rear main? crank bearings? - Great Lakes 4x4. The largest offroad forum in the Midwest

Go Back   Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Jeep Tech
GL4x4 Live! GL4x4 Casino

greatlakes4x4.com is the premier Great Lakes 4x4 Forum on the internet. Registered Users do not see the above ads.
Search
Reply
 
Thread Tools Search this Thread
Old March 9th, 2006, 08:23 PM   #1
brewmenn
Grumpy old man.
 
brewmenn's Avatar
 
Join Date: 11-05-05
Location: Inkster, MI
Posts: 10,579
iTrader: (9)
Mentioned: 1 Post(s)
Default rear main? crank bearings?

I think my rear main is leaking so I'm probably going to need to replace it.

I've heard that with the 2 peice design that it can usually be replaced without dropping the crank, but that it's easier if you do, and I've also been told that worn out main bearings might be the cause of my occasional low oil pressure at idle problem, so I'm thinking about replacing those to.

So whats all involved with doing this besides the obvious? (unbolting a bunch of stuff and bolting it back together with new parts) Any special tools or skills required? and what else should I think about replacing or upgrading while I'm in there?
brewmenn is online now   Reply With Quote
Sponsored Links
Advertisement
 
Old March 9th, 2006, 09:08 PM   #2
Chop
Mischievous Badger
 
Chop's Avatar
 
Join Date: 11-05-05
Location: Fenton Mi
Posts: 5,834
iTrader: (31)
Mentioned: 3 Post(s)
Send a message via AIM to Chop
Default

after you take the oil pan off you take the rear main bearing cap off. One piece of the seal is in the cap and the other is wraped around the crank you can use a small punch to tap it around the crank and it will slide around so you can take the seal out. just be carefull when useing a punch around the crank. as for the main bearings that requires a lot more work read a repair manuel to get a better idea. also for the main bearings pulling the engine out and rebuilding it would be the best

Last edited by Chop; March 9th, 2006 at 09:10 PM.
Chop is offline   Reply With Quote
Old March 13th, 2006, 10:51 PM   #3
mudd_jumper
Senior Member
 
mudd_jumper's Avatar
 
Join Date: 11-20-05
Location: Macomb Twp,MI
Posts: 5,126
iTrader: (9)
Mentioned: 0 Post(s)
Default

Quote:
Originally Posted by Jeepinlunatic
after you take the oil pan off you take the rear main bearing cap off. One piece of the seal is in the cap and the other is wraped around the crank you can use a small punch to tap it around the crank and it will slide around so you can take the seal out. just be carefull when useing a punch around the crank. as for the main bearings that requires a lot more work read a repair manuel to get a better idea. also for the main bearings pulling the engine out and rebuilding it would be the best
mine was the two piece did it was easy couple hours and good to go!
mudd_jumper is offline   Reply With Quote
Old March 13th, 2006, 11:03 PM   #4
Sonicjay
Senior Member
 
Join Date: 11-05-05
Location: around
Posts: 2,566
iTrader: (16)
Mentioned: 2 Post(s)
Default

The rear main is fairly easy. Rocky and I did mine a couple months ago while changing the oil pump and what not. As stated above, no need to pull the crank; just the oil pan (and exhaust collector on 2000+) and rear main bearing cap.
Sonicjay is offline   Reply With Quote
Old March 14th, 2006, 09:48 PM   #5
Outdoors
Field Repairs
 
Outdoors's Avatar
 
Join Date: 02-08-06
Location: Stevensville
Posts: 164
iTrader: (0)
Mentioned: 1 Post(s)
Default

The rear seal is easy, pulling the crank on an installed engine is difficult to say the least. If you elect to pull the crank to replace the bearings, find a hose the correct size to cover the threads on all of the connecting rods before pushing them out of the way. If you nick the crank you will have a bigger problem than you already have. Then again, I'm just a NEWBIE around this forum.
Outdoors is offline   Reply With Quote
Old March 15th, 2006, 10:12 AM   #6
xjmichigan
Senior Member
 
xjmichigan's Avatar
 
Join Date: 11-05-05
Location: Plymouth
Posts: 4,331
iTrader: (16)
Mentioned: 1 Post(s)
Default

http://madxj.com/MADXJ/technical/tec...nebearings.htm
xjmichigan is offline   Reply With Quote
Old March 15th, 2006, 01:55 PM   #7
farm_boy
hicktown
 
farm_boy's Avatar
 
Join Date: 12-08-05
Location: holland mi
Posts: 2,433
iTrader: (6)
Mentioned: 0 Post(s)
Default

Quote:
Originally Posted by brewmenn
I think my rear main is leaking so I'm probably going to need to replace it.

I've heard that with the 2 peice design that it can usually be replaced without dropping the crank, but that it's easier if you do, and I've also been told that worn out main bearings might be the cause of my occasional low oil pressure at idle problem, so I'm thinking about replacing those to.

So whats all involved with doing this besides the obvious? (unbolting a bunch of stuff and bolting it back together with new parts) Any special tools or skills required? and what else should I think about replacing or upgrading while I'm in there?
ok low presure is ture but i wholud run it until it dies and two pice pull oil pan and replace
farm_boy is offline   Reply With Quote
Old March 15th, 2006, 02:00 PM   #8
xjmichigan
Senior Member
 
xjmichigan's Avatar
 
Join Date: 11-05-05
Location: Plymouth
Posts: 4,331
iTrader: (16)
Mentioned: 1 Post(s)
Default

run it till it dies.. and costs 1000 more to rebuild it if you wait?

it cheeper to fix it now

i replaced my crank bearings and rear main. after 10,000 miles it has a slight leak but i got my oil pressure back to normal 20 psi at idle

Last edited by xjmichigan; March 15th, 2006 at 07:40 PM.
xjmichigan is offline   Reply With Quote
Old March 15th, 2006, 07:20 PM   #9
Sonicjay
Senior Member
 
Join Date: 11-05-05
Location: around
Posts: 2,566
iTrader: (16)
Mentioned: 2 Post(s)
Default

My oil pressure drops to 0 pretty much everytime I come to a stop when the engine is warmed up. I replaced the rear main seal, oil pump, and sending unit, and it still does it..
Sonicjay is offline   Reply With Quote
Old March 15th, 2006, 08:52 PM   #10
Kawierider
Senior Member
 
Kawierider's Avatar
 
Join Date: 01-29-06
Location: Livonia
Posts: 1,533
iTrader: (2)
Mentioned: 0 Post(s)
Default

did you try a mechanical gauge J?

I have heard that the rear cam bearings tend to go quick on the 4.0 since they dont get much oil.

If I was gonna go through the trouble of replacing the mains i'd put a high volume oil pump in at the same time. You most likely dont even have to do the mains. When you pull your cap off to do the seal check out how the bearing looks. if it looks like material has scraped off, or there is debris in there, or the journal or the bearing looks like it has grooves in it then it might be worth doing the extra work.

be ready to get dirty. all the oil residue will be dripping on you the entire time.
Kawierider is offline   Reply With Quote
Reply
Great Lakes 4x4. The largest offroad forum in the Midwest > 4x4 Talk > Jeep Tech

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 03:18 PM.


Powered by: vBulletin, Copyright 2000 - 2012, Jelsoft Enterprises Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd. Runs best on HiVelocity Hosting.
Page generated in 1.03932 seconds with 50 queries