[DeTomaso] Fwd: heater valve rebuild seal

[Mike Drew]

All,

Stephane Bergeron in Paris had a leaking heater valve in one of his Panteras. There were several different styles of heater valve used.  The Ford parts book shows the different valves in the different drawings but inexplicably only shows a part number for the final version. 

The later valve uses a push-pull plunger arrangement while (apparently) the earlier ones used a more traditional rotary action, which in my experience doesn’t work nearly as well. In fact on both our cars, the early valves are stuck open (they can me forced closed directly, and opened by moving the lever on the dash,mbjt can’t be closed with the lever). 

The later valve is more prone to leaking, I believe, and historically when they failed most a Pantera vendors offered a generic rotary valve as a replacement. But Stephane actually found the exact seal which has a standard part number, so now anybody can rebuild their heater valves. See below:

> Subject: Re: heater valve

(1)

Here’s a picture of the cracked seal hence the leak around the M4 shaft.

The outside diameter of the seal is 9.5mm or…3/8”

Hope we can find this type of lip seal.

For info it has no spring inside like big lip seals.

For the Panteras I noticed at least 4 different models for the heater valve.

The very first ones were Alfa Romeo, but this one is a Ford...

Anyone knowing which model, US or European in the early 70’s ?




And then, today:

(2)

> 
> FYI I finally found a seal that fits, NBR 4X10X4 making this heater valve fully serviceable, no more leaks :<)
> 
> Stephane.
> 
> 
-------------- next part --------------
   All,

   Stephane Bergeron in Paris had a leaking heater valve in one of his
   Panteras. There were several different styles of heater valve used.
   The Ford parts book shows the different valves in the different
   drawings but inexplicably only shows a part number for the final
   version.

   The later valve uses a push-pull plunger arrangement while (apparently)
   the earlier ones used a more traditional rotary action, which in my
   experience doesn't work nearly as well. In fact on both our cars, the
   early valves are stuck open (they can me forced closed directly, and
   opened by moving the lever on the dash,mbjt can't be closed with the
   lever).

   The later valve is more prone to leaking, I believe, and historically
   when they failed most a Pantera vendors offered a generic rotary valve
   as a replacement. But Stephane actually found the exact seal which has
   a standard part number, so now anybody can rebuild their heater valves.
   See below:

   Subject: Re: heater valve

   (1)

   Here's a picture of the cracked seal hence the leak around the M4
   shaft.
   The outside diameter of the seal is 9.5mm or...3/8"
   Hope we can find this type of lip seal.
   For info it has no spring inside like big lip seals.
   For the Panteras I noticed at least 4 different models for the heater
   valve.
   The very first ones were Alfa Romeo, but this one is a Ford...
   Anyone knowing which model, US or European in the early 70's ?
   image0.jpeg image1.jpeg image2.jpeg
   And then, today:
   (2)

   FYI I finally found a seal that fits, NBR 4X10X4 making this heater
   valve fully serviceable, no more leaks :<)
   Stephane.
   IMG_8012.jpeg
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image0.jpeg
Type: image/jpeg
Size: 118978 bytes
Desc: not available
URL: <http://server.detomasolist.com/pipermail/detomaso/attachments/20220901/5ca083d7/attachment.jpeg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image1.jpeg
Type: image/jpeg
Size: 46223 bytes
Desc: not available
URL: <http://server.detomasolist.com/pipermail/detomaso/attachments/20220901/5ca083d7/attachment-0001.jpeg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image2.jpeg
Type: image/jpeg
Size: 70471 bytes
Desc: not available
URL: <http://server.detomasolist.com/pipermail/detomaso/attachments/20220901/5ca083d7/attachment-0002.jpeg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: IMG_8012.jpeg
Type: image/jpeg
Size: 89816 bytes
Desc: not available
URL: <http://server.detomasolist.com/pipermail/detomaso/attachments/20220901/5ca083d7/attachment-0003.jpeg>