[Fot] Diaphram Pressure Plate

[John H. Hasty]

Thus Spake Zarathustra!

From: Fot <fot-bounces at autox.team.net> On Behalf Of Jack Wheeler via Fot
Sent: Monday, January 30, 2023 3:07 PM
To: Dave Riddle <Dave at microworks.net>
Cc: FOT Triumph <fot at autox.team.net>
Subject: Re: [Fot] Diaphram Pressure Plate

The TR-4A clutch and pressure plate (diaphragm style) will work, but you have to redrill the flywheel for the TR-4A bolts and dowel pins (get a well qualified machine shop to do this).  If you have the early TR-3 (I think up to VIN 50,000) it used a different style starter motor.  The early cars had a long starter which engages the flywheel from the front.  After 50,000 they switched to a shorter started which engages from the rear of the flywheel.  All later TR-3's, TR-4's and TR-4A's used this same starter.  So, if you switch flywheels, make sure you have the right starter.  The bell housing also changed at TR-3 50,000 to accommodate the later starter.

If your TR-3 is after VIN number 50,000 you can bolt on a TR-4A flywheel, which will accommodate the TR-4A diaphragm style clutch, with no further changes.  Good luck.

Jack Wheeler

On Sunday, January 29, 2023 at 08:05:07 PM EST, Dave Riddle via Fot <fot at autox.team.net<mailto:fot at autox.team.net>> wrote:



Instead of the Borg style does anyone make a Diaphragm style for the TR3?  I’m using an OD gearbox.



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