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tigeryak18t
Joined: 26 Sep 2009
Posts: 233
Location: PARIS FRANCE
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 Posted: Mon May 17, 2010 7:32 am Post subject: Again : Oil miracle |
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Good day to all,
I have a question regarding a strange behavior on a YAK52.
During my preflight check, I had a look on the oil stick. It shows about 5 liters left.....danger zone. How could this happen.
So I filled the oil with 5 more liters up to ten.
Then I started the motor and had a look after 15mn run. The stick shows 16 liters. This time too much.
So I purge 6 liters.
The time after I had the same phenomenon again. When the motor has not run the oil is very low but after a few mn it comes back to normal.
This is sort of a problem because I can't check the oil anymore. When will I know if the oil is low for real.
Does this have happen to one of you???? Is this a known issue and is there there any solution?
Now another question regarding the Heading Indicator on a Yak18T. Last week I was flying and I looked at my HI. It shows about 150 to 180 degres opposite of the real heading. (GPS heading!!!)
I touched some buttons on the control panel (left hand side) I don't know which one was the good one but after a moment, it comes back to normal.
Is there anyone out there having the modus operandi (sorry....the manual!!!) of this HI please.
Sorry about the noise on the list and thanks to all
have a good flying day
kind regards
--
Didier BLOUZARD
didier.blouzard(at)gmail.com (didier.blouzard(at)gmail.com)
0624243672
[quote][b]
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_________________
Didier Tiger YAK18T
Member of Commemorative Air Force
French Wing |
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dsavarese0812(at)bellsout
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| Posted: Mon May 17, 2010 7:44 am Post subject: Again : Oil miracle |
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The problem is internal to the oil pump. There is a valve inside the oil pump that is remaining open which permits the oil in the tank to drain in through the oil pump into the engine. Jill Gernetzke did an excellent article on this problem in the RPA magazine a few months back. Most of the oil will be in the engine sump. When you start the engine, the scavenge pump side of the oil pump (the output side) pushes the oil back through the oil cooler and then into the oil tank. The oil in the tank does not have enough time to drain back down when you shut the engine down and immediately check the oil. That's why you see the higher oil level on the dip stick after you run the engine.
Dennis
[quote] ---
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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tigeryak18t
Joined: 26 Sep 2009
Posts: 233
Location: PARIS FRANCE
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| Posted: Mon May 17, 2010 8:08 am Post subject: Again : Oil miracle |
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Thanks Denniss,
do you think it is possible to have an electronic copy of this article..???
Thanks very much
Didier
2010/5/17 A. Dennis Savarese <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)>
[quote] The problem is internal to the oil pump. There is a valve inside the oil pump that is remaining open which permits the oil in the tank to drain in through the oil pump into the engine. Jill Gernetzke did an excellent article on this problem in the RPA magazine a few months back. Most of the oil will be in the engine sump. When you start the engine, the scavenge pump side of the oil pump (the output side) pushes the oil back through the oil cooler and then into the oil tank. The oil in the tank does not have enough time to drain back down when you shut the engine down and immediately check the oil. That's why you see the higher oil level on the dip stick after you run the engine.
Dennis
[quote] ---
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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_________________
Didier Tiger YAK18T
Member of Commemorative Air Force
French Wing |
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wlannon(at)persona.ca
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| Posted: Mon May 17, 2010 8:29 am Post subject: Again : Oil miracle |
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All dry sump aircraft engines utilize a scavange pump to return oil to the tank.
After landing and taxi in at idle RPM the scavange pump output is low and oil accumulates in the sump.
There is a standard operating procedure for these engines that requires a ground run prior to shut-down for a specific length of time at a specific RPM.
For a typical small radial I would suggest 1500 RPM for 1 minute.
Do this the same every time and you will get a reliable oil level reading in the tank.
Walt
[quote] ---
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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dsavarese0812(at)bellsout
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viperdoc(at)mindspring.co
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| Posted: Mon May 17, 2010 7:33 pm Post subject: Again : Oil miracle |
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Walt according to the original translated YAK-52 pilot’s manual, the procedure is to sump the engine at 70% (~1600 RPM) for 30 sec. Pretty close.
Doc
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Walter Lannon
Sent: Monday, May 17, 2010 11:26 AM
To: yak-list(at)matronics.com
Subject: Re: Again : Oil miracle
All dry sump aircraft engines utilize a scavange pump to return oil to the tank.
After landing and taxi in at idle RPM the scavange pump output is low and oil accumulates in the sump.
There is a standard operating procedure for these engines that requires a ground run prior to shut-down for a specific length of time at a specific RPM.
For a typical small radial I would suggest 1500 RPM for 1 minute.
Do this the same every time and you will get a reliable oil level reading in the tank.
Walt
[quote]
----- Original Message -----
From: Didier Blouzard (didier.blouzard(at)gmail.com)
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Sent: Monday, May 17, 2010 8:32 AM
Subject: Again : Oil miracle
Good day to all,
I have a question regarding a strange behavior on a YAK52.
During my preflight check, I had a look on the oil stick. It shows about 5 liters left.....danger zone. How could this happen.
So I filled the oil with 5 more liters up to ten.
Then I started the motor and had a look after 15mn run. The stick shows 16 liters. This time too much.
So I purge 6 liters.
The time after I had the same phenomenon again. When the motor has not run the oil is very low but after a few mn it comes back to normal.
This is sort of a problem because I can't check the oil anymore. When will I know if the oil is low for real.
Does this have happen to one of you???? Is this a known issue and is there there any solution?
Now another question regarding the Heading Indicator on a Yak18T. Last week I was flying and I looked at my HI. It shows about 150 to 180 degres opposite of the real heading. (GPS heading!!!)
I touched some buttons on the control panel (left hand side) I don't know which one was the good one but after a moment, it comes back to normal.
Is there anyone out there having the modus operandi (sorry....the manual!!!) of this HI please.
Sorry about the noise on the list and thanks to all
have a good flying day
kind regards
--
Didier BLOUZARD
didier.blouzard(at)gmail.com (didier.blouzard(at)gmail.com)
0624243672 [b]
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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wlannon(at)persona.ca
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| Posted: Mon May 17, 2010 8:11 pm Post subject: Again : Oil miracle |
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OK. Just do exactly the same every time.
Walt
[quote] ---
| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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viperdoc(at)mindspring.co
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| Posted: Tue May 18, 2010 4:29 am Post subject: Again : Oil miracle |
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Roger…I do.
Doc
From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Walter Lannon
Sent: Monday, May 17, 2010 11:12 PM
To: yak-list(at)matronics.com
Subject: Re: Again : Oil miracle
OK. Just do exactly the same every time.
Walt
[quote]
----- Original Message -----
From: Roger Kemp M.D. (viperdoc(at)mindspring.com)
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Sent: Monday, May 17, 2010 8:33 PM
Subject: RE: Again : Oil miracle
Walt according to the original translated YAK-52 pilot’s manual, the procedure is to sump the engine at 70% (~1600 RPM) for 30 sec. Pretty close.
Doc
From: owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Walter Lannon
Sent: Monday, May 17, 2010 11:26 AM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: Re: Again : Oil miracle
All dry sump aircraft engines utilize a scavange pump to return oil to the tank.
After landing and taxi in at idle RPM the scavange pump output is low and oil accumulates in the sump.
There is a standard operating procedure for these engines that requires a ground run prior to shut-down for a specific length of time at a specific RPM.
For a typical small radial I would suggest 1500 RPM for 1 minute.
Do this the same every time and you will get a reliable oil level reading in the tank.
Walt
| Quote: |
----- Original Message -----
From: Didier Blouzard (didier.blouzard(at)gmail.com)
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Sent: Monday, May 17, 2010 8:32 AM
Subject: Again : Oil miracle
Good day to all,
I have a question regarding a strange behavior on a YAK52.
During my preflight check, I had a look on the oil stick. It shows about 5 liters left.....danger zone. How could this happen.
So I filled the oil with 5 more liters up to ten.
Then I started the motor and had a look after 15mn run. The stick shows 16 liters. This time too much.
So I purge 6 liters.
The time after I had the same phenomenon again. When the motor has not run the oil is very low but after a few mn it comes back to normal.
This is sort of a problem because I can't check the oil anymore. When will I know if the oil is low for real.
Does this have happen to one of you???? Is this a known issue and is there there any solution?
Now another question regarding the Heading Indicator on a Yak18T. Last week I was flying and I looked at my HI. It shows about 150 to 180 degres opposite of the real heading. (GPS heading!!!)
I touched some buttons on the control panel (left hand side) I don't know which one was the good one but after a moment, it comes back to normal.
Is there anyone out there having the modus operandi (sorry....the manual!!!) of this HI please.
Sorry about the noise on the list and thanks to all
have a good flying day
kind regards
--
Didier BLOUZARD
didier.blouzard(at)gmail.com (didier.blouzard(at)gmail.com)
0624243672 href="http://www.matronics.com/Navigator?Yak-List">http://www.matronics.com/Navigator?Yak-Listhref="http://forums.matronics.com">http://forums.matronics.comhref="http://www.matronics.com/contribution">http://www.matronics.com/c |
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| | - The Matronics Yak-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Yak-List |
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