Today's Message Index:
----------------------
1. 09:50 AM - Re: precautionary landing mystery (Walter Lannon)
2. 04:27 PM - Re: precautionary landing mystery (Bill Geipel)
3. 07:10 PM - precautionary landing mystery, chapter 2 (Jon Boede)
Message 1
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| Subject: | Re: precautionary landing mystery |
Jon;
Foamy oil is excess air being sucked in somewhere. More than likely a
leaking oil-in gasket, hose or fitting.
Walt
From: Jon Boede
Sent: Sunday, March 24, 2013 6:14 PM
Subject: Yak-List: precautionary landing mystery
So I'm flying along 30 minutes into a flight on a nice sunny day (about
15C outside, altitude about 3,000') and I notice...
1. My oil inlet temperature is 40C
2. Now my inlet oil temp is 30C
3. My oil pressure isn't 5.5-6 anymore, it's about 5
4. And then my inlet oil temp is 20C and my oil pressure is about 4.5,
outlet temp is 55C
5. My port wing is sloppy wet, although my starboard wing is "normal"
(i.e. needs to a good bath like usual but not much more than that)
I'm talking to Waco Approach since I'm transiting their Class D and it
occurs to me that since their perfectly good airport is about 3 miles
away, I might avoid getting the "idiot of the month" award if I make a
precautionary landing instead of flying another half hour to my
destination.
That all goes well and at the FBO my first question is "How much oil do
I have left?"
6. Oil level determination is not possible since the oil in the tank is
super foamy
7. No oil on the windshield, not much on the prop
8. Port side gear is sloppy wet, starboard side is reasonably clean ...
weird.
So I look it over really good and can't find an obvious broken anything,
call a friend to rescue me and get a crew car and go to lunch. I stop
by Home Depot to get a bag of towels (because, radial).
9. Engine compartment is not soaked, although there's plenty of oil on
the firewall but it doesn't look like any of the cylinders have lost
their base gaskets.
45 minutes later I come back and take some pictures. Oil level still
determinate since it's full of pinhead sized foam bubbles.
10. Foamy oil bubbles up to the top of dipstick (see pic)
Arrange with FBO to put up plane in a hangar for the next couple of days
that are supposed to be wet and windy, rescue ride arrives. Depart.
Any guesses on this? I'm thinking that its my oil pump, but not sure
exactly what part (since I'm realizing that I don't know if the stock
285 hp engine's oil pump is two pumps or one)
Sigh,
Jon
Message 2
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| Subject: | Re: precautionary landing mystery |
I had an oil line that was so old it just became saturated with oil, like a s
ponge. It had a protective cover over it. When squeezed you could feel it. N
ever saw oil coming from it but is pooling at one end and blowing everywhere
.
For what it's worth.
Bill
On Mar 25, 2013, at 11:47 AM, "Walter Lannon" <wlannon@shaw.ca> wrote:
> Jon;
>
> Foamy oil is excess air being sucked in somewhere. More than likely a le
aking oil-in gasket, hose or fitting.
>
> Walt
>
> From: Jon Boede
> Sent: Sunday, March 24, 2013 6:14 PM
> To: yak-list@matronics.com
> Subject: Yak-List: precautionary landing mystery
>
> So I'm flying along 30 minutes into a flight on a nice sunny day (about 15
C outside, altitude about 3,000') and I notice...
>
> 1. My oil inlet temperature is 40C
> 2. Now my inlet oil temp is 30C
> 3. My oil pressure isn't 5.5-6 anymore, it's about 5
> 4. And then my inlet oil temp is 20C and my oil pressure is about 4.5, out
let temp is 55C
> 5. My port wing is sloppy wet, although my starboard wing is "normal" (i.e
. needs to a good bath like usual but not much more than that)
>
> I'm talking to Waco Approach since I'm transiting their Class D and it occ
urs to me that since their perfectly good airport is about 3 miles away, I m
ight avoid getting the "idiot of the month" award if I make a precautionary l
anding instead of flying another half hour to my destination.
>
> That all goes well and at the FBO my first question is "How much oil do I h
ave left?"
>
> 6. Oil level determination is not possible since the oil in the tank is su
per foamy
> 7. No oil on the windshield, not much on the prop
> 8. Port side gear is sloppy wet, starboard side is reasonably clean ... we
ird.
>
> So I look it over really good and can't find an obvious broken anything, c
all a friend to rescue me and get a crew car and go to lunch. I stop by Hom
e Depot to get a bag of towels (because, radial).
>
> 9. Engine compartment is not soaked, although there's plenty of oil on the
firewall but it doesn't look like any of the cylinders have lost their base
gaskets.
>
> 45 minutes later I come back and take some pictures. Oil level still dete
rminate since it's full of pinhead sized foam bubbles.
>
> 10. Foamy oil bubbles up to the top of dipstick (see pic)
>
> Arrange with FBO to put up plane in a hangar for the next couple of days t
hat are supposed to be wet and windy, rescue ride arrives. Depart.
>
> Any guesses on this? I'm thinking that its my oil pump, but not sure exac
tly what part (since I'm realizing that I don't know if the stock 285 hp eng
ine's oil pump is two pumps or one)
>
> Sigh,
> Jon
>
>
>
>
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Message 3
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| Subject: | precautionary landing mystery, chapter 2 |
I called down to the FBO and had one of their mechanics check the oil level
now now that the foam has settled.
He said the foam was gone and the oil level was all the way to the top hole
!
Sunday morning I was at about 13 liters. I added a liter from one bottle a
nd since I like about 16 to fly with on a short trip I put some more in fro
m a 2.5 gallon jug. The jug isn't easy to start and I most likely got it a
little over-filled. I don't like to go past 17. Perhaps I got it to 18 o
r even a little more. I figured that in a 2.5 hour round trip it would use
a liter anyway and if it overboarded some=2C well=2C I get what I deserved
.
It had been about 3 weeks since the plane was last flown. Oil at that time
was about 16 before the flight. It seemed like the drip buckets were more
full=2C but since it's been 3 weeks my memory is a bit foggy. When it dro
ps like that I'm always extra careful pulling it through since my assumptio
n is that the missing oil is filling up the bottom cylinders not sitting in
the drip pan. There was some discharge from pulling the prop through but
nothing major. Still=2C there could have been more than just a little oil
in the scavenge portion of the engine and that'd put me way over 18 liters.
So the question is=2C if you over-fill your oil tank=2C would that cause fo
aming? Maybe yes? I've never done it before=2C so I don't know.
Current theories are:
1. Crack or hose leak on the "suck" side of the pump=2C introducing air int
o the system.
2. Maybe overfilling the oil tank caused a problem.
3. Vent line from tank is blocked and tank is pressurizing.
4. Some problem with the other tube that ventilates the case.
5. Blown supercharger seal causing pressurizing (I hope it's not this one).
Approach to breaking the problem down...
1. Inspect tank ventilation line to see if some creature has made a home in
it or other blockage.
2. Run up airplane with cowl off to see if something unusual is happening.
3. Drain a couple of liters from system=2C down to 15 or 16 and run/fly air
plane to see if problem repeats.
4. Replace hoses from tank to screen (no aftermarket filter installed on th
is plane) and from screen to tank.
5. Thoroughly inspect everything from tank to pump to see if there are any
cracks or problems.
Other suggestions? Debugging this from remote is an interesting exercise.
Thanks!!
Jon
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