Thread: Main Bearing Issue

Finally assembling my det engine, and my crankshaft is seizing when i tighten up my main bolts. What could be the possible cause??

putting something in a bind...you have assembly lube on everything right? You check the journals with plastigauge?

idk what it is to be honest. its a de crank in a det motor

Are you using factory bolts or studs?

new factory gtir bolts

If there is plenty of assembly lube on the crank and bearings and its not wanting to turn when you tighten them down then either the following is happening or the problem:

Wrong size Bearings...What bearings are you using and are they the standard size or oversize. If they are oversize, that is the reason.

Warped or bent crank...Usually from storing it wrong/having it resting on its side or tetering on something to where it can flex/bend.

Warped block...If the block has been overheated

Or you dont have the main caps on the right way or the main caps arnt from that motor....The main caps for a motor go with the motor they came with and cant be used on any other motor unless you get it line bored.

So now spill it....Which one is it

now that i look at it im using the wrong set of main caps

Theres your problem. lol. Top of the numbers point at the front of the block/timing chain side. Easy way to remember.

I was gonna say your caps are wrong but you figured it out lol