Tony
I build lots of TR boxes mainly for racing and I always replace the needle
roller bearing on the lay shaft with a hand made bronze bush with an
internal and external oil scroll. With the needle roller bearings when they
fail (and they will) you will have a catastrophic failure especially in a
racing application. With the bronze bearing you will never have a
catastrophic failure just progressive wear. I get two seasons of racing from
the bronze bushes doing about ten race meetings a year
Regards
Geoff Byrne
TR racer down under
-----Original Message-----
From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
Behalf Of Tony Drews
Sent: Sunday, 17 November 2013 1:46 AM
To: fot@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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