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I can't burp the oil tank on my 912 UL. Could use some help

 
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rlborger(at)mac.com
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PostPosted: Mon Nov 22, 2010 8:40 am    Post subject: I can't burp the oil tank on my 912 UL. Could use some help Reply with quote

Geoff,

In my Europa installation the oil reservoir has to be mounted slightly higher than the 914's crankcase. Because of this, some oil works its way back into the crankcase over time. The more oil in the crankcase, the more revs needed to blow it out. I generally find that the oil level before burp is down almost 1/2 quart (~1/2 liter) before I do the burp. In my case it may take 15 or 20 revolutions of the prop to blow all the oil from the crankcase and get a satisfying burp. After burp, it is back to close to the full level. Remember, you are using piston blow-by to pressure the crank case and push out the oil. There isn't a whole lot of blow by volume from one compression stroke so it's going to take a fair number of compressions to get sufficient pressure/volume to displace the oil. Don't give up, just keep flipping blades and you'll get your burp.

Check six,
Bob Borger
Europa Kit #A221 N914XL, XS Tri-Gear, Intercooled 914, Airmaster C/S Prop
http://www.europaowners.org/forums/gallery2.php?g2_itemId=60232
http://www.biplaneforumgallery.com/index.php?cat=10046
Europa Flying!
3705 Lynchburg Dr.
Corinth, TX 76208
Home: 940-497-2123
Cel: 817-992-1117

On Nov 22, 2010, at 8:19, Geoff Heap wrote:

Quote:


Hey guys.
I'm not flying yet, in fact I have not started the engine yet (912 UL). I've been neglecting it and concentrating on the building. Now I find that I cannot 'burp' the oil tank . The oil level in the tank has been real low but I know that it was high at one time because I'm the one that filled it. I know it just ran down into the crankcase. So I hand propped it again no end of times. No 'burp' and the oil level would not come up. So I broke the connection under the engine and ran all the oil down into a clean plastic coffee can. I got slightly over half a can, about a quart. I re connected the crankcase plug and poured the retrieved oil into the tank. Dip the tank and it’s at FULL level. I let it sit for 2 days and then Hand propped it over 10 full revolutions. Still nothing. During the 2 days, some of the oil should have leaked into the crankcase. Have I got an airlock somewhere that’s preventing the oil from pumping back to the tank? I'd appreciate some advice……Geoff

--------
Dual controls. Dynon 180. Icom 210 Garmin 296. Becker transponder. Sigtronics intercom. Electric flaperons.


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