[Fot] A-Type Over Drive Question Again

[Jay Galbreath]

MT-90 oil cured my rebuilt OD non release condition. It instantly fixed the
issue. I continue to use it years later without a problem.
Jay Galbreath
WPTA

On Wed, Jan 1, 2020 at 8:23 AM Glenn Franco via Fot <fot at autox.team.net>
wrote:

>
>
> On Wed, Jan 1, 2020 at 7:56 AM Tim Hutchisen <hakhutch at roadrunner.com>
> wrote:
>
>> Hi Glenn,
>>
>> Having built numerous OD units, I have run into a couple of instances
>> where the cone clutch needed to "bed in". If you installed a new cone
>> clutch, the angle of the linings may not be an exact match to the brake
>> ring and annulus and it will stick when applied. A good swift rap (or two
>> or three) on the exterior of the brake ring with a dead blow hammer will
>> release the clutch. Had this happen with Henry Frye's race car at Summit
>> Point a few years ago. Driving around the paddock with the gearbox cover
>> off and excersising the OD, releasing it with the dead blow hammer. It
>> eventually worked it's way in with time.
>>
>> Tim Hutchisen
>>
>> Penn Ridge Motors
>>
>> Norway, ME
>>
>>
>>
>> *From:* Fot [mailto:fot-bounces at autox.team.net] *On Behalf Of *Glenn
>> Franco via Fot
>> *Sent:* Thursday, December 26, 2019 5:04 PM
>> *To:* FOT list <fot at autox.team.net>
>> *Subject:* [Fot] A-Type Over Drive Question Again
>>
>>
>>
>> Happy New Year
>>
>> Quick Question
>>
>> I have rebuilt numerous A-types over the last few years, but I have one
>> that's been giving us fits.
>>
>> Transmission was a TR6 and the mainshaft was replaced with the proper
>> overdrive shaft for the A-type.
>>
>> The A-type appears to be an early one with steel piston rings on the
>> apply pistons.
>>
>> The pump was replaced and puts out +300 psi during testing.
>>
>> The overdrive and trans was tested by back spinning from the tailshaft
>> flange with an electric motor.
>>
>> The overdrive appears to be engaged and it appears that the pressure will
>> not drop.
>>
>> The pressure relief at the pump was removed and the accumulator was
>> loosened to relieve the pressure.
>>
>> Now trans in neutral the output shaft of the overdrive appears to be
>> locked up and will not spin.
>>
>> Any ideas??
>>
>> Thanks in advance
>>
>> Glenn
>>
>>
>>
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