I have both an MGB with an LH OD and a TR250 with an A type OD. Below is
an article on testing the TR250 OD. It may give you some ideas.
http://www.buckeyetriumphs.org/technical/AOD/AOD4/AOD4.htm
This is James Holekamp's email. He sells OD pressure gauges for the
Triumph A and J type Overdrives as well as one for the MGB LH. Maybe he
knows of some procedures for testing the LH. You may want the pressure
gauge.
jholekamp@sbcglobal.net
Don Malling
James Harwood wrote:
> Having aquired a supposedly rebuilt overdrive
> transmission, I thought it would be a good idea to
> test it before installing in the car. Turning the
> input shaft by hand, all for forward gears and reverse
> seem to be working as expected. An electrical test of
> the two switches revealed that the o/d isolator is not
> closing.
>
> My question: is is possible to bench-test the
> operation of the overdrive? Does the box have to be
> turning at some sort of speed before it will operate?
>
> Thanks in advance,
> James
> 74 MGB
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