Jag IRS Differential cases and stub axle seals

joyridin' · #1 (**permalink**) 03-13-2018, 06:39 AM

Yes, they are all the same from that aspect. If you are going through all this work, I would buy new clutch disks. Yukon makes them for $80 and you can get them off Amazon. Do not buy the heavy duty version though. Just get the standard or your car will be jumping around corners. Do not ask how I know! LOL

BTW...all the bearings are available at any industrial bearing distributor as well as auto parts stores. I got all Timken from a local place that sells to industrial customers for about 30% less than the auto parts stores...and they were all Timken brand.

Buzz · #2 (**permalink**) 03-13-2018, 07:30 AM

That's good news. I just pulled the stub axles out of the old 3:54 case and lo and behold - tapered roller bearings! Everything looks in beautiful condition - even the o-rings look good, but it was definitely leaking.

By contrast, the internals of the newer 3:31 diff were dirty with a muddy, gritty sludge in the bottom. I definitely feel safer with the older diff so either I swap the internals into the newer case and button it up with all of the new brakes, etc. that I had ordered; or I just order a new set of seals, calipers and brake discs for the series 1. That's the easier option, but the relative weight of the brake components almost triples the price by the time I pay all of the duties and taxes. Return shipping cost is ridiculous, so exchange is not an option. Not a back breaking expense, but the wastage really bugs me.

Tom Wells · #3 (**permalink**) 03-13-2018, 08:15 AM

Buzz,

Mike Bontoft is still the guru for the Jag IRS. He moved to England some years ago and can be found here: Contact /

He may still be willing to answer a tech question or two. Might be worth a try.

Tom

SSSammy · #4 (**permalink**) 03-13-2018, 09:09 AM

Buzz, I've read the above and I'm not sure you understand about the shaft seals that are pressed into the cover. Joyridin' #14 post above refers. These seals ride on the stub axle rotating shaft and can harden with age and leak. They are particularly vulnerable to heat from the inboard brakes under heavy track use. See:

www.englishparts.com/products/gb/Jaguar/XJ6/OUTPUT-SHAFT-SEAL--Stub-Axle/19431/RTC1216.html

I recall having to buy a couple versions to get the correct ones for my ERA diff. To replace them on a one piece axle/output flange unit, you must disassemble the stub axle (yes, major PITA). To re-assemble that cartridge unit you have to torque the inner nut to pre-load the bearing correctly. I carried them to my mechanic ...

Sam