Gary:
This happened to a friend of mine awhile back - overdrive wouldn't
disengage, but if he wailed 5 - 10 minutes, upon starting the car again it
was out of overdrive. Turned out that there was a small bit of crud in the
operating valve which was partially blocking the oil vent holes that allow
the overdrive to realease. This may not be your friends problem, although
the symptoms are somewhat the same, and it's relatively easy to check with
the trans/OD in the car , with the tunnel cover off.
Simply remove the operating valve plug, spring / plunger, ball, and the
valve, and thoroughly inspect and clean the valve itself. Work carefully -
you don't want any damage to the ball or valve, otherwise it won't seat
properly on re-assembly, and the overdrive may not go in.
It's worth a try because it's easy. If no success, it's likely that the
problem is internal, and things will have to come apart for diagnosis.
Let us know.
Earl Kagna
Victoria, B.C.
BT7 tri-carb
BJ8
----- Original Message -----
From: <warthodson@aol.com>
To: <healeys@autox.team.net>
Sent: Sunday, June 06, 2010 6:57 AM
Subject: [Healeys] Overdrive problem #1
A friend's JB7 overdrive has stopped releasing (stopped going out of
overdrive). Electrically, everything is operating correctly. On rare
occasions
it will release but 90% of the time it stays in overdrive. He knows to not
back up with it stuck in overdrive. When he stops the engine, we rock the
car
backward & forward in gear until the overdrive releases with a bang. What is
the likely cause of this & are there any tests that we can perform of fixes
we
can do with the overdrive/transmission in the car?
Gary Hodson
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