Worryingly there seems to be more and more cases of diff and e diff failures on the f's.
There have been oil leaks documented on quite a few, but worryingly it appears that cars are losing their diffs, evident by strange noises from the rear, at anywhere from 25 ~50k miles.

I'm in the process of collating info (as I did quite a few years ago regarding underbody brace corrosion that got accepted by Jag UK as a build issue) and need help from guys over your side of the pond and beyond.

I'm yet to find any explanations from dealers regarding why the diffs fail, after all they just swap out the whole unit as opposed to diagnose and fix them, but I'd put money o it being oil contamination, and early break down of the lubricating properties perhaps?

So anyone that's had issues, I'd be glad to hear from you, as I would any diagnosis of why failure occurred.
Be good to know which diff/car model and mileage covered too.

TIA

 

My 2016 F-type S manual transmission suffered differential failure and it was replaced under warranty in 2018. As to cause - my guess that rapid uptake of 2nd generation clutch and lack of damping (i.e. no flex disk) exceeded tolerances and sent it packing.

 

Been there, done that. Replaced under warranty several years back. 2015 V6S and my guess is it was somewhere in the 2-3 year range and around 20,000 or so miles.

 

Mine had a pinion shaft seal leak at 32K miles. I'm at 42K now.

It's too bad we don't have information from disassembly of failed units. I'm not sure the symptoms of failures so can only make broad speculations. Some possibilities, based on experience rebuilding many transaxles:

Improper tolerances leading to premature wear
Improper bearing load, leading to premature wear
Materials failure (manufacturing fault)
Incorrect oil

I'll be watching this thread for more information. I'm not worried, but if it's something I should be keeping an eye on, than I'll do so. I'm also interested in how issues split between different configurations (6/6S/8S/R)

 

Sub'd

Sounds like no matter what, Jaguar will replace them under warranty. I hope they are actually diagnosing the issues in some secret lab and coming up with a solution.

 

For a great deal of owners, warranty is well past.

My aim is to find thd root cause and either:

a) work out preventative maintenance schedule to ensure they don't fail and/or

b) publicise with magazines etc and ultimately JLRUK to bullitenise the issue/cure etc as was done with the Underbody Corrosion Issues.

Please keep the info coming. Collectively this can be addressed.

 

Hi Frank here, my16 s coupe, storm gray brogue interior ivory stitching performance seats. I just had my pinion gear seal replaced, 33,700 miles, under warranty.
My car is due for annual service and oil change, in May. I will request that while car is on lift I can inspect underside of car.
Frank Hudson valley NY

 

So far, we have 5 pinion diff seals posted on the UK forums...

https://www.ftypeforums.co.uk/viewtopic.php?t=4292

AWD owners have 2 x diffs plus the transfer box to deal with... Guess we will see similar issues once age and mileage creeps up?

Hopefully get more feedback as time goes on...

FWIW I intend to put Fresh BOT720 in soon (around 16k miles) before it gets too contaminated.Oil will be off for analysis for a giggle.
Keeping it clean internally is going to be the savior... So long as your seals aren't weeping of course!

 

2015 S
+1 pinion seal replaced….didn't take, so
+1 diff replaced.

 

My diff failed. 2015 R, I think it was due to overheating. Not sure, I still have the diff here and haven't opened it. When I drained the original oil there was only like a 1/2 quart in there, no leaks.

 

My 16 R is at the dealer and they think the diff has failed at 11k, they’re saying lowering the car could void the warranty for it and stock springs need to go back on, such BS. so I have that topic to battle my dealership with...

 

I can’t see how anyone could argue that a lowered suspension affects the differential.

 

+1 diff replaced in 2018 on my MY 2016 V6S (on the road since March 2015). No problems since but keeping a close watch on it.

 

11K?! Damn mine barely ticked 12k. Now I'm a little nervous. What symptom did you have before the diff potentially failed?

 

2016 V6S M/T had a pinion shaft seal leak @ 21K - replaced under warranty.

 

I checked the passport to service book in my owners packet. no where can I find any info on diff fluid change as part of car maintenance?
owners manual also does not list what type of fluid? I find this strange.
anybody have that information?

 

It's not in the Owner Manual or the Service Schedule as it's yet another of those JLR "for life" things, like the auto trans fluid and the SC oil.
For the life of the warranty that is!
Anyway I know I have posted the diff fluid specs around here somewhere but for the life of me I can't find it anymore even though I am sure it's in the Workshop Manual.
But from memory I know the diff fluid for both the mechanical LSD on the S and the e-diff on the V8/R is Castrol BOT 720, and it is something else on the "base" non-LSD diff.
And again from memory the wet fill amounts are .8 litres on the S and 1.2 litres on the V8/R.

 

https://www.jaguarforums.com/forum/f...ge-diy-230515/

https://www.jaguarforums.com/forum/j...ntials-134733/

 

Hi, I know this is slightly off topic but time/age of oil vs miles. I have a 2017 AWD S with only 5000Km on the clock. (3001 miles) however I am pretty sure it is the same diff oil that was put in when it came off the assembly line in Feb 2017 in Coventry. So it is now 3yrs and 4 months old. I have googled this and everyone just talks about mileage as to when you change the diff oil. However is this oil now degrading and should I change it? Thanks!

 

Diff oil will not degrade as fast as engine oil, and there are NO combustion by-products to affect it. I plan to replace ours at about the 30,000 mile mark.

Same with ATF.