Max Heim wrote:
> Wow, that makes it sound complicated. I put a late OD in my 66 B and all
> I did was run two wires -- one from the fuse box to the dash switch, and
> from there to the lockout switch (on the tranny), and one from the other
> side of the lockout switch to the OD solenoid. I frankly had no idea
> there was a relay...
The later cars use smaller solenoids that don't need
relays. The thought was though that the older style solenoids
pulled too much current to run without a relay.
It's not a safety issue though, so if it works, it works. What
you might find though is too much voltage drop through the thin
wire and switch contacts to engage the solenoid. Evidently, this
isn't happening. ;>
> and a vacuum switch involved. I am not quite sure why
> there is an issue with the OD engaging with the throttle closed (which it
> seems to be the purpose of the vacuum switch to prevent).
I think it's more the opposite, to stop the OD from
disengaging when the throttle is closed.
As you probably found out, this can be kind of violent. I
have overdrive in my 75 Midget, and I don't use it in third
gear mostly for this reason. It's smooth to engage, but
if the revs are anything less than 3000rpm the disengaging
gives the car a good "snap" and sometimes makes a tire
squeal. (no problem in fourth though)
The above happens a bit actually, let's say you
go first, second, third, then overdrive third and
coast along. Then you coast into a stop light or
something, and flip out overdrive when revs are
low and foot off. Squawk!
With the vacuum switch, the car won't actually
come out of overdrive in these situations. It'll
only allow you to downshift when you are on the
throttle, like going from OD 4 to just plain 4 to
pass somebody on the highway.
I don't think it's essentual though, it was dropped
of course...
--
Trevor Boicey, P. Eng.
Ottawa, Canada, tboicey@brit.ca
ICQ #17432933 http://www.brit.ca/~tboicey/
"No offense..." is usually followed by great offence.
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