First thing I'd check, is the oil leaking at the seal or the gasket pack behind the flange the seal mounts into, that gasket pack was available from Adrian Dawes a while back, so hopefully he still supplies these sort of bits.Newcastle George wrote: ↑Thu Jul 14, 2022 11:13 am And a good morning call from me. Not so good here as the diff in the Bedford is leaking worse than ever. When I brought the bus up the drive and crawled under to check it out there was a heap of oil hanging off the diff, luckily I had a drip tray handy. I wiped all the oil away and then drove the bus back and forth, 5 metres, a number of times and fresh oil appeared. I will be calling on the mechanic and asking that they come to my premises to check it out.
George
If it is the seal leaking, double check the pre-load on the pinion bearings, if that is insufficient the pinion will move in a near orbital motion and the seal will not be able to compensate. the next is the level of wear on the pinion flange where the seal runs.
If it's actually leaking around the nut that holds the driveshaft flange onto the pinion, the splines are so badly worn the nut will not stay tight and there is no way to stop the oil leak without replacing at least the flange, just hope the pinion isn't worn in the splines as well .... then it's a full rebuild, new crown wheel and pinion stuff and that's when you find the planetary gears have chewed away the casing and ....
T1 Terry