DIFFERENTIAL

[PAUL GOTTS]

Having finally worked up the enthusiasm to drop the propshaft again on my 400se to send it off for a balance check (I've been suffering a mystery vibration for a while now - changed d/s and prop. u/j's, wheel bearings ok etc.), I removed the four bolts from the diff flange only to see about half an eggcup of oil drip out. The large nut seems tight enough, and I don't really want to give it a tweak as I believe it sets the pinion pre-load via a crush washer. Anyone any idea why the oil should have leaked out, by the looks of things along the pinion shaft?

Paul

[TaSmania]

The pinion seal will leak eventually. If the car is used in anger a combination of hard work on the diff gears & LSD and the brakes can warm the diff which'll accelerate the wear. It can be changed in situe (so I'm told but it's a PItheA). Best thing is to drop the diff and get it to Bernie to rebuild. Competition Transmission Services 01582-840008 (Jag 4HU is the general name for the Diff)
GB