Hi Greg, before you start tearing things apart I would strongly recommend
that you do as much diagnosis as you can.
Try to check whether or not the voltage to the overdrive solenoid is "going
away" causing the overdrive to drop out.
A test light connected to the solenoid wire, which you can view while
driving, is quite adequate for this.
Once that test is completed you will have a much clearer idea of how to
proceed.
Michael Salter
100S (1955)
3000 Mk111(1965)
100 (1953)
AHX12 (1953)
Bugeye (1961)
http://www.netbug.net/blogmichael/
-----Original Message-----
From: healeys-bounces+msalter=precisionsportscar.com@autox.team.net
[mailto:healeys-bounces+msalter=precisionsportscar.com@autox.team.net] On
Behalf Of Greg Lemon
Sent: October 27, 2007 11:21 AM
To: healeys@autox.team.net
Subject: [Healeys] O/D Problems
As I mentioned earlier my BN1 overdrive is going wonky on me. After years
of yeoman's service. I dropped out once on a long highway trip, and that
now has quickly become the norm.
I checked the relays (BN1 has two of them, Bless Donald and his little elves
hearts) the other night they are fine so it is time to take the tunnel off
I guess, have also checked the oil level and it is fine.
The O/d shifts in fine, and at first dropped out occasionally, now over the
course of a few weeks ( I take the car out for maybe 3-4 drives a week) that
has gone from occassionally to pretty much anytime throttle is applied or I
go up a hill, if I really work at it I can get it to stay engaged a while.
When it goes out sometimes it drops out completely sometimes it sort of half
in/half out vaccillating.
Anyway I read a good article about the hydraulic part of the O/D that talks
about weak non return valve springs being a likely fix for low pressure.
However neither the article http://www.ntahc.org/techtips/OVERDRIVE1.html
nor my factory workshop manual identifies this part. Can anybody help point
this part out and can it be removed, service, withought completely
dismanteling the O/D? That and any other thoughts on the problem are
welcome, still hoping it is electrical, but that hope is dwindling as I test
and diagnose.
Greg Lemon
54 BN1
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