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

[Van Mulders Marcel]

"...the problem is holding the hub..." : I think Geoff is right. Years ago,
I've asked a couple of machine shops to modify the layshaft : they didn't
like the idea, because, when the 2 needle roller bearings are not perfectly
in line, the modification makes things worse. Many layshaft bearings are
destroyed by lack of maintenance. The modified layshafts get new oil!
Perhaps one good quality caged bearing is strong enough?
When modifying, I would ask to fit a sleeve, like Steve Yott is doing.
Sure there are machinists who can do this conversion perfectly, even without
fitting a sleeve,but how can we know?
Marcel
-----Oorspronkelijk bericht-----
Van: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] Namens
Geoff Byrne
Verzonden: zondag 17 november 2013 8:28
Aan: 'Jerry Van Vlack'; 'Stutzmans'; 'Joe Alexander'; 'TonyDrews'
CC: fot at autox.team.net
Onderwerp: Re: [Fot] TR-4 / TR-6 tranny layshaft bearing mod?

I've also looked into this and the problem is holding the hub to accurately
grind it Geoff Byrne

-----Original Message-----
From: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] On
Behalf Of Jerry Van Vlack
Sent: Sunday, 17 November 2013 1:08 PM
To: Stutzmans; Joe Alexander; Tony Drews
Cc: fot at autox.team.net
Subject: Re: [Fot] TR-4 / TR-6 tranny layshaft bearing mod?

I think Bruce meant the hardness of the material was too hard to machine, a
good grinding house could manage it. Or someone with the proper tooling.
JVV

-----Original Message-----
From: Stutzmans
Sent: Saturday, November 16, 2013 8:39 PM
To: Joe Alexander ; Tony Drews
Cc: fot at autox.team.net
Subject: Re: [Fot] TR-4 / TR-6 tranny layshaft bearing mod?

At my request, my machine shop guy tried to find somebody who could modify
it to take extra bearings.  Everybody said it was too hard.
Bruce
----- Original Message -----
From: "Joe Alexander" <n197tr4 at cs.com>
To: "Tony Drews" <tony at tonydrews.com>
Cc: <fot at autox.team.net>
Sent: Saturday, November 16, 2013 9:54 AM
Subject: Re: [Fot] TR-4 / TR-6 tranny layshaft bearing mod?


> Ed W.  (FOG1) can be very helpful.
>
> Sent from my iPad
>
>> On Nov 16, 2013, at 8:46 AM, Tony Drews <tony at tonydrews.com> wrote:
>>
>> 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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