XJR Rear Whine and Clunk
Discussion
I seem to have developed a whine that increases with speed and also a clunk when I go around left hand corners!
Thought it might be wheel bearings but I checked for play and 3 are rock solid, but the front near side was nearly hanging off! So new hub for that, but can anyone hazard a guess as to whether my diff is about to die?
It's very wet, oil all over exhaust baffles and a whine that increases with speed (from rear)
It's a 1998 V8 XJR
Many thanks
P.S. Is the XJR diff the same as the XJ8 diff?
Thought it might be wheel bearings but I checked for play and 3 are rock solid, but the front near side was nearly hanging off! So new hub for that, but can anyone hazard a guess as to whether my diff is about to die?
It's very wet, oil all over exhaust baffles and a whine that increases with speed (from rear)
It's a 1998 V8 XJR
Many thanks
P.S. Is the XJR diff the same as the XJ8 diff?
Edited by schueymcfee on Sunday 4th May 15:44
schueymcfee said:
I seem to have developed a whine that increases with speed and also a clunk when I go around left hand corners!
Thought it might be wheel bearings but I checked for play and 3 are rock solid, but the front near side was nearly hanging off! So new hub for that, but can anyone hazard a guess as to whether my diff is about to die?
It's very wet, oil all over exhaust baffles and a whine that increases with speed (from rear)
It's a 1998 V8 XJR
Many thanks
P.S. Is the XJR diff the same as the XJ8 diff?
If the diff is wet and is whining then it is probably shot - low lubricant levels probably causing wear in the bearings and then the gear teeth. Once the teeth are worn they will never be quiet.Thought it might be wheel bearings but I checked for play and 3 are rock solid, but the front near side was nearly hanging off! So new hub for that, but can anyone hazard a guess as to whether my diff is about to die?
It's very wet, oil all over exhaust baffles and a whine that increases with speed (from rear)
It's a 1998 V8 XJR
Many thanks
P.S. Is the XJR diff the same as the XJ8 diff?
Edited by schueymcfee on Sunday 4th May 15:44
The good news is that the XJR shares a diff with the XJ8 4.0 so a good secondhand unit should be relatively inexpensive.
If you do go for secondhand, try to buy on a sale or return basis, with a warranty.
Jaguar specified that the diffs fitted to the X308 were a sealed for life item. The oil level should have been checked every service, but this check is often ignored on cars with the rear anti roll bar fitted as this makes access to the filler plug difficult.
This means that it's pretty likley any replacement secondhand diff you fit will never have had an oil change. It may have also been running low on oil for years. The factory fill oil was a very ordinary EP 90 - hardly the best oil to ensure a long life in the first place - so unless you can hear it running, see it's not leaking, be absolutely sure it's a lowish mileage one, and can take it back if you're not happy I'd suggest you get some prices for a reconditioned one instead - especially as you're going to be shoving 390BHP
through it
Jaguar specified that the diffs fitted to the X308 were a sealed for life item. The oil level should have been checked every service, but this check is often ignored on cars with the rear anti roll bar fitted as this makes access to the filler plug difficult.
This means that it's pretty likley any replacement secondhand diff you fit will never have had an oil change. It may have also been running low on oil for years. The factory fill oil was a very ordinary EP 90 - hardly the best oil to ensure a long life in the first place - so unless you can hear it running, see it's not leaking, be absolutely sure it's a lowish mileage one, and can take it back if you're not happy I'd suggest you get some prices for a reconditioned one instead - especially as you're going to be shoving 390BHP
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