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Olbod,the P38 diff is set up with backlash from the factory for some reason that no one can explain so the CW&P teeth don't mesh correctly.Think of your fingers meshed together,one hand is the CW,the other hand is the pinion,the more they slide together the stronger the contact. Pat
Hi olbod, the issue is with the P38 style diff fitted to the rear of the 110's and 130's. If I remember correctly from what Dave Ashcroft explained in another thread the biggest problem is the short distance between the pinion bearings. This allows the pinion gear to move out of alignment with the crownwheel under load. (No doubt if this isn't correct or complete someone will add to this).
As for failing, I personally haven't heard of diffs getting to a point where the car is undriveable. The early symptoms of a problem appears to be a leaking pinion seal and/or a whine/dry running sound.
In saying that I have done 60,000kms without an issue with either diff in my 110.
Cheers,
Thanks.
So, If a diff lock was fitted by a real Landrover mechanic, would that be sufficient to fix the problem and would or could the backlash be reset at the same time ?
LandRover spares here in Mackay do a good job of fitting ARB air lockers
into Landies. I would trust them before the local ARB installers !!!
I would prefer an Ashcroft locker, but ?
Ta.
Robert.
Changing the diff center won't help I'm afraid as the problem lies with the diff casing design. :(
I'm personally hoping Ashcroft make a drop in replacement diff.
Cheers,
P38 type dif,f not Puma.......palm to face.
IMO the design is a problem, but the factory set up is a major contributor. As I have stated in other threads, the only reason I can see multipule warranty claims from indivdual owners, is the LR dealer mechanics are grabbing complete 3rds off the shelf, already set up by LR UK and just bolting them in. Hence the problem can reoccur.
It is not just the close pinion bearings, but the thin crown wheel that allows deflection. I would like to see pictures of the OEM carrier and a good Ashcroft carrier before I said that no difference would be made to deflection. If the crown wheel is better supported that must help.....maybe it doesnt.
I believe there is enough meat in the 3rd member casting to allow for bigger bearings on both carrier and pinon....
I doubt bigger pinion bearings would help, it's the distance between them thats the problem. This is why a few of us would be happy if Ashcrofts developed a new complete center with a longer "nose" that would accept an off the shelf sals length prop, (with a locker option of course :) ).Quote:
Originally Posted by uninformed
Cheers,
Check out "life of puma rear diff's" thread.
Pictures of the Ashcroft casting and complete drop in diff centre.
And lots of info.