[Fot] Question

[Jack Wheeler]

 Thanks Tom.  I have the original transmissions from my TR-2 and TR-3 sitting in my garage.  I just measured the thickness of the flange and it is .360" on both.  I don't know what that converts to in millimeters.  I assume the early TR-4 was about the same, although the gearbox housing casting was different due to going to the fully synchronized transmission on the TR-4 (and some TR-3B's)
As to my original question, I dug out my factory parts books for TR-2 - TR-6 to check the part numbers for the slave cylinder support bracket.  Unfortunately, my TR-2 parts book is for TR-2 through TR-3A, and while it shows 2 different part numbers, it doesn't tell when the change was made.  So, I think the TR-2 and some of the TR-3's used bracket part number 106701.  At some point during the TR-3 run, they changed to part number 128042.  Interesting enough that same part number appears in both the TR-4 and the TR-4A parts books.  Therefore, once they changed to 128042, they stayed with it for all the rest of the TR-4's and TR-4A's.
The tr-6 bracket is completely different (it doesn't curve around the bell housing) and it is part number 136353.
So, that's all I know.  If anyone knows when, during the TR-3 run they switched to the 128042 part number, I would like to know.  Also, if you have a bracket which you know is for a TR-4 or 4A, please check the measurement between the top holes, as explained in my original email below, and let me know the distance between them.Thanks.
Jack

    On Saturday, January 23, 2021, 1:20:43 PM EST, trhouse at columbus.rr.com <trhouse at columbus.rr.com> wrote:  
 
 I think you are correct about the TR4 or TR6 the flange on the TR6 bell housing is thicker.  I'll check a TR2 / Doretti here in the garage but will be a while till I get to the storage area to check anything else 
New Facebook with confirming early history 
https://www.facebook.com/dorhouse1/


-----------------------------------------
From: "Jack Wheeler via Fot" 
To: "FOT Triumph"
Cc: 
Sent: Saturday January 23 2021 1:07:23PM
Subject: [Fot] Question

I have a question about thebracket that the clutch slave cylinder attaches to.  Thisbracket is attached to the bottom of the bell housing and issupported by a 5/16" rod that goes from the bottom of this bracketand attaches to one of the oil pan bolts.  Got that sofar?
I have 2 of these brackets andthey are different.  It looks like the difference is in thehole location and shape.  One bracket would appear to locatethe slave cylinder closer to the bell housing than the other. I assume one of these is for a TR-3, and the other for a TR-4,although who knows when they made the change.  My question iswhich is which?
It looks to me like the best wayto differentiate is the difference in the upper hole location, thatis, the 2 holes at the top of the bracket when installed.  Oneof my brackets has the top holes approximately 1 5/8" apart oncenter.  The other bracket has the top holes 1 13/16" apart oncenter.
So does anyone have a bracketwhich is known to be for a TR-3 or one known to be for aTR-4.  If so, could you please measure the distance betweenthe top holes on center?  Thanks for your help, and if anyonehas any information about when this was changed (and why), I wouldbe interested in that.
Jack Wheeler
  
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