[Healeys] Overdrives

Editorgary at aol.com Editorgary at aol.com
Tue Jul 22 13:14:42 MDT 2008


>From philritten
You have all mentioned not to back up while in overdrive. What if you 
accidently flip the overdrive switch while idling in your garage?

As everyone has noted, with the system operating properly, there is a switch
near the base of the gearshift on the transmission that breaks the overdrive
circuit when the gear shift lever is moved oer into the first/second slot,
effectively preventing the overdrive from operating in either of those two
gears
or reverse (which is, of course, beyond the 1/2 slot).
HOWEVER,
Should the overdrive be engaged with the vehicle moving forward, it is
possible to get the car into reverse and start the car moving in reverse
before the
overdrive gears have had a chance to disengage. Then, if you immediately start
to move forward again at high speed, you can cause the overdrive gears to
break with a very loud boom.
If this set of circumstances seems unusual in the extreme, ask me how I know
for sure that it can occur.
Moral of the story: Try to remember to shift the car out of overdrive when
slowing down, such as when you're coming off the highway by mistake on an exit
that goes directly into a parking lot. Then try to remember not to rush your
shifts into and out of reverse when you try to get back out of the parking lot
and on to the highway to catch up to the rest of your group.
(the good news out of this story was that I was able to replace my grenaded
1960 overdrive with a 1957 overdrive which gives me a better cruising speed on
the highway.)
Cheers
Gary


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