4.0L Motor Build Need Some Help.

[codymanche]

hey guess I'm trying to work on my motor its a 4.0L. i had the block boared out to fit 0.20 size pistons. The crankshaft is still stock and connecting rods are too.i have a upgraded camshaft from comp cams. i trying to put the motor back together. so i believe i have half the motor back together. i have the crankshaft, connecting rods, pistons, camshaft, freeze plugs, and i wanna say the timing is done. i have the head done in the shop. I'm looking for advice and step by step (pic by pic if possible) on how to put the motor back together. any help would be helpful and apprciated

[87Warrior]

The best step-by-step guide I came across when rebuilding my 03 TJ's 4.0 was the FSM. I have not reviewed a MJ FSM motor guide, but it should be the same as a later model 4.0.

[codymanche]

fsm stand for

[87Warrior]

Factory Service Manual.

[Comanche County]

Yeah, check the FSM for connecting rod and crank tolerances. They're very important for a smooth running engine. New bearings right, did you have the crank machined?

[codymanche]

i don't have one of those but i do have a haynes manual. and no i didnt just the head and block went to the machine shop.

[Comanche County]

If you didn't keep the bearings and the connecting rods in order and reassemble exactly as it was before you're risking spinning/burning a bearing. Might be best just to take it to a reputable machine shop and have them reassemble it for you. Should cost around 300 bones for a complete reassembly, plus any other machine work. Connecting rod, bearing and crank endplay is a precise measurement. Best not to wing it. If you removed the crank, you might as well put in new bearings, but the crank journals need to be mic'd, depending on wear, they may need to be re-ground which would require oversized bearings.

[codymanche]

I have new bearings stock and con rods are stock. When I took it to the machine shop the the guy asked if I was still using the old crank I said yes. He looked at it and said it was good.

[codymanche]

I did the same way I pulled them out they are in order