-----Original Message-----
From: John & Allison Cyganowski <janah@att.net>
Sent: May 3, 2005 5:57 PM
To: 6pack <6pack@autox.team.net>
Subject: A Type Overdrive HELP!
Hi All-
Some of you know that I have been having trouble with my A type overdrive.
The OD was intermittent, now it seems to be out for the count.
I have replaced the oil. When I replaced the oil, I did see a little gray
sludge at the drain plugs. I also found the ends of a broken snap ring
lodged on the magnetic washers.
My OD harness is melted. It was in this condition when I purchased the car
at which time the OD functioned. It would seem that at sometime in its life,
the solenoid was drawing high current.
....edited...
John,
The first thing to do is to check if the overdrive solenoid is working. My
intermittent overdrive problem was caused by the missing solenoid plunger rest
stop. The plunger was falling too far down and sometimes becoming cock eyed in
the solenoid bore causing the overdrive not to engage. To check if the solenoid
is working:
1. Manually move the overdrive engagement lever up and down by hand.
2. Apply 12 volt dc to the yellow/purple wire of the yellow/purple and
yellow wire wiring harness going to the transmission cover in the right foot
well. This is the power wire for the overdrive solinoid.
3. Visually check that the solenoid plunger lifts the overdrive engagement
lever up fully. There is an audible click when it works properly in a quiet
background.
To check that the overdrive unit works without the use of the solenoid:
1. Remove the metal overdrive access cover on the original cardboard
transmission cover on the left side. Or remove the transmission cover
completely.
2. Tie a piece of string the end of the overdrive engagement lever. Check
to make sure that the lever moves up fully when one pulls up on the string.
(removal of the solenoid is optional)
3. Drive the car and pull up on the string when in 2nd, 3rd or 4th gear.
If one decides to operate the overdrive in this manner for a period of time,
tie a paper clip to the other end of the string. Hook the paper clip to the
console center support left bolt hole so that the engagement lever is held in
the up position.
I installed an inline fuse holder in the yellow/purple power wire for the
overdrive solenoid in the right footwell above the transmission cover. I use a
4 amp fuse. If my memory works right, the solinoid draws about 7 to 10 amps
maxinum before burning up. I rewound the solinoid myself several times before
figuring my problem out.
Warning to the use of the above for operation of the overdrive unit by string!
The overdrive unit does not work in reverse gear! Yes, it works in first gear.
If one has the overdrive unit engaged and shifts into reverse gear, the
transmission locks up until one shifts out of reverse and unhooks the paper
clip.
For what its worth.. DON'T PANIC,
Greg Perry
72 TR6 A type
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