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M20F Sacramento area

Luci

By Luci
in Vintage Mooneys (pre-J models)

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Luci Apprentice

Luci

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Posted

Purchased a “new to me” 67 F, looking for help with starter switch issues in Sacramento area. Also gear horn wouldn’t shut up!

Shadrach Grand Master

Shadrach

Posted
Posted
46 minutes ago, Luci said:

Purchased a “new to me” 67 F, looking for help with starter switch issues in Sacramento area. Also gear horn wouldn’t shut up!

More specifics.  Please describe the issues with each component. Do you have manual or electric gear?

Luci Apprentice

Luci

Posted
  • Author
Posted

Manual gear. 
When I crank the engine (it’s a twist and push to start switch), if I push all the way it stops from cranking, so I have to release de pressure a bit. (I think I need a new switch; took it out, re-tension the springs, cleans the triangular contacts, and still not working to my liking). And once the master switch is on, gear horn starts screaming. Wouldn’t shut up even at engine runup.

 

Yetti Grand Master

Yetti

Posted
Posted

There are plates to rebuild the switch.   The stall horn may be bumped, or wet.  Spray with contact cleaner.   to Search mooneyspace   Put mooneyspace and the subject in Google.   Leave the .com off or it will go to the site.

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Shiny moose Proficient

Shiny moose

Posted
Posted

 Do you have the correct switch? does it still have the shower of sparks, turn key and listen for it, you should hear it , push in key to turn starter, dont forget the small metal jumper on the switch to ground out mag during start

 

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Shadrach Grand Master

Shadrach

Posted
Posted (edited)
3 hours ago, Luci said:

Manual gear. 
When I crank the engine (it’s a twist and push to start switch), if I push all the way it stops from cranking, so I have to release de pressure a bit. (I think I need a new switch; took it out, re-tension the springs, cleans the triangular contacts, and still not working to my liking). And once the master switch is on, gear horn starts screaming. Wouldn’t shut up even at engine runup.

 

Gear horn has two components, a microswitch behind the Jbar downlock and a throttle position switch that should be set to should be binary in function. If the horn silences on takeoff it’s because the throttle position switch opens the circuit above ~12” of mp (if properly set). This is an easy system to trouble shoot but not so easy to access.

Edited by Shadrach
Luci Apprentice

Luci

Posted
  • Author
Posted
4 hours ago, M20F-1968 said:
4 hours ago, M20F-1968 said:

Post some pictures of your new bird so we can see what you have.  Without pics it didn't happen.

John Breda

 

 

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carusoam Grand Master

carusoam

Posted
Posted

Welcome aboard Luci!

 

Looks like I’m too late to add anything but welcome aboard…

1) Bendix switches do get old after about 50 years…

2) They are completely rebuildable …. Buy the kit…

3) Remember how important the switch is for keeping your engine running….  Don’t wait to see what else can wear off of it…

4) Take pics of the wires on the back… and any jumpers you see…. Everything has to go back the same way when your mechanic is done with it…

5) New switches are available from Aircraft Spruce…

6) There are even some newer style push to start types that are getting used lately… keyless…

7) My M20C’s push to start part of the ignition switch stopped working the day I sold my plane… it was a bit dodgy before… but completely unable the day the new owner showed up…

 

 

8) Gear horn has two switches to make it sound… throttle out, and gear up…. One switch is on the throttle push rod… the other up in the down lock block….

9) Not mentioned yet…. The Mallory sound producing devices sometimes get a short wire down stream of the horn….  The horn is always powered, the other two switches supply the ground….

10) sounds like it could be a short in a wire above the ceiling panel….

 

PP thoughts only, not a mechanic….

Best regards,

-a-

Luci Apprentice

Luci

Posted
  • Author
Posted
12 minutes ago, carusoam said:

 

12 minutes ago, carusoam said:

Welcome aboard Luci!

 

Looks like I’m too late to add anything but welcome aboard…

1) Bendix switches do get old after about 50 years…

2) They are completely rebuildable …. Buy the kit…

3) Remember how important the switch is for keeping your engine running….  Don’t wait to see what else can wear off of it…

4) Take pics of the wires on the back… and any jumpers you see…. Everything has to go back the same way when your mechanic is done with it…

5) New switches are available from Aircraft Spruce…

6) There are even some newer style push to start types that are getting used lately… keyless…

7) My M20C’s push to start part of the ignition switch stopped working the day I sold my plane… it was a bit dodgy before… but completely unable the day the new owner showed up…

 

 

8) Gear horn has two switches to make it sound… throttle out, and gear up…. One switch is on the throttle push rod… the other up in the down lock block….

9) Not mentioned yet…. The Mallory sound producing devices sometimes get a short wire down stream of the horn….  The horn is always powered, the other two switches supply the ground….

10) sounds like it could be a short in a wire above the ceiling panel….

 

PP thoughts only, not a mechanic….

Best regards,

-a-

Regarding the keyless push to start switch, can you point me toward one it can be installed in my F, please?

Thank you for the kind advice.

I’m still waiting on the Canadian Aircraft Registry to de register the aircraft, so I’m trying to get it ready f

47U Mentor

47U

Posted
Posted

It was mentioned a few posts up, at the very end…

On 8/21/2021 at 9:13 PM, Luci said:

I’m still waiting on the Canadian Aircraft Registry to de register the aircraft,

 

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