I think Peter is talking about the open cage style counter shaft
bearings (see Step 12 of
http://www.vtr.org/maintain/TransRebuild/TRTrans01.pdf). My experience
is that the open style is worse than the closed shell bearings. For
racing, two bearings or a longer bearing would be better than either one
of these. For a street car, I usually recommend the shell type even
though they are a PITA to get out.
- Larry
On 11/19/2013 12:09 PM, Tony Drews wrote:
> The Open bearing you describe - is that the bearing between the input
> shaft and the main shaft?
>
> Thanks, Tony
>
> At 06:20 AM 11/17/2013, Peter Vucinic wrote:
>> 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
>> _______________________________________________
>> fot@autox.team.net
>>
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>>
>>
>>
>> -----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
>> _______________________________________________
>> fot@autox.team.net
>>
>> http://www.fot-racing.com
>>
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