4.0 main bearing bolt size question

Aug 12, 2006 7 Replies
D

Hi all



I am trying to change the rear main seal in my 1997 4.0 Jeep Grand Cherokee. I have been pretty much over my head in the whole project.



In trying to remove the main cap, my 13/16 socket seems too big, and my



20mm socket won't fit on the main bearing bolt.

Does anyone know what size these are? At first, I thought the 20mm socket just needed to be deeper so I just got back from the store with a deep socket and it doesn't fit on either.



I do not have a factory manual.



Thanks in advance. Doug



Vote
Twitter Facebook LinkedIn
J

You could measure across the flats. It's a SEA (inch) engine. The next smaller from 13/16 is a 3/4"

JoBo

Vote
Twitter Facebook LinkedIn
R

I don't think you have to remove the main bearing cap. I've replaced the rear main seal in my 91 YJ and never had to remove the bearing cap. I don't think the GCs are much different in that respect.

Vote
Twitter Facebook LinkedIn
M

I really hope it wasn't just your valve cover leaking down the back imitating a bad seal. You can tell by running a clean rag across the back of the head. If it comes out wet with oil....

My main's use a 13/16 wrench. It has a 'slight' amount of play when fitted.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail >
Vote
Twitter Facebook LinkedIn
M

That would be a trick I would like to see.....

The seal is fitted 'under' the rear main bearing cap in 2 halves....

Mike

rec>

Vote
Twitter Facebook LinkedIn
R

My bad, your right, I forgot.

Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required