66’ M20e EDM 730 install

[Nukemzzz]

Sharing some details of the EMD install in case it is useful to others. 
 

Original Panel.  Note the ancient transponder with a mode A and C switch above it. Also the EGT With the 4 position switch in the lower right is inop which is why I decided to install the JPI while the exhaust was out for rebuild. 
 

Space behind the right panel is taken over by the big transponder box. It’s gotta go and the EDM fits in the same size hole. 
 

Someone replaced the glove box with some some useful but oddly placed things. Decided to leave them there for now and I’ll rearrange everything at a later date with a full new panel plate. 
 

Might need to re weigh and balance the plane after removing this. Anyone need a vintage transponder?  Makes a nice paperweight. 
 

Shot of the wire routing out of two firewall bushings. Right bank out of the lower. Left bank out of the upper. 
 

Shot of the routing. I wanted the EGT inboard so it was cleaner and it could be routed with CHT. Holes are 4” below the exhaust flange. So much time thinking about, and measuring, and double checking this because the new drop tubes weren’t cheap. Lol

 

Near final right bank routing. It all came together nicely. 

The short fire sleeve is part of the kit for retaining the original primary CHT.  JPI sensor is a washer thermocouple that goes below the CHT bushing.  This cylinder will read a little cooler as a result I think.  I’m not sure why they have you put the fire sleeve around it.  

Left bank routing. Again it worked well inboard.  Note the newly installed ez-heater. Did it with the exhaust out as well. In this shot you can also see the white fuel flow transducer wires bundled and secured for a later install of the included transducer. 
 

Final install panel shot  It’s not pretty but functional. Hopefully I’ll be able to read it from the pilot seat.  Note the press to test engine warning light installed just to the left of the LCD screen.  To add this you need to put a pin and wire in the the fuel flow serial plug at pin 11.  I didn’t want to mess with the left panel at this time so opted to put it by the instrument itself so it’s obvious what is is for  

Getting at the screw that tightens the clamp around the gage is tricky.  Because it has to be done with everything put back in place in my case. Be sure to orient the mount so you can get to it  

Fuel transducer wires are routed and secured out of a third bushing, but the transducer isn’t yet installed  I’m holding on that until a later date as I need to get this bird back in the air now.  I’ll try and add another picture of that soon.

 

[carusoam]

Expect that the short fire-sleeve may act as an insulator to keep the extra CHT sensor from getting cooled by airflow past the cylinders... (?)

Just a PP guessing, not a mechanic...

Best regards,

-a-