"Loose" carb heat

Steve Brown · #1 06-21-2008, 03:26 PM

My carb heat works so easily that at high airspeeds the door will open back up on its own. Any suggestions for tightening this up?

petehowell · #2 06-21-2008, 04:48 PM

Steve,

Had the same issue on my -9a. Install a button lock cable from ACS. Should have come from the factory like this. Search Archives on button lock.

Steve Brown · #3 07-03-2008, 06:02 PM

Button lock looks like a good idea

647jc · #4 07-03-2008, 06:30 PM

I just did that, used ACS part:

A-700 button lock control 72" black knob 05-13172 $42.70

Had to slightly enlarge panel hole but other than that no problems.

Steve Brown · #5 05-10-2009, 01:51 PM

The arm that hooks to the door on mine has two holes. Originally my cable was hooked to the hole closest to the pivot point. So, leverage from the cable pulling on the door was low, but leverage from the door pulling on the cable was high.

I moved it to the other hole to reverse that situation.

I had to replace the cable with a longer one because the total movement is significantly more that before. Also, the cable pulls out slightly past the last detent.

Now the carb heat will not slip back in, even at cruise speed. Opening and closing is easier than before.

At some point I might modify the arm to have a location just slightly closer to the pivot point, but for now its fine.