Differential turnjng torque

[alunwill]

Does anyone have a typical value of the total turning torque for a refurbished diff. By this I mean the inch pound value of the input shaft when the diff is fully assembled on the bench

A

[abowie]

Not off the top of my head but pretty sure you’ll find it in the manual. I’ll have a look when I get home from work.

[mgcjag]

Typically you would measure seperatly the pinion and out shafts as you assemble the diff....you then have a cumulative effect of all and the new seals....all I could say is it will be tight to turn by hand.....Steve

[44DHR]

As Steve states, you would measure the turning torques separately as the diff is assembled. These photos below are the pinion torque settings from a later Jaguar publication - I think the XJS if I recall as I don’t think these torque figures are given in the Jaguar E type Service Manuals. It is for a later differential using the double taper rolling bearings. Initially the pinion torque figure is taken and recorded, to then be added to the torque figure obtained once the backlash has been set, but interestingly before the output shaft assemblies are finally torqued up.






Hopefully of use.
Cheers,
Dave

[Iansparky]

I recently had my diff refurbished by Alan Slawson, I could not move the input shaft by hand and had to use 2 bolts and a screwdriver to turn it

[44DHR]

Iansparky, if you know your torques, the range given in my information above for differentials with new bearings, could total between 40 to 50 lbs/in, which as Steve states at post #3, would be very tight to turn by hand.
My local “metal refurbishing” company - used to be my local scrapyard - knows what parts I’m always interested in and one time called to say they had a Jaguar XJS come in. I removed the rear suspension cage and took the differential out. The rear suspension cage looked to be in considerably better condition than the rest of the car which was being scrapped. I was surprised how hard the input flange was to turn - as Steve states - I needed a lever to get it moving, but noted the following two stickers on the cage and differential which I hadn’t seen before.



On opening the rear cover the differential was absolutely like brand new, so I’ve assumed the black cross on the red background which was stuck on the differential cover indicated it was part of a Jaguar replacement exchange rear suspension assembly containing a new differential unit. Unless anyone else knows any different ?
Cheers,
Dave