Vacuum actuator valve.
Thread Starter
Racer
Joined: Jul 2008
Posts: 301
Likes: 5
From: Youngstown NY
Vacuum actuator valve.
I believe I have a bad actuator valve here's why. When I put vacuum to the valve through the yellow supply port with no vacuum to the white control port I should have vacuum through the green open port. I can not build vacuum through the green port so I believe the actuator valve is leaking. When I put air through the yellow port and plug the green port the air leaks out the exhaust. Do I need a new valve?
Racer
Joined: Jan 2014
Posts: 334
Likes: 6
You may be right!
Here is a link to a tutorial I wrote a while back about testing these relays:
https://www.corvetteforum.com/forums...s-of-pics.html
I believe this method is the only way to be sure.
Good luck!
Here is a link to a tutorial I wrote a while back about testing these relays:
https://www.corvetteforum.com/forums...s-of-pics.html
I believe this method is the only way to be sure.
Good luck!
Melting Slicks
Joined: May 2015
Posts: 2,365
Likes: 428
From: Cape Girardeau Missouri
You have to block the green port (a finger will do) while you apply vacuum to the yellow. It should then maintain vacuum indefinitely.
Next apply vacuum to the white port and release. Do this a few times. You should hear a piece inside move when you release the vacuum.
Finally put a tube to the white port and apply vacuum. Clamp the tube fully shut. Block the red port and apply vacuum to the yellow. It should maintain vacuum indefinitely.
Next apply vacuum to the white port and release. Do this a few times. You should hear a piece inside move when you release the vacuum.
Finally put a tube to the white port and apply vacuum. Clamp the tube fully shut. Block the red port and apply vacuum to the yellow. It should maintain vacuum indefinitely.
Drifting
Joined: Jul 2006
Posts: 1,259
Likes: 154
From: Deplorableville Nebraska
If your top control chamber is holding vacuum and lifting the internal piston you need a new piston unless you want a repop relay. Here's a couple of videos I've done on how I test my relays. If you are interested in having your original one rebuilt, let me know.
Thread Starter
Racer
Joined: Jul 2008
Posts: 301
Likes: 5
From: Youngstown NY
Vac relay test
Thanks yes I did the test and the valve will not hold vacuum. I have ordered (2) from Bairs. Repops to be sure. I'll keep my fingers crossed that they are good.
Advanced
Joined: Feb 2014
Posts: 97
Likes: 16
From: Green Bay Wi.
John
