List,
After 40 years and countless 'A' type overdrives, I recently had two that were
not releasing from overdrive. I spent a couple of hours with the owner of one
of them and his TR4 this a.m. and determined that the o/d clutch was sticking.
A light tap with a hammer would release it each and every time it hung up. The
fluid in the unit was 30 wt, non-detergent from a local FLAPS. Having read of
a similar experience on the Healey list, and not wanting to give up my lead
hammer, I suggested that we try Redline MT90 as the Healey owner had done to
solve the problem. Here's the TR4 owner's subsequent email:
"I went straight to Foreign auto and picked up 4 containers of it. Drained and
refilled with the MT-90. I just got back from the test drive before the
downpour with GREAT results! No more issue with the OD. I'll bring the 2
containers to you ($11 each!) and the socket. I'll return tommorrow morning
10-11 am if that works with you? I love the transmission, remember this is the
first time I drove a type A. Wonderful. "
Now I'm not trying to start a long winded discussion here, and I'm not
suggesting that we all run out and buy Redline MT90. I'm just suggesting that,
in the event you have a newly rebuilt 'A' type that sticks in overdrive, you
might consider changing the fluid.
I'll report on how this "fix" works on the second transmission when that owner
makes the change.
And, by the way, this overdrive is developing 430 psi.
Ed Woods
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