[N184JG]

I have an ECI kit engine IO-360 with hollow crank .On first flight I started getting oil on the windshield so I landed and lost 4 qts of oil in 2 min. I found the crank plug turned 90 deg in the crank, replaced with a new one. With 5 hrs on the engine while doing a run up I blew the plug again. Things that I know oil pressure max 70 psi ,plug installed correctly,very smooth running, crankcase breather open.Looking for answers.

 

[WingsOnWheels]

Is the rear crank plug punctured or the governor blockoff plate made to bypass?

 

[mikehoover]

You have a fixed-pitch prop?

Rear crank plug should to be removed or a hole (or two) punched in it. Might as well just remove it with a slide hammer.

Front crank plug installed (convex forward) and pounded in with a crank plug ram (rent from Lycoming) or heavy ball pean hammer positioned in the center of the plug and driven home by an 8 lb. sledge hammer.

(Lycoming told me all of this over the phone.)

Lycoming was adamant that I puncture or remove the rear plug in the crank and not rely on the venting of the prop governor cover plate.

 

[Bob Axsom]

Coincidence

We just covered the crankshaft in the Lycoming Service School today. You don't say it but the symptoms you describe are exactly what you would expect with a fixed pitch prop and both the front and rear plugs installed.

Bob Axsom

 

[N184JG]

Thanks for all the help I will check the rear plug on Sunday when I return from San Antonio. The rear plug was already installed in the crank and I did not put any holes in it.