8V71 high idle air actuator

[Fredward]

The actuator that puts the governor up on high idle was working occasionally and leaking air when actuated. So i took it apart and replaced the O ring on the piston with a standard O ring from my parts bin. Put it back together and tested it; it works better now but still seems to leak a little - I mean I can feel air leaking out of the back end of the actuator. There is a C clip that holds the top on the cylinder but no other seal at that end. Am I missing another O ring or does it require a special flat sided O ring on the piston? Now that I think about it; the O ring on the piston was why the actuator worked intermitently. I must be missing some sort of seal on the end of the acutator where the air line attaches maybe?

Fred

[Barn Owl]

A new piston seal is inexpensive and easy to install. It is more like a cup, and the air pressure helps it seal.

[luvrbus]

 Fredward, do you have Jake's with the high idle cylinder or does your cylinder screw into the governor housing or set on top with a lever

[Fredward]

it screws into the side of the governor. There is also a piston on the top but thats just to keep the accelerator from acuating the throttle.

Also there was no "cup" in there. just an O ring on the piston itself. maybe I'm missing a part?

[Mrbill4108]

Here are Break down views of the Shut Down & Fast Idle Solenoids.
Hope this helps,

[Fredward]

This is excellent. I might be missing one O ring. I replaced the one on the piston but there is one more on this diagram that I might have missed. By the way it works great now. We're on a trip right now and its working flawlessly.