rebuilding vacuum control

[broker-len]

31 plymouth     distributor control    bad diaphragm      have it apart    has any one done one    what material did you use--thanks ---------------------------  bobnroman@yahoo.com

[DonMicheletti]

I have rebuilt them before. I used a thin silicone sheet that had fabric imbeded in ti. it was very thin. I doubled the diaphragms and used a silicone sealer around the edge on assemblt. Unfortunately I have forgotten where I bought the stuff - maybe Mc Master Carr.

One was over 30 years ago and it is still working fine.

[Owen_Dyneto]

Depending on how well the substitute material matches the original with regard to flex properties you may have to recalibrate the spring/shim pack to match the OEM specifications.  Best done on a distributor test machine like a Sun.

[broker-len]

thank you both      I realize the spring will have to be adjusted but getting the material was my question   here is an example of the one I am working on

[Digger914]

The cars I do are new enough to be infested by these things and old enough that you can't buy a new replacement for love nor money. My source for new diaphragm material comes from similar sized donor vacuum modules harvested from 80's and 90's AC systems at the U-pull yard.

[Roger Zimmermann]

I believe Terrill Machine in Texas is rebuilding those vacuum control parts.

Edited June 1, 2016 by Roger Zimmermann (see edit history)

[Restorer32]

Terrill has done several for us. Nice work.