[Mgs] Overdrive does not work when it is hot

[Schauss, Peter (IT Solutions)]

I have found that the isolation switch which Moss is currently selling
is a bit too short even when installed without shims.  The original
switch
which came with my rebuilt gearbox/overdrive worked for about a year and
then started to disconnect intermittently (and finally completely).  A
replacement
from Moss which looked like the same switch lasted about a year.  I
replaced it with
a switch scavenged from my old gearbox which, so far, has works.  As an
added
advantage, the new switch gives me overdrive in third and fourth gears
(but not in reverse
or first and second).

HTH,
Peter Schauss
1980 MGB

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Message: 4
Date: Tue, 31 Aug 2010 03:21:15 -0500
From: Charley & Peggy Robinson <ccrobins at ktc.com>
Subject: Re: [Mgs] Overdrive does not work when it is hot.
To: "Andrew B. Lundgren" <lundgren at byu.net>
Cc: mgs at autox.team.net
Message-ID: <4C7CBB7B.9010700 at ktc.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Don't know which OD you have but there's a switch on mine that prevents
the OD from engaging 1st & 2nd gears.  This switch is adjustable as to
the depth that is seats into the housing.  Sometimes heat expansion will

cause the switch contacts to open up.  You might try turning it in a
half turn or so.  It's located on the upper left side of the gearbox.  A

quick check is to bypass that part of the wiring harness on the box.
Just run a wire direct to the solenoid.  I did this on my '70B so as to
have OD in all 4 forward.  Playing around.....  Be careful though, this
is also the reverse lockout switch, AIR. ;-)

CR