Differential torque - Defender Source
Defender Source  

Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions


Reply
 
Thread Tools
  #1  
Old April 22nd, 2016, 08:47 AM
Gabriel_Laconi
Status: Offline
Gabriel
1992 Rangge Rover
Member
 
Join Date: Jan 2012
Location: Fishersville
Posts: 89
Differential torque

I just replaced all the bearings on the rear diff of my 1992 RRC. I torqued the pinion nut and its hard to move. Does anybody know the torque spec, or should it just be tight enough to remove slack...? I know there is a retaining pin, so i wonder how tight it really needs to be...

Thanks,

-Gabe.
Reply With Quote
Sponsored Links
Advertisement
 
  #2  
Old April 22nd, 2016, 09:20 AM
Ren Ching's Avatar
Ren Ching
Status: Offline
Skinny Pete
'84 90 "Yamelo"/'88 RRC "Chewbacca"
Member
 
Join Date: Mar 2007
Location: Downtown
Posts: 4,696
Registry
there is a procedure and torque settings for that, using an inch pound torque wrench and shims under the outer bearing.

If you haven't followed that procedure, you are doing it wrong.


Quote:
Originally Posted by Gabriel_Laconi View Post
I just replaced all the bearings on the rear diff of my 1992 RRC. I torqued the pinion nut and its hard to move. Does anybody know the torque spec, or should it just be tight enough to remove slack...? I know there is a retaining pin, so i wonder how tight it really needs to be...

Thanks,

-Gabe.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Present:
1960 SII 109"- "Red Square"
1984 90 Tdi- "Yamelo"
1988 RRC- "Chewbacca"
1987 RRC- "Chewy 2"
2008 RRS SC- "The Supersofa"

Past:
1959 SII 88"- "The Little Green Beastie" last seen in NY
1972 SIII 88"- "GreenHELL" now in NC
1988 90 "Eric the Half a Bee" half a truck, sold for parts
1991 RRC- never got a name- long since recycled
Reply With Quote
  #3  
Old April 22nd, 2016, 09:30 AM
Red90's Avatar
Red90
Status: Offline
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 9,249
Registry
Read the manual. The nut is meant to be very tight. The bearing preload is set by changing shims.
__________________
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
Sponsored Links
Advertisement
 
  #4  
Old April 22nd, 2016, 10:15 AM
Gabriel_Laconi
Status: Offline
Gabriel
1992 Rangge Rover
Member
 
Join Date: Jan 2012
Location: Fishersville
Posts: 89
I just keep finding contradicting info...some say tighten the nut, but too tight and i dont meet the 20-35 lbs/In. turning force...i hear a clunking noise at low speeds. If i loosen the pinion nut a bit the diff spins freely...
Reply With Quote
  #5  
Old April 22nd, 2016, 10:23 AM
Red90's Avatar
Red90
Status: Offline
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 9,249
Registry
There is zero contradictory information. READ THE MANUAL!!!!!!

The bearing preload is set with shims not by nut tightness. The nut should be very tight. You need more shim.
__________________
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
  #6  
Old April 22nd, 2016, 10:24 AM
fishEH's Avatar
fishEH
Status: Offline
Brett Fritzler
94, 95, 96 D1's
Member
 
Join Date: Mar 2011
Location: Lake Villa, IL
Posts: 1,113
You really need to follow the manual.
It helps to have setup races and a setup pinion nut(non-nylock or worn-in nylock). You need to add/remove shims and torque the pinion nut to spec, then check the preload with an INCH/lb beam torque wrench. Once you get it dialed in install your final races and torque a nylock pinion nut to spec. All that is after you check you gear pattern, of course.


You can make set up races by taking a new race and grinding a little off the outside, just enough so you can drop it in and take it out without tools.
Reply With Quote
  #7  
Old April 22nd, 2016, 10:43 AM
Gabriel_Laconi
Status: Offline
Gabriel
1992 Rangge Rover
Member
 
Join Date: Jan 2012
Location: Fishersville
Posts: 89
I guess i dont understand what keeps the pinion bearings from binding when i tighten the pinion nut. The shims wont prevent the bearings from crushing...im used to diffs with crush sleeves, and this one doesnt work that way...
Reply With Quote
  #8  
Old April 22nd, 2016, 10:48 AM
Red90's Avatar
Red90
Status: Offline
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 9,249
Registry
Quote:
Originally Posted by Gabriel_Laconi View Post
The shims wont prevent the bearings from crushing..
Yes they will. Look closer at how it works.
__________________
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
  #9  
Old April 22nd, 2016, 10:53 AM
Red90's Avatar
Red90
Status: Offline
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 9,249
Registry
Here is the cross section. Perhaps it will be clearer. The manual is very clear and takes less time to read than me typing this post....
Attached Thumbnails
Click image for larger version

Name:	Untitled.png
Views:	34
Size:	41.9 KB
ID:	147821  
__________________
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
  #10  
Old April 22nd, 2016, 11:05 AM
Gabriel_Laconi
Status: Offline
Gabriel
1992 Rangge Rover
Member
 
Join Date: Jan 2012
Location: Fishersville
Posts: 89
Which shims are we talking about? The ones under the inner bearing race? Or the ones between the pinion and outer bearing? If we are talking about the ones under the inner bearing, ill be throwing the whole thing away...
Reply With Quote
  #11  
Old April 22nd, 2016, 11:16 AM
Red90's Avatar
Red90
Status: Offline
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 9,249
Registry
I give up.
__________________
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
  #12  
Old April 22nd, 2016, 11:25 AM
mongosd2's Avatar
mongosd2
Status: Offline
Frank Rafka
01 D2 96 D1 83 110
Member
 
Join Date: Jul 2010
Location: Tucson
Posts: 861
read this:
Differential Installation Instructions | West Coast Differentials
Reply With Quote
  #13  
Old April 22nd, 2016, 11:27 AM
Gabriel_Laconi
Status: Offline
Gabriel
1992 Rangge Rover
Member
 
Join Date: Jan 2012
Location: Fishersville
Posts: 89
Quote:
Originally Posted by Red90 View Post
I give up.
Look, im really sorry im not up to your level of expertice. I find myself in need of help, if you just have this urge to be an ass just move along, ok? I know you are frustated by noobs, but imagine how i feel not knowing what to do and on top having to deal with your condecendig comments.
Reply With Quote
  #14  
Old April 22nd, 2016, 11:32 AM
Red90's Avatar
Red90
Status: Offline
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 9,249
Registry
Read the manual. It is simple and clear there and is all of two pages. You do not need us to write out the manual for you. Land Rover did that for you.

You come on here asking for help. It is given and you disregard the help given and then complain and continue asking the same questions that have been answered. Read the manual FIRST. If it is not clear then ask for clarification.
__________________
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
  #15  
Old April 22nd, 2016, 11:46 AM
Gabriel_Laconi
Status: Offline
Gabriel
1992 Rangge Rover
Member
 
Join Date: Jan 2012
Location: Fishersville
Posts: 89
I have the manual. I read it, i set the diff. If i tighten the pinion nut "very tight" the pinion binds up. So what i need to know is just WHAT is "very tight" im sure there has to be a value out there, i just cant find it on the manual. I heard 100 ft/lbs online, pinion WILL NOT move if its that tight...
Reply With Quote
  #16  
Old April 22nd, 2016, 11:51 AM
mongosd2's Avatar
mongosd2
Status: Offline
Frank Rafka
01 D2 96 D1 83 110
Member
 
Join Date: Jul 2010
Location: Tucson
Posts: 861
Are you installing any shims and proper torque…all the info you need is in the manual

if you torque to spec and it doesn't move, your pre-load is fucked
Reply With Quote
  #17  
Old April 22nd, 2016, 11:53 AM
Red90's Avatar
Red90
Status: Offline
John B.
1991 Defender 90, 200TDI
Site Team
 
Join Date: Sep 2003
Location: Calgary
Posts: 9,249
Registry
Pinion nut torque is 70 to 120 lb-ft.

This is the instruction for setting bearing preload. The shims are at location 54 in the sketch above. You torque the nut. If the preload is too high, you install a thicker shim and try again. Keep changing shims until the preload is correct.

Section 51, page 7.
Quote:
58. Tighten the pinion flange nut to the specified torque (see section 06-Torque values). The force required to rotate the pinion shaft should be within 23 to 40.25 kgf cm (20 to 35 in lb) using new bearings, when initial inertia has been overcome. Change the bearing pre-load shim as necessary to obtain this requirement. A thicker shim will reduce pre-load; a thinner shim will increase pre-load.

NOTE: If using original bearings, which are bedded in, the pre-load figure is 11.5 to 17.25
kgf cm (10 to 15 in lb)
__________________
Pissing people off on the "net" since 1983.

Land Rover. Turning owners into mechanics since 1948.
Reply With Quote
  #18  
Old April 22nd, 2016, 12:05 PM
Gabriel_Laconi
Status: Offline
Gabriel
1992 Rangge Rover
Member
 
Join Date: Jan 2012
Location: Fishersville
Posts: 89
Quote:
Originally Posted by Red90 View Post
Pinion nut torque is 70 to 120 lb-ft.

This is the instruction for setting bearing preload. The shims are at location 54 in the sketch above. You torque the nut. If the preload is too high, you install a thicker shim and try again. Keep changing shims until the preload is correct.

Section 51, page 7.
Thats more like it. I finally have a value to go by. Sucks i need more shims, but at least i know what im looking for. Thank you.

------ Follow up post added April 22nd, 2016 12:08 PM ------

I was reusing the original shims and they seemed so thick i was hoping they were still ok...
Reply With Quote
  #19  
Old April 22nd, 2016, 12:27 PM
sonoronos's Avatar
sonoronos
Status: Online
Ed
None
Member
 
Join Date: May 2010
Location: Arlington, VA
Posts: 5,544
Registry
Gabriel, when you said, "I have the manual. I read it, i set the diff" it seems a bit odd when John just copied and pasted the manual you claim to have read, and you all of a sudden have a revelation.

Whether you realize it or not, it takes time and effort for people to do work for you.

It's clear that you didn't read the manual, and you just straight up gave a middle finger to everyone in this thread who told you to read the manual. Think about that.

That said, I don't think you have any idea how to set up a diff. Since it's obvious now that you haven't actually read the manual (looking at words is not considered reading), I suggest you go back and make sure you set the carrier bearing tension, diff gear contact pattern, and pinion preload correctly with an in-lb torque wrench.

If you do not do these, your diff is pretty much lunch. If you say you already did, I doubt you, since it's obvious you didn't read the manual.
Reply With Quote
  #20  
Old April 22nd, 2016, 12:47 PM
Gabriel_Laconi
Status: Offline
Gabriel
1992 Rangge Rover
Member
 
Join Date: Jan 2012
Location: Fishersville
Posts: 89
The revelation came from an actual torque value and location of shims that need to be replaced. None of which are specified on the manual. If i dont know what "preload shims" are, i will not understand, just reading the manual, where they are located. The "preload shims" on my pinion are more like thick ass washers, so i consider them more like spacers. I didnt know what they were called. I apreciate the help, but if you have no time, dont feel obligated...
Reply With Quote
Reply

Lower Navigation
Go Back   Defender Source > Defender & Series Technical Discussions > Defender Technical Discussions

Tags
differential

Thread Tools

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Differential Craigd Defender Technical Discussions 5 April 22nd, 2007 08:56 PM
SG winch bumper, GKN torque limiters, OME 751 springs Shane@EVS For Sale - Parts 24 June 1st, 2006 02:37 PM
torque flippedrover Defender Technical Discussions 12 May 21st, 2004 01:03 PM
New differential questions... wicks Defender Technical Discussions 15 May 5th, 2004 11:39 PM
Differential with 5 k miles on it for sale. PhilDes For Sale - Parts 0 January 28th, 2004 09:21 PM


All times are GMT -5. The time now is 04:19 PM.


Copyright