[Fot] J-type overdrive reluctant to disengage

[Steve Yott]

Scott<
I would agree that it is not an electrical issue.  In order of ease in
troubleshooting:

1- The solenoid is fairly reliable in a J-Type but I have seen a couple of
them stick in the "on" position after power is removed.  This is a not good
situation because you could have the overdrive engage in reverse and destroy
the overdrive.  The best way to isolate this issue is with a pressure gauge
and ensure that the pressure drops to under 40 lbs with the power removed
from the solenoid.

2- Clogged release orifice is very possible but yes the overdrive would need
to come out.  For a race car this should have been opened up to 1-mm in
diameter for faster release of the overdrive.  This can be seen with a
pressure gauge.

3- Sticking cone clutch.... this is a very definite possibility and is very
common if the proper finish is created on the brake ring upon overhaul.

If needed you can remove the unit and bring it down a bit south to Silver
Lake, WI and I would be glad to tear it down and fix it.  I also have a
powered test stand for working on these units.

Steve Yott

-----Original Message-----
From: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] On
Behalf Of Barr, Scott
Sent: Wednesday, August 14, 2013 9:04 PM
To: fot at autox.team.net
Subject: [Fot] J-type overdrive reluctant to disengage

So I have my new J-type overdrive trans in the Spit and took it out down the
back road near my house tonight.  The overdrive engages and sometimes
disengages.  But a lot of the time it remains in overdrive despite flipping
the switch off.

The trouble shooting section of the manual lists several possible causes
(none of which I like because they sound like removal of the trans).
Sticking solenoid, sticking cone clutch, clogged control orifice, faulty
wiring.

I wouldn't think wiring is the issue if it works right some of the time.
Any chance this relates to running it at lower revs than I would on track?

Freshly rebuilt box from Quantum Mechanics, John Esposito.

Scott Barr
McCarty Law LLP
(920) 257-2233
sbarr at mccarty-law.com<mailto:sbarr at mccarty-law.com>
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