[Fot] TR-4 / TR-6 tranny layshaft bearing mod?

[Peter Vucinic]

Tony,
You can purchase a modified Countershaft Gear Set form Rimmer Brothers. Moss
probably have them as well?
It is already machined to accept 2 bearings at one end. All the hard work
has been done.

Also, if your gearbox has the needle roller bearings that are captive in a
steel outer. Get rid of this design and use the TR6 style of 'open' bearing.

The early style of bearing with the steel outer will allow wear material and
debris in the oil to locate inside this design bearing and cause premature
failure. Not a good design. 

All the gear boxes I build I change to the later open style bearing and
haven't had an issue as long as you regularly change the transmission fluid
etc. Especially true if you have an Overdrive attached where you are now
introducing wear material from the lining in the OD.

I just freshened up a friend racing gearbox after 10 years of competition
running with a J type OD attached. Lay shaft only had a few thousands of an
inch wear.

Hope that helps?

Cheers...


"You can Make a Small Fortune From Motor Racing. As long as You Started With
A Lage Fortune!"
Kind Regards
Peter Vucinic
TR-4
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-----Original Message-----
From: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] On
Behalf Of Tony Drews
Sent: Sunday, 17 November 2013 1:46 AM
To: fot at autox.team.net
Subject: [Fot] TR-4 / TR-6 tranny layshaft bearing mod?

Has anyone modified the TR-4 / TR-6 tranny layshaft assembly to accept
larger, higher capacity bearings?  Turns out the root cause of my
transmission failure was the failure of the front needle bearing in the
layshaft assembly.  Before I do the parts search / purchases, I thought I'd
check to see if there's a longevity improvement that can be made there.

It's been a while since the box was apart, and let me tell you - with a
buggered up layshaft shaft the disassembly is challenging.

I'll be replacing, input shaft, layshaft and 3rd gear at least.  Also had a
weird failure where one of the pins that the spring slides onto in the
overdrive is broken off - may have been an assembly issue.

I may have most of the parts needed for the rebuild, we'll see what uncle
jack's tranny parts stash includes.

Cheers, Tony Drews
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