Engine port confusion

[KinzuaBearhawk]

Can someone please explain what the three red plastic ports are designed for on this simple Lycoming o-360 carbureted engine with p-mags. I am getting conflicting information. Just looking to hookup oil cooler. Any advice is greatly appreciated.

 

[DBeaulieu]

Disclaimer - Check with Lycoming, but I think... the capped fitting facing aft is the oil cooler out (back to the engine) and oil to the cooler is a fitting that should be located low underneath the right side PMAG and slightly more inboard. The other capped fitting was used for a viscosity valve for engines without spin on oil filters. Both serve as oil from cooler to the engine paths. One will be capped with big plug...your choice. Seems like you have a fitting in place on one of those? Please check with Lycoming or your favorite engine guru and let us all know!

 

[jaredyates]

Here’s how I would do it. You are missing some fittings. I would use steel fittings, and seal the pipe threads with Loctite 565 or whatever sealant you prefer instead. No goo on the 37 degree flares which will be male on the fitting and female on your firesleeved hoses. If you are not going to use the mechanical tachometer, you can buy a nice cover for that port, which has provisions for safety wire.