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RE: Switches can bleed!

To: "Dodd, Kelvin" <>
Subject: RE: Switches can bleed!
From: Hans Duinhoven <>
Date: Mon, 31 May 1999 08:03:55 +0200
Hi Kelvin,

I've got a Moss repair kit via my local dealer.
The O-Rings were perfect - anyway they fitted correctly.
The switch however does not fit.
What I got was Lockheed partnr LV17716 switch.
It looks very much the same, but the difference is around the actual
actuator and screwthread.
The depth is deeper as well, so the fit is not right at all
It comes, because the plastic at the screw thread does not stop the end of
the thread, but goes about 8 milimeter deeper. Anyway the switch does not
In an older USA Moss catalogue I found the total assembly partnumber is
My local dealer thinks the original BL partnumber for the switch is 37H8089.
He thinks I have had 141-725.

The original switch has no number on it, just the text Autolite and on the
switch collar there is the name Amp.

My car's data:

Car number      GHDUB239829G
Model year      1971-2
Rest            not important I assume

Please can you give me advice what the correct partnumber is?
Thank you in advance.

Best regards,


'71 BGT         What's better - a leaky switch or a non-fit one

> -----Original Message-----
> From: Dodd, Kelvin []
> Sent: Wednesday, April 28, 1999 6:29 PM
> To:   Hans Duinhoven
> Cc:
> Subject:      RE: Switches can bleed!
> Hans:
>       There are two types of seal found in these units.  O ring or cup.
> The kit listed in the Moss catalog will repair the o ring type.  I am not
> aware of any kit that contains the cup type seals.  The kit contains two
> pairs of O rings and the copper washer for the end plug.  Repair is
> simple.
> Kelvin.
> > 
> > Hi MG guys & dolls!
> > 
> > When filling the brake system of my '71 BGT I found, that a 
> > switch really
> > can bleed.
> > Hydraulic fluid came out of the differential pressure warning 
> > switch of the
> > dual brake system. A repair kit under partnumber 181-985 is 
> > listed in the
> > Moss catalogue.
> > 
> > According to my local part supplier a repair kit may solve 
> > the problem, but
> > he was not sure it would be succesful. (The only things which might be
> > needed are two O-rings on the piston which functions as an 
> > actuator for the
> > switch and the actual switch I think).
> > 
> > Is there anyone who has had the same experience and what was 
> > the solution?
> > Thanks in advance.
> > 
> > Cheers,
> > 
> > Hans
> > 
> > '71 BGT bleeding where it should not....
> > 

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