Fred:
As Alan B has said, the overdrive is not releasing, or at least not
releasing immediately.
One thing that can be checked relatively easily: The operating valve's
bleed hole might be partially blocked or mostly blocked. Symptoms are: The
overdrive will hang up for awhile after the switch is moved to the off
position, but if the car sits for awhile - say a few minutes - the overdrive
will release. You can pull the operating valve from the top and check to
see if there is any debris inside - it's basically a hollow tube. The bleed
hole is very small - it doesn't take much crud to cause an obstruction. The
workshop manual describes it's removal quite well, but makes no mention of
the bleed hole.
This happened to a buddy's Healey awhile back - fortunately we diagnosed and
corrected the problem before major damage was done to the one way clutch
inside the overdrive as Alan B has suggested might be the case.
Let us know.
Earl Kagna
Victoria, B.C.
BJ8, BT7 tri-carb
-----Original Message-----
From: Fred Wescoe
Sent: Tuesday, August 06, 2013 11:20 AM
To: healeys
Subject: [Healeys] Transmission?
Listers,
Last week I backed my BJ7, with overdrive, out of the garage and got a
short sound of scream/grind from what I thought was the rear end. I pulled
back into the garage. I drained the transmission and overdrive oil as well
as the differential oil thinking either could be low and in need of a
change. I pulled an axle and checked it. Nothing apparent. No oil
showing on the brake drums. I checked the u-joints and there was no
looseness seen.
I refilled the transmission, overdrive and axle with Red Line oils. The
car was on jacks all the way around. I started the engine and let it warm
up and then put it in gear. I tried 1st, third and reverse. No sounds of
problems with or without the overdrive switched on.
This morning, I backed out of the garage and went a few miles. I stopped
at a friends home to pick up something. Put the car in reverse and
instantly got the scream/grind sound. I made sure the overdrive was
switched off and tried again with the same results in both reverse as well
as all forward gears. I turned the car off and tried again, this time no
sound. I drove the car home with no problems.
What do I start looking for? Is it possible that the overdrive is not
disengaging even with the switch off?
Help!
Thanks in advance,.
Fred
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