NAXJA Forums -::- North American XJ Association  

Go Back   NAXJA Forums -::- North American XJ Association > NAXJA Unibody Jeep Technical Forums > Jeep Cherokee XJ (1984 - 2001) > Modified Tech Discussion
HOME Member FAQ Sponsor Info Rules Bylaws E-Mail

Modified Tech Discussion Forum for Tech related discussion for Modified XJ's and MJ's.

Reply
 
Thread Tools Display Modes
  #16  
Old January 8th, 2020, 14:30
devildog0's Avatar
devildog0 devildog0 is offline
NAXJA Member
 
Join Date: Apr 2005
Location: Hunt County Texas
Posts: 868
Crank bearings?

FSM calls for 10 at hot idle. So 12 is good to go. Ive seen less.than 10 With no engine noise.

Id stop sweating it.

Sent from my SM-G892A using Tapatalk
__________________
1995 XJ Country/4.0L/AW4/231/UpCountry Suspension
2004 Suzuki DL650 VStrom/1978 Suzuki GS1000E/2003 Yamaha TW200
1982 Suzuki GS850G (barnfind project)
Reply With Quote
  #17  
Old January 13th, 2020, 08:37
old_man's Avatar
old_man old_man is offline
NAXJA Member
 
Join Date: May 2003
Location: Loveland, Colorado
Posts: 15,826
Re: Crank bearings?

Get rid of the FRAM filter today. They have a reputation of killing XJ motors. Ask PacEd about it.

You never posted (that I saw) how thick of oil you are running.
__________________
Tom Houston - Former Colorado Chapter President, current Treasurer , Terminal Adrenaline Junkie, and Rocket Scientist
Loveland, Colorado My teardrop build
You're just jealous because the voices don't talk to you.
Reply With Quote
  #18  
Old January 13th, 2020, 09:26
cal's Avatar
cal cal is offline
NAXJA Warranty Voider
 
Join Date: Nov 2004
Location: Hammertown, USA
Posts: 17,559
Re: Crank bearings?

How has a high volume oil pump not come up? That's usually how we fix oil pressure issues.
__________________
I'm not a complete idiot - there are parts missing.
Reply With Quote
  #19  
Old January 13th, 2020, 11:17
old_man's Avatar
old_man old_man is offline
NAXJA Member
 
Join Date: May 2003
Location: Loveland, Colorado
Posts: 15,826
Re: Crank bearings?

High volume pumps on 4.0L's have a bad track record.

Remember, rod bearings have as much if not more to do with oil pressure than main bearings.
__________________
Tom Houston - Former Colorado Chapter President, current Treasurer , Terminal Adrenaline Junkie, and Rocket Scientist
Loveland, Colorado My teardrop build
You're just jealous because the voices don't talk to you.
Reply With Quote
  #20  
Old January 13th, 2020, 11:19
cal's Avatar
cal cal is offline
NAXJA Warranty Voider
 
Join Date: Nov 2004
Location: Hammertown, USA
Posts: 17,559
Re: Crank bearings?

I don't know what bad record you have had with them but I have been using them for many years both in commuters and in competition, with nothing but good results.
__________________
I'm not a complete idiot - there are parts missing.
Reply With Quote
  #21  
Old January 13th, 2020, 12:19
RCP Phx RCP Phx is offline
NAXJA Forum User
 
Join Date: Mar 2003
Location: Phoenix,Az
Posts: 13,825
Re: Crank bearings?

X10k, I've been running them in everything I build(almost), and that would be almost 10k motors!
Reply With Quote
  #22  
Old January 13th, 2020, 12:34
RCP Phx RCP Phx is offline
NAXJA Forum User
 
Join Date: Mar 2003
Location: Phoenix,Az
Posts: 13,825
Re: Crank bearings?

I will add that there is a difference between a HV and HP pump.
Reply With Quote
  #23  
Old January 13th, 2020, 14:13
old_man's Avatar
old_man old_man is offline
NAXJA Member
 
Join Date: May 2003
Location: Loveland, Colorado
Posts: 15,826
Re: Crank bearings?

Quote:
Originally Posted by RCP Phx View Post
I will add that there is a difference between a HV and HP pump.
Being an engineer working on high pressure systems, could you describe the difference between a high volume vs a high pressure pump in a hydraulic system?
__________________
Tom Houston - Former Colorado Chapter President, current Treasurer , Terminal Adrenaline Junkie, and Rocket Scientist
Loveland, Colorado My teardrop build
You're just jealous because the voices don't talk to you.
Reply With Quote
  #24  
Old January 13th, 2020, 16:00
HotBox HotBox is offline
NAXJA Forum User
 
Join Date: Dec 2019
Location: NY
Posts: 33
Re: Crank bearings?

Quote:
Originally Posted by old_man View Post
Get rid of the FRAM filter today. They have a reputation of killing XJ motors. Ask PacEd about it.

You never posted (that I saw) how thick of oil you are running.



I posted I only use STP brand filters #S16XL and also use 10w40 for all my Jeeps. I've actually never used a frame filter before, even before they had a bad reputation
Reply With Quote
  #25  
Old January 13th, 2020, 16:02
HotBox HotBox is offline
NAXJA Forum User
 
Join Date: Dec 2019
Location: NY
Posts: 33
Re: Crank bearings?

Quote:
Originally Posted by cal View Post
I don't know what bad record you have had with them but I have been using them for many years both in commuters and in competition, with nothing but good results.


Any chance you could possibly post a part number you've used in the past? I have definitely thought about used a different oil pump, mostly because my oil pan very very slightly drips and at some point will need replacing

I'm assuming I would need a high pressure as opposed to high volume
Reply With Quote
  #26  
Old January 13th, 2020, 17:19
cal's Avatar
cal cal is offline
NAXJA Warranty Voider
 
Join Date: Nov 2004
Location: Hammertown, USA
Posts: 17,559
Re: Crank bearings?

pressure is a matter of volume and the space you force it in to. they are the same thing in this instance.


I use this pump:

https://smile.amazon.com/Melling-M16.../dp/B000C4KJ5K

Originally intended for the 258. There is some clearancing involved in making it fit in the 4.0 (our sump is further back than a 258 oil pan). Detailed here:

https://www.naxja.org/forum/showpost...2&postcount=14
__________________
I'm not a complete idiot - there are parts missing.
Reply With Quote
  #27  
Old January 13th, 2020, 17:35
RCP Phx RCP Phx is offline
NAXJA Forum User
 
Join Date: Mar 2003
Location: Phoenix,Az
Posts: 13,825
Re: Crank bearings?

In the case of a oil pump it would be GPM vs PSI, HV pumps have longer gears and HS pumps have larger diameter gears.
Reply With Quote
  #28  
Old January 13th, 2020, 19:42
cal's Avatar
cal cal is offline
NAXJA Warranty Voider
 
Join Date: Nov 2004
Location: Hammertown, USA
Posts: 17,559
Re: Crank bearings?

It may be as you say.

I still want to know what issues people have had.
__________________
I'm not a complete idiot - there are parts missing.
Reply With Quote
  #29  
Old January 17th, 2020, 14:33
Weasel's Avatar
Weasel Weasel is offline
NAXJA Member
 
Join Date: Mar 2003
Location: Billings MT/Rapid City SD
Posts: 2,256
Re: Crank bearings?

Quote:
Originally Posted by cal View Post
It may be as you say.

I still want to know what issues people have had.
I read the same things and non of it makes sense to me (having issues). Reads more like old wives tales of someone that got a bad unit 35 years ago. But alot of people instantly say oh thats' a bad idea for the 4.0's - You will drain the oil pan to quickly and starve the pump!

Anyways my 00 has shown zero oil pressure for the last 2.5 years. It rattles and clanks pretty good to the point of sounding like a diesel or a pair of shoes in the dryer. Hasn't quit yet and I got a Russ B stroker for a replacement.
__________________
Just add lightness
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Gear set up great with set-up bearings, but can't fit pressed bearings back in housin thebyus Modified Tech Discussion 10 August 31st, 2015 06:34
Rear Main Seal - Crank Bearings djblade311 OEM Tech Discussion 4 November 2nd, 2010 17:30
Crank crank crank crank crank vroom gone postal OEM Tech Discussion 27 November 25th, 2006 09:47
crank-crank-crank-crank-cra... [wait...] crank-crank-START! iBran OEM Tech Discussion 20 October 21st, 2005 17:33
Rear wheel bearings (axle bearings) desertjeeper OEM Tech Discussion 5 July 13th, 2004 19:07


All times are GMT -7. The time now is 09:39.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
NAXJA and NAXJA logo's Copyright NAXJA. All content/images Copyright NAXJA 1999-2014