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Long ago I worked on a clutch fan on a 340 Formula S cuda. That 'spring', the coiled
thing in the center, is a bi-metal material that coils tighter as it gets hot and uncoils
when it gets cooler. The 'coiling' turns the little shaft in the center which opens and
closes the valve inside. Inside is a heavy viscous silicone fluid and a mechanism that
kinda works like an auto transmission torque converter when its hot the valve causes
the fluid to drive the fan at waterpump shaft speed down to freewheeling as the
engine cools.
In my case the valve failed and allowed freewheeling most of the time ;-) I had to
replace the clutch itself. They can be bought separate from the fan blades so just
buy that if you find it is bad....
As another option look into an electric fan. Besides solving your cooling problem, it
will free up a batch of horsepower ;-) Get one of the ones with the curved blades
that look like a submarine propeller - they run much quieter and take less electric.
The electric kind is what I have recently been looking at on ebay for my new 62 F85
which Ive been told is likely to run hot in the summer time.
Also check your radiator cap. Use the recommended presure - if it leaks then the
fluid boils and that will cause overheating bigtime.
Hope this helps....
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