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Bill & Brendas RV-8 QB
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Date:  4-19-2014
Number of Hours:  2.00
Manual Reference:  
Brief Description:  Fix OAT probe wiring and install nd probe

I traced the OAT probe wire back from my GT-50 multi function instrument to where it split off from the Dynon EMS. I was using the Dynon OAT probe to run two instruments temperature readings. This, Idiscovered, does not work. After cutting of the wire at the T junction for a run to GT50, The Dynon EMS was showing an accurate temp reading.
The plans for the new GT50 temp probe say to use a single conductor shielded wire. I decided to try regular 22AWG wire instead. If I get noise, Ill pull it out and wire in shielded later.
I spliced in the wire to the GT50s green temp probe wire and ran down inside gear tower and then thru to aft with large wire bundle. Had to fish it thru with some safety wire. I had it exit with the wing lights wiring and then tagged. Ill make the final connection to probe after wing install

I decided to install this 2nd probe in a wing inspection cover and just outside the arc of the propeller. That is the 2nd inspection cover outboard from the wing root. I decided to drill the mounting hole in the edge of the inspection cover and thru the goggle in the wing skin where the cover rests on a flange. The idea is to be able to remove the cover and not the probe or wiring.

Drilled 1/8 hole thru the cover and flange for the probe and deburred

Crimped on a ring terminal to one probe wire and secured it to the adjacent wing rib with #8 screw and nylock washer. This was tough as there isnt any room for my hand and so I had to remove a third cover and use extenion on screwdriver attachment to hold screw in place and tighten down the nut. This semed so easy and quick but took an hour!

With the cover off, I glued in the probe with amazing goop, I also found a nylon spacer with a 1/8 hole to put on the back side and add some support to the probe and extra area for adheison.

When the wing is on, Ill just crimp the other wire to the wire I ran to the wing root for this.

I also installed two dual ignition wire clamps to the engine. I purchased these from ACS and they hold two wires nicely
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Dynon probe works. Temp close to carb temp probe

Dynon probe works. Temp close to carb temp probe

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Tested new probe for GT50 and it works. Bit higher reading however

Tested new probe for GT50 and it works. Bit higher reading however

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Probe glued in to inspection cover joggle and grounded. The probe was pushed down some to be straight

Probe glued in to inspection cover joggle and grounded. The probe was pushed down some to be straight

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