The workshop manual describes it nicely. The throttle switch (when set
correctly) requires the driver not only to turn the o/d switch off, but also
to increase the revs to be able to drop the overdrive unit out of
engagement. This increase in engine speed meets the downshift out of
overdrive smoothly instead of shocking the entire drive line as it drops
back to normal.
Early MGB's used a vacuum switch for the same purpose.
Rich
-----Original Message-----
From: healeys-bounces@autox.team.net [mailto:healeys-bounces@autox.team.net]
On Behalf Of Herbert Miller
Sent: Thursday, November 04, 2010 3:40 PM
To: healeys@autox.team.net
Subject: [Healeys] overdrive
I took my BJ8 out for a test drive the other day, and the overdrive worked
just fine. When I got back, and opened the hood, I noticed that I had not
replaced the actuation rod between the throttle linkage and the overdrive
throttle switch. Then I got to thinking. I have a Jaguar MK11 sedan and a
couple of MGB,s with basically the same OD. Neither make has a overdrive
throttle switch and they seem to work just fine. I don't know about TR,s or
Volvo,s that also used the same basic OD. Why does the Healey use this
switch?
Herb Miller
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