[TR] early TR4

[Michael Marr]

I admit, it’s been a long time since I changed a pinion seal on my 3A, but I’m pretty sure the the pinion position relative to the crown wheel, and it’s preload, are determined by shims behind the pinion head bearing, and another set of shims between the tail bearing and the bearing spacer. Thus, as long as the tail bearing is not disturbed, you would not need to mark the position of the castle but, but simply retorque it to the required 85-100 ft lbs. I must add that I am referring to the 3A’s diff here, but I’m pretty sure the solid axle 4 has the same arrangement.

Mike

Sent from my iPhone

On Jul 13, 2021, at 11:55, Cliff Hansen <cliff_hansen at outlook.com> wrote:


Dave,

The only other place I can think of to leak is the pinion seal at the front. There’s a chance that the old seal has worn a groove in the pinion flange, which can be remedied by a Speedi-sleeve.

When I removed the seal from my 4A IRS’s diff, the seal material was leather and it was leaking terribly.

If you are going to change the seal yourself, I would mark the position of the castle nut relative to the pinion input shaft, and reinstall to the same position. The nut sets the preload for the pinion bearings, and assuming your car uses the solid spacer removing and replacing that nut to the same position shouldn’t change the preload.  That’s the best I understand it.

Cliff


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From: dave<mailto:dave at ranteer.com>
Sent: Tuesday, July 13, 2021 10:12 AM
To: triumphs at autox.team.net<mailto:triumphs at autox.team.net>
Subject: [TR] early TR4

Approx. 9600 serial number; its essentially a TR3.

The rear end leaks profusely.  I understand there is/are seal(s) that need to be replaced; its not the diff cover gasket.  BTDT

Is there a link somewhere to the process and parts needed?

Recommendations on upgrade(s)?

Thanks!

** triumphs at autox.team.net **

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