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Pete Fowler
Joined: 07 Jul 2009
Posts: 76
Location: California
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 Posted: Tue Apr 12, 2011 3:21 pm Post subject: Fine bubbles in oil? |
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Got a cylinder overhauled and did an oil change as part of that work and in the hour or so I've run it (flown it), the oil in the tank is full of fine bubbles to the extent you could call it "frothy". When I come back next morning, they're all gone and there's no milky substance so it doesn't look like fluid or water got in the oil but I'm concerned about "frothy" oil.
My oil tank vents to the upper intake tube connection. As a precaution, I took that all apart and cleaned it but still see bubbles in the oil when I run the engine.
Oil pressure is normal, no abnormal running symptoms. I'm considering draining all that new oil and re-filling but am otherwise stumped.
A secondary issue is that the upper breather tube seems to be venting some oil.
This is Aeroshell 120, everything is as I'm used to running it. The system has a new oil filter and the screens were all cleaned and the gaskets replaced in all oil drains. There is a chance of some moisture infiltrating the engine during the time the cylinder was off since, though it was carefully covered in plastic, it was no hermetically sealed.
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cjpilot710(at)aol.com
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| Posted: Wed Apr 13, 2011 4:02 am Post subject: Fine bubbles in oil? |
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Pete,
I think you're a little over concerned about the amount of water you may have gotten in you engine. Unless you left it out side, totally uncovered, they just will not collect much water just from condensation.
Also "frothy"? To what degree? There is always some frothy in the oil. It could very well be that the rings in that overhauled cylinder have not set yet and blow by is frothing your oil. That might explain the venting at the upper breather tube too. On my CJ I have that breather tube vented back to the oil tank and use the oil tank vent. Also I have an intake tube though the 1/9 baffle that takes in air to that same vent neck than to the oil tank.
But I am not an expert - just a pilot.
Jim "Pappy" Goolsby
In a message dated 4/12/2011 7:25:19 P.M. Eastern Daylight Time, pfdesign1(at)cox.net writes:
| Quote: | --> Yak-List message posted by: "Pete Fowler" <pfdesign1(at)cox.net>
Got a cylinder overhauled and did an oil change as part of that work and in the hour or so I've run it (flown it), the oil in the tank is full of fine bubbles to the extent you could call it "frothy". When I come back next morning, they're all gone and there's no milky substance so it doesn't look like fluid or water got in the oil but I'm concerned about "frothy" oil.
My oil tank vents to the upper intake tube connection. As a precaution, I took that all apart and cleaned it but still see bubbles in the oil when I run the engine.
Oil pressure is normal, no abnormal running symptoms. I'm considering draining all that new oil and re-filling but am otherwise stumped.
A secondary issue is that the upper breather tube seems to be venting some oil.
This is Aeroshell 120, everything is as I'm used to running it. The system has a new oil filter and the screens were all cleaned and the gaskets replaced in all oil drains. There is a chance of some moisture infiltrating the engine during the time the cylinder was off since, though it was carefully covered in plastic, it was no hermetically sealed.
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http://forums.matronics.com/viewtopic.php?p=336754#336754===============================================
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Pete Fowler
Joined: 07 Jul 2009
Posts: 76
Location: California
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| Posted: Tue Apr 19, 2011 7:01 am Post subject: Re: Fine bubbles in oil? |
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Looks like this was caused by blow-by from the freshly honed cylinder breaking-in. It's diminishing as I fly it more and the oil pressure is always good.
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