[Fot] A-Type O/D Testing & TR4 vs 4A-TR6 Release Bearing Sleeve Thickness

[Tony Drews]

I think that most of us who race the bit TR-s have gone to the 
diaphragm clutch like on a TR4a.  The ones with fingers have been 
known to come apart at high RPM and are a good test of the tensile 
strength of the scatter shield or of your feet.  That's not a part I 
care to test.

Tony Drews

At 05:21 PM 7/2/2014, Glenn Franco wrote:
>Thanks all for the input on A-Type (Box O Parts) Overdrive testing 
>and Release bearing sleeve.
>Trans and O/D work fine (leaks a little-bad Moss part) Swapped out 
>the release bearing sleeve for the bronze one from the TR4.
>Everything works OK at this point.
>I can confirm that the TR4 has a shorter bronze sleeve than the TR6 
>and the TR4 uses a Borg & Beck coil spring 3 finger Clutch Cover or 
>pressure plate.
>Glenn
>
>>>Group
>>>I'm trying to bench test an A type that I overhauled this past 
>>>winter from a box of parts.
>>>I also have an A type that I took out of a 71 TR6 that I would 
>>>like to test before using them in any cars.
>>>
>>>1st dumb question
>>>What do you think the minimum input shaft speed needs to be to 
>>>allow the O/D to engage.
>>>
>>>I fabricated an adapter from a clutch hub and various pieces of 
>>>steel on a lathe to drive the trans from the input shaft.
>>>
>>>I'm spinning the adapter with a large 1/2 inch drill but the max 
>>>drill speed is only a little over 500 RPM which is probably not enough.
>>>
>>>I get oil flow up the operating valve when the plug is removed but 
>>>no engagement. This is the result of spinning both transmissions.
>>>
>>>Any suggestions/more RPM's
>>>Thanks Glenn
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