The Stovebolt Site Forums The Shop Area Engine Shop Exhaust Manifold Internal Deflector or Flapper

Gents,

I've reviewed prior posts on this topic, and can't quite find a post that deals with this directly.

I removed the manifold assembly from my '47 216 and finally was able to free up the exhaust gas deflector. (I used carb cleaner, PB blaster, and tapped it for and aft with a small ball peen hammer - no heat.) Once this was done, the spring was "slack" or resting about 45 degrees ccw from the pin. I completed the wind (tightened it an additional 315 degrees ccw) and set it on the pin.

The deflector has a positive bias to the "closed" (heating the intake) position, but now moves freely.

My question is, is this wound too tight? Where should the spring "rest" once it's been unpinned?

Thanks in advance for the help.

Bill

This may help.

http://chevy.oldcarmanualproject.com/shop/1947truck/47ctsm0618.htm

Sounds like someone put it on 180 degrees out of position.

Yes it's to tight. It should just hold the butterfly closed long
enough for the bi-metal spring to relax and allow it to open to
the exhaust pipe. By the time this happens the floor of the
intake should be warm enough to vaporize the fuel droplets.
I think Carl has it right, the thermostat was installed
180° out of phase.

dg

I know I saw a better example in one of the Old Car Manual project but Here is the page from the 42 book. Same thing more or less for reference sake.

Helpful as usual!

Thanks guys!

Bill