BTR Differential Pinion Oil Seal

[ukkid35]

How difficult is it to change the oil seal?

Can it be done in situ?

What size seal?

Any special tools needed?

Thanks

Edited by ukkid35 on Tuesday 9th March 14:43

[ukkid35]

This Redneck video has been pretty useful

https://www.youtube.com/watch?v=f-H0KQG5uOI

However the seal used by the diff in the video has a lip enabling it to prized out easily

The BTR Diff has a seal that probably needs to be hooked out

How do you do that without the risk of marking the pinion shaft?

[Hamish400]

I have changed pinion shaft oil seals using the following sequence
Disconnect prop shaft at pinion flange.
I assume the pinion shaft has a collapsible spacer between the flange and the pinion..
EiITHER
Buy a new collapsible spacer and follow a very specific procedure to fit it
OR
re-use the old one as follows. (you must put the pinion back on the shaft without disturbing the compression of the collapsible spacer)

1
Carefully mark nut and shaft to identify the "tight" position for the nut.
2
Carefully Count the number of turns as you remove the nut, until you can just remove the nut. Eg 6 1/8 turns
3
Remove prop shaft flange from splined shaft.
This gives you plenty of room for hooking out the old seal.
4
Carefully press in the new seal without distorting it. Use a suitable size tube or socket or similar to press in the new seal,
5.
refit the prop shaft flange and carefully refit and tighten the nut back the exact number of turns back to its original marked position. I then tighten the nut a further smidgen - about the width of the mark you made ( or say 1 degree. )
CAUTION
You need to be very careful doing this.
If you tighten it too far you will over collapse the spacer and/or affect the pre-load of the pinion etc.
If this happens you then need to renew the collapsible spacer.

CHANGING the collapsible spacer
I do not have to hand the procedure for installing a new collapsible spacer. It may require the diff to be dismantled. If I remember correctly when tightening the pinion nut after fitting a new collapsible spacer, the nut is tightened until the bearing is preloaded to the point a specified torque is needed to turn the pinion shaft.

Best regards
Hamish

[Hamish400]

I should add that I do not know if the BTR diff ihas a collapsible spacer arrangement for the pinion. Someone else may be able to advise this.

[TwinKam]

Very important addendum if you do the above:
The flange must be refitted in exactly the same orientation to the shaft as it was removed, so mark it up before removing.

[Zener]

TwinKam said:

Very important addendum if you do the above:
The flange must be refitted in exactly the same orientation to the shaft as it was removed, so mark it up before removing.

This ^ and can confirm indexing the nut correctly tightening to line/mark plus a further 5/10 degrees on tightening to confirm assy is pulled together without altering bearing pre-load and crownwheel to pinion mesh due to having said collapsible spacer

[ukkid35]

Thanks everyone - very helpful indeed

Does anyone know the size of the seal?

[Tyre Tread]

Just went to order the seal from TVR Power. The £20 for a seal sin't cheap but another £9.50 postage! A bit much for a seal.

Any other options for acquiring the seal?

[ukkid35]

Sorry, don't know the size as I ended up getting the diff rebuilt

Made a huge difference with traction out of corners once the Hydratrak was working properly

However, I have had luck with some suppliers by ringing and asking if they can post small items for a more realistic fee

[Tyre Tread]

TVR Power don't have a website you can but from. You add to your wish list and they call you.

They called me this morning to fulfill my request to send the seal and it was then they told me postage was £9.50 at which time I declined saying I may need more items so I'll wait until I've put a list together. Had it been a couple of quid I'd have said post it but an overpriced seal increased by 50% with postage!

[sixor8]

Racetech have it in stock. They have a high default postage charge, but IME if it is small and light, they refund you some of the fee. They want £18.99 + VAT !

https://www.racetechdirect.co.uk/search/?Q=pinion+...