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JohnF
Joined: 13 May 2010
Posts: 124
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 Posted: Wed Jul 07, 2010 12:58 am Post subject: No Burp |
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I lost my prop in a stall accident...not a lot of damage, but the prop is gone. I am still waiting for the FAA to look at things before starting repairs (the engine will be pulled to repair some firewall damage and the gear box sent out for a good checking) - I was going to drain fluids in the 912ULS but for no real reason pulled the stub of what's left of the prop to 'burp' the engine..it didn't burp. I had just purged the engine before the accident and there was 3 liters of oil added. There was no oil leak whatever due to the accident. I can see 25psi oil pressure after pulling the engine over perhaps 10 times or so and I know the pistons are going up and down, but no burp, and I only could get about 1 liter of oil from the reservoir. This concerns me and I am uncertain why I cannot 'burp' the engine....your take?
[quote][b]
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lucien
Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM
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| Posted: Wed Jul 07, 2010 4:50 am Post subject: Re: No Burp |
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[quote="JohnF"]I lost my prop in a stall accident...not a lot of damage, but the prop is gone. I am still waiting for the FAA to look at things before starting repairs (the engine will be pulled to repair some firewall damage and the gear box sent out for a good checking) - I was going to drain fluids in the 912ULS but for no real reason pulled the stub of what's left of the prop to 'burp' the engine..it didn't burp. I had just purged the engine before the accident and there was 3 liters of oil added. There was no oil leak whatever due to the accident. I can see 25psi oil pressure after pulling the engine over perhaps 10 times or so and I know the pistons are going up and down, but no burp, and I only could get about 1 liter of oil from the reservoir. This concerns me and I am uncertain why I cannot 'burp' the engine....your take?
Yeah that's bad  .
IMHO, tho, I personally wouldn't turn the motor over anymore until you've been able to determine there isn't any other damage inside the motor itself. I.e. measured the runout on the crank, checked for cracks etc. If there is damage there, turning it over even by hand could possibly make it worse by grinding damaged parts together and so on.
Don't ask me why I suggest this.
So I'd do that first, and then once you've determined it's safe to turn it over, troubleshoot the oil return. It could be a leak in the crankcase or a blockage of some kind in the oil return....
My .02,
LS
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LS
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rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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| Posted: Wed Jul 07, 2010 5:04 am Post subject: No Burp |
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John, Once the oil level is a liter or so down the engine will not burp. I learned this the hard way while showing a customer how to burp the engine before I did the oil change. It was down a liter and I couldn't get a burp to save my life. After the change I pulled the engine through and with the oil up to full it burped just fine. I amended my demonstration to include checking the oil level first. :-}
Rick Girard
On Wed, Jul 7, 2010 at 3:58 AM, John Fasching <n29cx(at)ridgeviewtel.us (n29cx(at)ridgeviewtel.us)> wrote:
[quote] I lost my prop in a stall accident...not a lot of damage, but the prop is gone. I am still waiting for the FAA to look at things before starting repairs (the engine will be pulled to repair some firewall damage and the gear box sent out for a good checking) - I was going to drain fluids in the 912ULS but for no real reason pulled the stub of what's left of the prop to 'burp' the engine..it didn't burp. I had just purged the engine before the accident and there was 3 liters of oil added. There was no oil leak whatever due to the accident. I can see 25psi oil pressure after pulling the engine over perhaps 10 times or so and I know the pistons are going up and down, but no burp, and I only could get about 1 liter of oil from the reservoir. This concerns me and I am uncertain why I cannot 'burp' the engine....your take?
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rholder(at)avnet.co.uk
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| Posted: Wed Jul 07, 2010 8:32 am Post subject: No Burp |
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John Fasching wrote:
| Quote: | I lost my prop in a stall accident...not a lot of damage, but the prop
is gone. I am still waiting for the FAA to look at things before
starting repairs (the engine will be pulled to repair some firewall
damage and the gear box sent out for a good checking) - I was going to
drain fluids in the 912ULS but for no real reason pulled the stub of
what's left of the prop to 'burp' the engine..it didn't burp. I had just
purged the engine before the accident and there was 3 liters of oil
added. There was no oil leak whatever due to the accident. I can see
25psi oil pressure after pulling the engine over perhaps 10 times or so
and I know the pistons are going up and down, but no burp, and I only
could get about 1 liter of oil from the reservoir. This concerns me and
I am uncertain why I cannot 'burp' the engine....your take?
|
If you have removed the gearbox the crankcase is now not
sealed and so there won't be any pressure available to
return oil to the oil tank !
Or ditto if you have removed a few plugs !
Or maybe I have the wrong end of the stick.
RH
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