What's new
Van's Air Force

Don't miss anything! Register now for full access to the definitive RV support community.

Draining preservative oil from IO-540 - when to refill?

sritchie

Well Known Member
Hey all,

I've just finished mounting my new Lycoming IO-540 engine (from Van's) and am looking to install my EFII throttle body.

There's currently a plastic square bolted loosely over the bottom of the sump where the throttle body is supposed to mount. When I remove that, preservative oil starts to ooze out.

Is this fine? I guess this air inlet isn't supposed to have oil in it eventually... should I just let it drain out and then install the throttle body, or should I go through the full preservative oil removal process at this stage?

If the latter is the correct answer, once I drain the preservative oil, should I go ahead and add engine oil (SAE 20W-50, for example) now, or should I wait?

Thanks all... I'm trying to absorb all I can from the lycoming manual and the forums but it is definitely confusing at times.
 
Back
Top