0360-A1D Carb question

[Tcraft938]

 The back of my carburetor box behind where the muffler heated air enters, there is a tube with a butterfly that is safety wired open.  I'm curious if there is to be a control to the butterfly arm so it could be variable?  Should it permanently be open like this or does it vary by season?  I attached a picture where the safety wire goes diagonally across the opening.  I've been looking through the service manual, but not coming up with anything.  Thank you very much for the help, an A&P suggested I reach out to the group.

[Boilermonkey]

That's part of the carb heat system. It should open and close with the carb heat control.

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[Skates97]

When the carb heat is off it is open. When using carb heat it is closed. Great reference article. 

http://donmaxwell.com/proper-operations-and-care-of-carburetor-heat-systems-on-m20-b-c-and-g-model-mooneys/

[MIm20c]

To answer your question it should be variable. The diagonal safety wire does not bother me but it appears (partially blocked by the hose) to attach to the control arm holding it open. If that is the case you would not be able to use carb heat to remove the ice if necessary. A closer look is recommended and IMO your A&P should have a better handle on what’s going on here. 

[Tcraft938]

32 minutes ago, Skates97 said:

When the carb heat is off it is open. When using carb heat it is closed. Great reference article. 

http://donmaxwell.com/proper-operations-and-care-of-carburetor-heat-systems-on-m20-b-c-and-g-model-mooneys/

Thank you very much!!!  Great article

[Tcraft938]

26 minutes ago, MIm20c said:

To answer your question it should be variable. The diagonal safety wire does not bother me but it appears (partially blocked by the hose) to attach to the control arm holding it open. If that is the case you would not be able to use carb heat to remove the ice if necessary. A closer look is recommended and IMO your A&P should have a better handle on what’s going on here. 

The local AP is very well versed and commented on it not being right. Since the last annual was at a mooney service center, I questioned him, and thus he suggested I inquire here. Probably to get me off his back.  Lol

[MIm20c]

8 minutes ago, Tcraft938 said:

The local AP is very well versed and commented on it not being right. Since the last annual was at a mooney service center, I questioned him, and thus he suggested I inquire here. Probably to get me off his back.  Lol

Makes a lot more sense. Sounds like you’ve found a good mechanic, treat him well as they are not easy to find. 

[BigD]

Great article!


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[Andy95W]

1 hour ago, MIm20c said:

Makes a lot more sense. Sounds like you’ve found a good mechanic, treat him well as they are not easy to find. 

⬆️⬆️⬆️

+1

[cliffy]

Heres a picture of what it looks like

The bend in the small wire connector puts both bell cranks in the same plane for actuation

With carb heat on the small hole is closed. With carb heat cold (off) the small valve is open allowing hot air around the muffler a way out so that the muffler doen;t get too hot

If it doesn't work correctly you don't get good carb heat   That's not good.  

 

Edited August 25, 2019 by cliffy

[carusoam]

There are two valves being opened and closed... as Cliffy’s pic shows....

One closes the filtered cold air inlet.... as it blocks heated air from escaping...

Under normal operating conditions... filtered air goes to the carb.   Heated air from the muff exits out into the lower cowling unless a hose gets placed on there... which is probably a good idea. As pictured in the past....

 

If you can... give a hint of which MSC is unaware of how the carb heat system works... NJ Jim has pointed one out already.  Is there another?

Best regards,

-a-