Hi,
Does anyone know the part number for the actuators, and can they still be purchased new?

I cleaned up my old stock ones and re-installed them on my newest rebuilt engine. Atkins sleeves, new C-clips, silicon grease on all these parts.

While manipulating the actuators I have the problem where they do not return fully to their stops!

I have been spraying the shafts with WD-40 for multiple times and moving them in then releasing them. They still do not return fully!

After 35 years I think the return springs inside have weakened over time. There is a long screw at the back of the actuator held in place by a jam nut.
Is this an adjustment of the spring tension? Can I increase the tension by screwing it in? Will this affect the opening PSI needed to move the sleeves?

Any help will be appreciated.

P.S. I am going to remove the actuators and polish the shafts more. Perhaps it will solve the problem.

 

I removed the actuators and polished the shafts. Worked in a couple of drops of silicon oil, then re-installed the actuators.

Here are pictures of the actuators:




here is a before picture



Here is an actuator shaft from another engine

I wonder what caused this wear?


The polishing and oil seemed to have done the trick.
Now when I manipulate the actuators they return against the stops!

Just to make certain, are my stop brackets correctly installed?
The stop tabs are off center to the shaft, with the shorter end upwards as pictured, is this correct?
I can't locate any picture showing this.

 

I finally have and answer for you about the chewed up piece. Mine were fine and after just idleing in my garage developed a slight version of this. I just noticed that the rod is loose alowing it to shift back and forth with engine vibration. The other piece acts like a saw of sorts. Just be shure the bushing is tight and the other parts aren't worn. You can push in and pull out on the shaft to check.

 

Thanks, I also noticed that the C clips will get very thin over time.
This allows the extra clearance to allow the vibration to cause the wear I found.
So, if you push and pull the shaft you will feel the extra play before it causes any problems.
Little things like this do matter over time.