P38A Leaky rear diff

300bhp/ton · Sep 21, 2019

Almost got my p38 MoT ready. Test driving it around the field today and it seems to have developed a leak.

Quite a lot of oil (think it’s oil) is dripping down from near the rear Y section of exhaust not far from the fuel tank, above the rear axle.

The nose of the diff and end of be prop are all wet. So I’m guessing it’s the pinion seal.

Google is being a little vague and I can’t find a p38 exploded diff diagram. Is there only one seal for the pinion?

Such as this
https://www.ebay.co.uk/itm/Bearmach...179524&hash=item33bca33988:g:ys8AAOSwyLlXoXdO

Thanks.

marjon · Sep 21, 2019

edit

rear diff

read the post properly (slap myself)
Needs a closer look

J

RangeRoller dt · Sep 21, 2019

There’s fuel lines, filler neck, brake pipes over the tank on some models near there can go, but photo looks like diff spitting

Have you checked the level?

300bhp/ton · Sep 21, 2019

Nah it had got too late. I only crawled under to check some bolts. Thought it was brake fluid at first as I’d just had a low fluid warning on the dash. But it doesn’t smell or feel like brake fluid. Nor petrol.

It’s a golden colour. EP90 I think. But first saw it dripping down off of the cross member by the exhaust and onto the top of the diff casing and then dripping off the bottom of the diff. Think it must have flown the oil everywhere. Hoping it’s only the diff pinion and nothing more serious at any rate!

RangeRoller dt · Sep 21, 2019

I’ve failed to kill my diff, yours should be two pin so can take a hammering. Probably just seal but check your shafts aren’t wobbling while your under there

Grrrrrr · Sep 21, 2019

300bhp/ton said:
Almost got my p38 MoT ready. Test driving it around the field today and it seems to have developed a leak.

Quite a lot of oil (think it’s oil) is dripping down from near the rear Y section of exhaust not far from the fuel tank, above the rear axle.

The nose of the diff and end of be prop are all wet. So I’m guessing it’s the pinion seal.

Google is being a little vague and I can’t find a p38 exploded diff diagram. Is there only one seal for the pinion?

Such as this
https://www.ebay.co.uk/itm/Bearmach...179524&hash=item33bca33988:g:ys8AAOSwyLlXoXdO

Thanks.

View attachment 190176

View attachment 190177 View attachment 190177

@jamesmartin would know.

Henry_b · Sep 21, 2019

It has a seal, as do all diffs thats how u keep the juicy bits in.

Whats the fluid level like?

Brake fluid level?!

brianp38dse · Sep 21, 2019

I would be checking brake lines above tank.

dubbleRR · Sep 22, 2019

Have a look at the breather pipes ,as a blocked one might cause pressure n oil leak........

Mark Piercy · Sep 22, 2019

As rest says, check the flange on the he diff nose has no play in it

Rest?? RRDT...

Datatek · Sep 22, 2019

I'd bet on it actually being a brake line.

Mark Piercy · Sep 22, 2019

Datatek said:
I'd bet on it actually being a brake line.

If you spray the liquid with water it'll go milky and clean away. If not it's oil.

P38A Leaky rear diff

300bhp/ton

Well-Known Member

marjon

Well-Known Member

RangeRoller dt

Well-Sprung Member

300bhp/ton

Well-Known Member

RangeRoller dt

Well-Sprung Member

Grrrrrr

Technician, Bodgit & Scarper Ltd

Henry_b

Think outside, no box required.

brianp38dse

Well-Known Member

dubbleRR

Well-Known Member

Mark Piercy

Well fumbled member....

Datatek

Well-Known Member

Mark Piercy

Well fumbled member....

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