Hi All,
Sometimes even after rebuilding or replacing your vacuum select switch, you may still have a hiss from the switch. Many times this is caused by the
aging of the clear silicone 'harness' that attaches to the switch. Following a tip I found on the 3rd Generation F Body site, I fixed the link easily,
safely, and for pennies.
Small silicone fuel line tubing for RC cars/boats/planes is available at hobby stores. One foot cost me 69 cents. The thin tubing will stretch a great
deal. When slipped over one or more of the nipples on the back of the switch, it will add just the right amount of thickness to compensate for the
aged harness silicone and allow it to seal again.
I cut pieces to a little less than 1/4 inch and snugged them down on the 9 vacuum port nipples. A little Lubriplate or plumbers grease applied to the
silicone harness holes with a q-tip helps it slide right on and seal even better.
The hiss is now gone, and it's quiet and working correctly again.
I posted the pictures at http://www.gmcmhphotos.com/photos/g7174-vacuum-select-switch-harness-fix.html to help better explain the above.
-Dave
--
1978 Transmode (403)
Pittsburgh, PA
Sometimes even after rebuilding or replacing your vacuum select switch, you may still have a hiss from the switch. Many times this is caused by the
aging of the clear silicone 'harness' that attaches to the switch. Following a tip I found on the 3rd Generation F Body site, I fixed the link easily,
safely, and for pennies.
Small silicone fuel line tubing for RC cars/boats/planes is available at hobby stores. One foot cost me 69 cents. The thin tubing will stretch a great
deal. When slipped over one or more of the nipples on the back of the switch, it will add just the right amount of thickness to compensate for the
aged harness silicone and allow it to seal again.
I cut pieces to a little less than 1/4 inch and snugged them down on the 9 vacuum port nipples. A little Lubriplate or plumbers grease applied to the
silicone harness holes with a q-tip helps it slide right on and seal even better.
The hiss is now gone, and it's quiet and working correctly again.
I posted the pictures at http://www.gmcmhphotos.com/photos/g7174-vacuum-select-switch-harness-fix.html to help better explain the above.
-Dave
--
1978 Transmode (403)
Pittsburgh, PA
