----- Original Message -----
From: David Ward
To: David Ward
Sent: Thursday, May 03, 2007 7:58 PM
Subject: Re: overdrive problem
Hello Richard,
sorry to hear of the problems that you are having with your model A Laycock
overdrive.
>From the way that you describe the symptoms that you are experiencing you have
without doubt a total loss of hydraulic pressure, as the oil warms up and the
viscosity level drops, the problem becomes even worse. As the pressure builds
up the overdrive activates and engages, this then drops the pressure to such a
level that the overdrive disengages, this in one simple word is not doing the
clutch a great deal of good really, so to save this expensive part we had best
come to the reason.
Without doubt the problem lies within the accumulator and it's operating
piston.
You can replace this with the overdrive unit in situ, when I replaced these
withdraw the accumulator and it's operating piston, I found that a large pair
of circlip pliers to be ideal it "may" only require new "O" rings but if you
require the complete unit from memory they are roughly #50-00GBP [ $100US ]
Even better idea is to go obtain the complete assembly out of a MK11 Jaguar
overdrive, these had the large piston and they will come in much faster.
Also if you desire to disengage the overdrive much quicker as you operate the
electrical switch simply open up the small hole in the side of the operating
valve push rod, this will allow the overdrive unit to "dump" the oil much
faster.
GOOD LUCK.
Kindest Regards.
David.
----- Original Message -----
From: David Ward
To: David Ward
Sent: Thursday, May 03, 2007 7:08 AM
Subject: Fw: overdrive problem
----- Original Message -----
From: dick gaier
To: david@bighealey.ltd.uk
Cc: Tom felts
Sent: Wednesday, May 02, 2007 10:00 PM
Subject: overdrive problem
Hi David
A friend of mine was on the Healey network asking a question regarding my 66
BAJA overdrive problem and he thought you might be able to help.
.
The overdrive will work well when the outside temperature is cool. That
means if the overdrive switch is in the down position which is in overdrive
and I am cruising around 50 or 60 MPH everything is fine, If I slow to 40 or
slower the overdrive will kick out and the revs go up which is ok.
Now when the outside temperature starts to climb and the engine starts to
heat here is what happens:
Cruising around 50 or 60 and the switch is in the down position for
overdrive the overdrive will wander in and out when I leave off the
throttle... it seems to be "searching".. Is does not stay in overdrive.
In order to get out of this "searching" I have to push in the clutch and
snap the switch out of overdrive.. It's very annoying.... I hope I am making
myself clear.
I change the overdrive oil and clean the filter every year and use 30 -40 wt
non detergent oil.
Any suggestions...
Thanks in Advance and Cheers,
Dick Gaier.
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