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560 Gas thermostatic valve spring

C

Chris NW Ind

Member
Just picked up a new spring this morning at $32! I have the 2 owner's manuals and the IT manual, but neither is clear on the installation of this spring. Here are my observations:

With no spring, engine running or not, the counterweight is pointed forward and I believe the valve butterfly is more or less vertical. I can rotate the valve shaft counterclockwise till the counterweight is vertical and I believe the butterfly is closed. When I hold the shaft counterclockwise with the engine running, I feel a significant amount of force tending to rotate it clockwise when I accelerate the motor. This is what leads me to believe the butterfly is closed and the pressure of the exhaust is trying to force it open.

So, my question is, how exactly is the spring installed/preloaded? If I were put it back on the way I removed it, nothing would ever happen. The valve would stay open and the spring tightening clockwise would only keep it open.

I have an engine service manual for the C263 coming, but I’m wondering what you know. I couldn’t find anything in the archives.

Thanks, Chris B.
 
The flap is to be open when the engine is cold. The open flap allows exhaust to circulate in contact with the outside top of the intake manifold. As the riser thermostatic spring heats up, it relaxes allowing the flap to close blocking the flow of exhaust toward the intake.
The flap should be pushed toward closed by the exhaust. It should be pushed towasd open by the thermostatic "spring". The diagram just does not quite get to the clarity to show the spiral direction. Best of luck, JimN
Picture
 
The heat riser spring should be about 1/4 turn of tension holding the counterweight in the vertical position when engine is cold. The conterweight should spring right back to vertical when pushed forward, and it will stay that way until warmed up some. Notice the ofset slot in end of shaft and spring also for correct alignment.
 
Thanks to both of you. What you said is what I suspected. When I first started investigating that valve, I thought I was going to have to deal with a stuck shaft. To my surprise it was loose.

Thank again, Chris B.
 
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