Oil overflow

Update:

Oil seems like new oil and doesn't smell gas.

Finally, the engine lose prime after 1 mount without start...

Without compressor, all oil tank hoses connected and oil cap installed, I rotate the propeller 20 turn manually. Oil return to normal level. I started the engine for 1 minute and oil stay at the good level.

Normal?

Thanks!

Tommy St-Amour wrote:

Update:

Oil seems like new oil and doesn't smell gas.

Finally, the engine lose prime after 1 mount without start...

Without compressor, all oil tank hoses connected and oil cap installed, I rotate the propeller 20 turn manually. Oil return to normal level. I started the engine for 1 minute and oil stay at the good level.

Normal?

Thanks!

Yes. Each nine can have a slightly different personality. This depends on many things during the installation and even then two identical planes can be different.

i.e… One may turn the prop 3-4 times and get a gurgle and the other 20 times. The one with 20 times just has more oil in the bottom of the case.

Just to be sure...

That what i'm not sure, is why when I do the gurgle the oil is overflow when the engine not start after 1 month? So I put the oil stick back in the tank and closed the cap. I turned the propeller 20 times. Open the cap and check my oil and it's ok. Gurgle and after the engine start, oil is ok.

With the time the engine lose prime?

Thanks again!

I suspect your oil tank is positioned such that some oil drains from the sump, and maybe even the oil cooler, back into the oil tank when the plane sits unused.  When you burp the engine two different things are happening. First, compressed gasses push past the cylinders and into the engine case, and that pressure pushes oil in the engine sump to the oil tank.  Second, you are also turning the oil pump, which takes a bit longer to get fluid moving because the pump is not doing much at hand crank speed.  However, after your initial burp, all the oil is evacuated from the sump so the oil pump has a chance to catch up (next 20 turns you describe) and move oil into parts of the system that had drained during storage.  Then your next burp is normal.  Can you raise your oil tank just a bit and stay within spec?  It would probably only take an inch or two and it would no longer overflow.  

Yes, I will try that.

Thanks!