Re: [AMC-list] 1981 Spirit 6 cyl air intake trap door vacuum motor failed (more)

[Joe Fulton <piper_pa20@xxxxxxxxxxx>]

If you can remove that diaphragm I'd suggest you try to replace it with a 
similar thickness of rubber.   Jobber houses like McMaster Carr offer sheets of 
rubber in various thicknesses for industrial uses.  You might also find an old 
inner tube that would work.    Also, you could check with one of the antique 
carburetor repair shops to see what rubber they use for rebuilding vacuum 
advances.  These are just suggestions.  I dont' have any experience with a 
similar repair.  I might have a spare air cleaner that would work though.  


Joe Fulton



----- Original Message ----
From: "gqrxzy8974@xxxxxxxx" <gqrxzy8974@xxxxxxxx>
To: amc-list@xxxxxxxxxxxxxxxxx
Sent: Wed, July 4, 2012 11:55:00 AM
Subject: [AMC-list] 1981 Spirit 6 cyl air intake trap door vacuum motor failed 
(more)

This was previously posted on amcyclopedia.org but didn't
appear as I expected on the amc-list, so I'm reposting
it directly to amc-list with later information.

I've a 1981 AMC Spirit 6 cyl and the air intake trap door 
vacuum motor has failed. The vacuum motor doesn't move
with vacuum applied and doesn't hold vacuum either.

The trap door moves freely (not bound up) and since it 
opens in toward the carburetor intake, perhaps the engine
air suction also opens it since the car runs (mostly).

Is there a source for a replacement (or is it possible 
to repair?)?

I've since removed trap door motor and uncrimped it to
open it.  The internal rubber diaphragm has a small tear
in it at the point it folds.  I've thought of patching
this with some sort of glue (no patch, just glue).

Searching on the web I found hits unrelated to AMCs 
but for other diaphragms suggested either gorilla glue
(polyurethane) or Permatex Ultra Black Silicone.

I'm also thinking of annealing the single metal part
which gets crimped to try to avoid the crimps breaking
off when recrimped.

Any suggestions or comments?

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