This is a photo album of my RV - 4.

I will be putting notes and explanatory pictures as I build this air plane.

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Saturday, January 26, 2013

Steam Guages / Oil Pressure Port

This caused a fair bit of angst. 

By the time I had identified the oil pressure port I had already put the engine mounts/Lord Mounts / engine on the firewall. The oil pressure takeoff is in a bastard spot just under the top engine mount and it is seized.  You cant install an oil pressure fitting in that place without removing the engine anyway. You need a 45° fitting there and you can't install a 90° because of interference with the engine block. Heat from a blowtorch gently applied is the go for loosening the plug.  I used a butane torch till the paint scorched and smoked it took some  torque but cracked ok.

You then need to tap the port since the NPT taper thread will only do up a few turns. Finish with a non hardening Loctite 567 type sealer. 

Reinstalling the engine is a real chore unless you hang the engine from the block and tackle and put the fuselage straight and level. It will either fight like hell or go straight on. Be pateint and get the job lined up right.

37 degree / spherical insert ?

I have a Fuel and Oil Pressure Gauge. I want to plumb them using a 37 degree flared fitting. They have a concave seal in the back of the guage male fitting.

I was thinking about spinning up a male 37 degree / spherical brass insert and running a hole through the middle on my mates lathe but it seems extraordinary and fiddly operation.

Is there a better way of doing this ?

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