[Fot] 1966 TR4a transmission help

[Bob Kramer Gmail]

All great advice. Another easy approach is to add  vent to the cover on the boss where the TR2 dipstick once lives. These are sold online:




You only get one chance at life, make it a TRIUMPH.

> On Oct 22, 2025, at 9:56 AM, Tony Garmey via Fot <fot at autox.team.net> wrote:
> 
>  The oem vent is a small hole in the tail shaft under the shift tower.
> If your sure that the o rings are leaking - go ahead and pop of the gearbox top and …
> *Add a dash4 fitting for a vent 
> *drill and lock wire the set screws that loc the selector forks to the rails
> * tach weld the centre blade at the end of the rail .
> * change the o rings 
> 
> British frame and engine for the majority of the engine parts. 
> 
> 
> 
> Sent from my iPhone
> 
>>> On Oct 22, 2025, at 7:23 AM, mhmolson--- via Fot <fot at autox.team.net> wrote:
>>> 
>> 
>> Good morning, I have an issue with transmission oil leaking out of the three o ring seals where the transmission selector shafts enter the top cover. This only happens during high rpms. This is an overdrive unit.
>> Has anyone added additional venting to the top cover. I understand there is possibly a small vent hole in the front however I have not looked at this yet. I am also going to build a TR4 motor this winter and am looking for direction and contacts for pistons, liners, and rods. I am good at mechanical logistics, and I have built two strokes, I have also been around engine builders and understand, however this will be my first real build. Yes, I understand that certain things will be left to the pro’s
>> Help appreciated
>> Matt
>> <IMG_2832.jpg>
>> _______________________________________________
>> fot at autox.team.net
>> 
>> http://www.fot-racing.com
>> 
>> Donate: http://www.team.net/donate.html
>> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/vintageclassicsus@outlook.com
>> 
>> 
> _______________________________________________
> fot at autox.team.net
> 
> http://www.fot-racing.com
> 
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/rkramer56@gmail.com
> 
> 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/fot/attachments/20251022/485ef09d/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image.png
Type: image/png
Size: 56723 bytes
Desc: not available
URL: <http://autox.team.net/pipermail/fot/attachments/20251022/485ef09d/attachment.png>