Mark,
I have seen many types of OD failures, mostly adjustment related. The key is
to measure valve lift and use that metric as final confirmation of adjustment.
My service manual almost falls open to page G/6 (BN1 section) for these words
"the ball should be lifted 1/32 in. (0.794 mm.) off its seat when the
overdrive control is operated".
I personally go for a little more lift, maybe 1/8 in.
All the other adjustments are subject to error. For an illustration see Fig 6
"Operating Valve". Also make sure the solenoid plunger does not have more than
1/4 inch fall per figure 8. I use a brass screw inserted into the hold below
the plunger to adjust fall. Some people use a nylon screw. I faintly recall
that a 10-32 screw works well.
Best Regards,
Jim LeBlanc
1956 100-M
--- On Thu, 8/19/10, Mark LaPierre <lapierrem@sbcglobal.net> wrote:
From: Mark LaPierre <lapierrem@sbcglobal.net>
Subject: Re: [Healeys] Intermittent OD failiure
To: healeys@Autox.Team.Net
Date: Thursday, August 19, 2010, 3:08 PM
Resent email-----
> This is one of the many finicky areas of our LBCs. Let me share my
findings.
>
> Trany tunnel off,
> new solenoid, new harness, all components working as needed, adjustment on
the side of trany done
> as per manual. Go for test drive with tunnel cover off and test
everything. No OD operation.
> Go back to man cave and readjust operating valve on side. Now getting
intermittent OD. Back to man
> cave and readjust again. Now getting OD.
>
> My problem was the touchy , mind blowing , stress testing, adjustment of
the operating valve.
> Over time the operating parts start to wear and we need to over compensate
in this adjustment.
> If you are sure all else is working right then this is where I would look.
>
> The solenoid can be tested here too by turning on the key , flip the dash
switch ON and move the shifter into third or forth.
> The solenoid should click on and be at its highest level.
> Also at the same time when you turn off the dash switch the solenoid should
kick out AFTER the
> the gas pedal is pushed down so far. Don't leave the ignition switch on
too long.
>
> Good Luck, when you get this going you have passed the Healey patience
and life time stress test.
>
> Mark
>
>
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