[Fot] TR4/6 Transmission, Catastrophic failure

[John Hasty]

10-4 on better syncros...

Sent from my iPhone

> On Nov 4, 2014, at 4:23 PM, "Jeff Durant" <jeff_durant at comcast.net> wrote:
>
> Scott,
> Was the MS 2nd gear steel bush the stock "top hat" version or the 2 piece
> version (bush and thrust washer)? I ask because I've found the steel
bushing
> and thrust washer offered as an upgrade for the earlier MS 2nd gear have
some
> running clearance issues.  Specifically, the OD of the bush is very tight
when
> fitted to MS 2nd gear in some cases.
> I just built a CR TR box using the 2 piece steel bush/washer arrangement
from
> Rimmer Bros. and had to polish both the OD of the bush and ID of 2nd gear
to
> gain an acceptable level of clearance for adequate lubrication.  The bush
ID
> to mainshaft was good after minor deburring and polish. Had I not done so,
I'm
> certain it would have seized resulting in a failure similar to what you
have
> experienced.
> As a general rule, I spend lots of time deburring and polishing the
mainshaft,
> bushes and all gears before final clean and assembly.  So far, no
catastrophic
> trans failures!  Now if I just had better syncros.
>
> Regards,
> Jeff Durant
> TR4a/250/6 and #12 TR6
>
> Sent from my iPhone
>
>> On Nov 4, 2014, at 10:28 AM, Scott Janzen <sjanzen at me.com> wrote:
>>
>> I had a freshly rebuilt transmission with mostly new parts, including a
new
>> close ratio gear set, fail spectacularly after only a few laps of use.
> Second
>> gear "welded" itself onto the mainshaft, with the result that the gearbox
> was
>> effectively in two gears at the same time (car was under power in third
> gear)
>> and all of the teeth were stripped off of the 2nd gear set.
>>
>> The gearbox was filled with fresh Redline MTL (75-90)  - it was still
> filled
>> well above the side fill plug when I took the top off the box.  What could
>> cause this failure - chalk it up to a defective bushing?  The bushing was
>> steel (?), not the bronze variety.
>> _______________________________________________
>> fot at autox.team.net
>>
>> http://www.fot-racing.com
>>
>> Donate: http://www.team.net/donate.html
>> Archive: http://www.team.net/archive
>> Forums: http://www.team.net/forums
>> Unsubscribe/Manage:
> http://autox.team.net/mailman/options/fot/jeff_durant@comcast.net
> _______________________________________________
> fot at autox.team.net
>
> http://www.fot-racing.com
>
> Donate: http://www.team.net/donate.html
> Archive: http://www.team.net/archive
> Forums: http://www.team.net/forums
> Unsubscribe/Manage:
http://autox.team.net/mailman/options/fot/jhasty@mhc-law.com