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Doug,
As your airplane is much older
than mine, you may have a different mixer box, but mine has an aluminum
operating arm on the outside that clamps the operating shaft. If this is even a
little loose, the arm will swing without turning the shaft…and it’s
a #4 bolt on mine…easily over-torqued. It’s possible that you
may have a bit of a burr on the HDPE used to seal across the openings. If so,
taking the thing apart and cleaning it up carefully with a sharp knife may
help. In any case, this is a pretty simple device inside. I took mine apart to
better align the overflow/dump valve for a better seal. Not difficult to work on
at all, just some care not to bend the components.
Call me if I can be of help.
Bob P
Doug Johnson wrote:
I have a mixing box problem on my IV-P which is new. On a
recent flight I pulled the cabin heat knob on in the plane, and got heat as
expected. When comfortable, I pushed the knob back in to the normal “heat
off” position, but the hot air kept coming in. After the flight, decowled
the plane to inspect, and all cables and hoses were still hooked up and
operating (the lever arm on the front of the box moved normally with someone in
the cockpit pulling and pushing the knob. I took off the hot side inlet hose
and poked a flashlight in there. It appears that the rotating opening in the disc
that rotates between the hot and cold sides was no longer rotating with axle
activated by the pivot arm. Has anyone else seen this? How easy is it to
get into this box, and am I likely to find anything fixable? I can manually
nudge the disc into the “cold only” position and leave it there,
sort of defeats the purpose…
Doug
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