings, cracked piston to name a couple of other possibilities.

 

[sly dvl]

Re: Main Bearings!! Install????

I'm no expert, but I've never heard of a main causing a knock. How is the crank supposed to move up & down to create the knock, unless ALL the bearings are out of it. Just my :2cents: