Center (above Gear well) Fresh Air Vent in M20F

[Shadrach]

1 hour ago, skydvrboy said:

I have never been able to find a way to close the air at the foot well tubes.  Mine looks like it just has a bunch of open holes with no way to close them.  Maybe I'm missing something.  It would sure be nice to be able to shut those vents holes in the foot well tubes so the copilot seat doesn't get so hot.

If you look in the IPC, you’ll see that each of those tubes should have a gate valve. It is basically a butterfly valve in the tube with a lever on one end of the shaft that allows you to rotate the valve like the throttle on a carburetor. The lever is oriented to align with the valve so that you can see if it’s opened or closed from the outside.

[Rob K]

Thanks guys.  I bought my F last year and have been wondering about this hole.  Now if you could clear up the 3 items on the right side of the pic.  A hollow metal port and 2 holes to plug something in?  Too large a hole for comms....

[Shadrach]

30 minutes ago, Rob K said:

Thanks guys.  I bought my F last year and have been wondering about this hole.  Now if you could clear up the 3 items on the right side of the pic.  A hollow metal port and 2 holes to plug something in?  Too large a hole for comms....

What year is your bird? I would start with the interior section of the appropriate Illustrated Parts Catalog.

[Rob K]

1975.  I looked at the diagrams but do not see anything there.

[TaildraggerPilot]

On 6/8/2024 at 1:13 PM, skydvrboy said:

I have never been able to find a way to close the air at the foot well tubes.  Mine looks like it just has a bunch of open holes with no way to close them.  Maybe I'm missing something.  It would sure be nice to be able to shut those vents holes in the foot well tubes so the copilot seat doesn't get so hot.

The footwell tubes (foot warmer vents) originally came with butterfly valves actuated by a simple thumb lever. I don’t have a picture of that specifically, but I can take some the next time I’m out at my hanger. My ‘67 E has the big fresh air vent and it’s glorious:

(You can just see part of the thumb lever for the left footwell heat vent on the left side of this picture - the zip tie is to reduce stress at the tube seam)

 

Edited August 28 by TaildraggerPilot
Added last note