I agree with Dave about listening for the solenoid, but before pulling
anything apart I'D check the tranny fluif level.
Jim Altman email@example.com Illigitimi non Carborundum
<http://www.altlaw.com/metro/jaltman.html> 69-TR6 76-TR7 80-TR8 W4UCK
[mailto:firstname.lastname@example.org]On Behalf Of David Massey
Sent: Monday, March 19, 2001 7:48 PM
To: Martin Secrest
Subject: While We're Talking Overdrives ...
Message text written by "Martin Secrest"
>Some advice please for an overdrive novice.
1) I have a '72 TR6 (CC759146). What kind of overdrive do I have?
2) The type of overdrive that's in my TR6 engages only sporadically. Like
when it's cold outside, but not when it's above 50F. What might be my
3) Are solenoids serviceable?
/// Optional Question///
My dog picked up something off the ground last night and ate it. What
/// End OPT///
1) Most likely you have a type A overdrive. The J-type was introduced
(along with a revised frame) in 1973. Now it is true that some cars are
titled as a year other than the year of manufacture but not even
Standard-Triumph could title a car built in 1973 as a 72.
2) The first thing to check (and the easiest) is the solenoid adjustment.
The adjustment may be borderline to the point that expansion due to thermal
expansion/contraction. Actually the real easiest thing to do is verify
solenoid operation. If you do have an A-type overdrive you can hear the
solenoid pull in with the engine stopped. Try this: put the car in 4th and
turn on the key (do not start the car). Operate the overdrive switch on
and off and see if you can hear the solenoid pull in. It should be quite
Getting back to the first thing (instead of the first first thing) after
you've verified that the solenoid is pulling in reliablly, pull off the
transmission cover and observe the solenoid operation. If the solenoid was
adjusted following the procedure in the book there is a 50/50 chance that
it will work. You may have to loosen the clamp bolt and adjust the lever
to achieve additional motion out of the shaft. In other words the book
says to adjust the solenoid so that the hole in the arm on the opposite
side of the transmission lines up with a hole in the case. Typically it is
necessary to set it so that the hole in the arm passes the hole in the case
ever so slightly for proper operation. Experimentation is called for.
3) Yes. The A-type solenoid has two coils. The pull in coil is
disconnected once the solenoid has pulled in completely leaving the holding
coil active only. There is a set of contacts within the solenoid itself
that accomplish this. If these contacts become dirty or corroded (what? in
a British car? and a 29 year old car at that?) the solenoid will not work.
So if the solenoid is not pulling in reliablly this is the place to start.
If the solenoid does pull in and the O/D still doesn;t work then go to
//Optional Question// You don't want to know.
Good luck and don't kiss the dog.
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