View Full Version : Jag rear end question

05-08-01, 10:28 PM
Had to pull a diff output shaft today to cure an oil leak. D**m nuisance since the sun was shining! Also not the easiest thing to do with the diff in the car.
Diff is Mk111.
My question is this - now that I have pulled apart the offending output shaft/bearings/seals etc, I note in the book that you have to be ever so careful setting the preload on the bearings (collapsible spacer etc). The book says to pull up the adjusting nut untill the torque required to turn the shaft increases by 5 lb ins - yes inches. It also makes a point of telling you that is very easy to go too far, then you have to start over with new collapsible spacer etc.
Anyone know an easy way to set this up??


05-08-01, 11:03 PM


05-08-01, 11:12 PM
I would speak to Ed at Ward Engineering
He sorted my LS Diff out for me and quite reasonable.

18-08-01, 01:13 PM
Had the same problem. I spoke to heritage, my local Jag specialist. They informed me that it is acceptable to mark the nut and then replace with a slight tightening beyond the mark. Not scientific but I did this and to date +1500 mls I've had no problem. It depends whether you marked the nut prior to removal. Sorry I cant help further, best of luck.

18-08-01, 01:55 PM
Mike - thanks for your input. I didn't mark the nut, since, having thought about it, it was unlikely that the new bearings would go into exactly the same place as the old ones. I just pulled the nut up until all endfloat was gone, then give it a "bit" more, about 1/4 turn. Boy it was tight - deforming that cooapsible spacer takes a bit of grunt. Ended up clamping the nut in my f***- you vice and used a broom handle between the output side studs. A bit of a fraught operation. Worst part was, having put it all back, with now no leak from the shaft, I found another leak from the diff cover plate seal - had to take all that off and replace it.
Evn worse. having done that, I found I had to do up the drain plug within an inch of it's life to stop that leaking!

I'll never know if the original output shaft was leaking or not!!


18-08-01, 02:38 PM
Nice one
Tell me, do Real Steel supply the f*** - you vices, they sound very useful.
Happy motoring

Paul Gayter
18-08-01, 04:00 PM
The collapsible spacer is mild steel and in my case showed signs of the bulge caused during the previous preload operation. I put the spacer on a mandrel and hammered the bulge flat, this caused an elongation of a few thou which was enough for re-use. I quess you could do this a number of times as mild steel is reasonably ductile. I measured the turning torque with a spring balance. Hope this helps.

18-08-01, 05:30 PM
>Nice one
>Tell me, do Real Steel supply the f*** - you vices, they sound very
>Happy motoring

I think I liberated this particular f***-you vice from work sometime, it's a great big lump of cast iron that nearly gave me hernia just lifting it up onto the workbench. Wouldn't be without one!!
An essential tool for the "Butcher of Baghdad" school of cobra building, and one I have pressed (ha ha ) into use on many occasions.


18-08-01, 05:33 PM
Paul - you cheapskate!! Fancy re-using a "use once only" component!! A new one only cost a fiver!


Paul Gayter
19-08-01, 08:16 PM
Hey gimme a break! That's two pints.

20-08-01, 12:43 AM
Sorry Wilf but is your name Wilf Leek? Thought about changing it to
Will it Leek (Sorry couldn`t resist it) he he}>

20-08-01, 10:24 AM
PeteT - I do hope you are going to the track day. Revenge will be sweet!


22-08-01, 11:57 PM
Pete - nice one. Never heard any jokes about my surname before. Also, there's no "will it" - it definitely will!!


29-08-01, 11:29 PM
Alright all - see my post under "transmission" - "tremec Oil" for the final demise of my diff. Anyone with a 3.31:1 non lsd jag diff with no backlash let me know!!