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javiercarrascob
Joined: 06 Sep 2009
Posts: 62
Location: Virginia
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 Posted: Wed Jun 16, 2021 10:18 am Post subject: Oil pump adjustment or troubleshooting |
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Hello everyone.
Quick question. My M-14p has an issue that my mechanic has not been able to figure out.
When the oil gets hot the oil pressure drops to zero when the throttle is closed or idle (around 30% rpm), this is only an issue after landing, cruise oil pressure is good and there is no loss of oil while flying for an hour straight and level.
We did find a screw that allow us to turn the oil pressure higher but seems to only work at RPMs over 40%.
Changing the oil to higher grade just makes little improvemnet, so is there anything that can be adjusted in the oil pump for low RPM so the RPM gets so close to zero?
By the way what I mean by zero is around the zero mark but not below it like when the instrument is off:
[img]cid:7103d2dd-ab34-18ed-df6f-a847ff79e9aa(at)yahoo.com[/img]">
[img]cid:d5870462-6744-146f-5cc9-2325c6cb5aaa(at)yahoo.com[/img]">
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richard.goode(at)russiana
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| Posted: Thu Jun 17, 2021 2:46 am Post subject: Oil pump adjustment or troubleshooting |
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When you say that cruise oil pressure is "good" – I assume a minimum of five bar? But minimum pressure at idle is one bar, but if it is good at operating rpm, then I suspect it is a sender unit/gauge problem if it is falling to 0 at idle. And, you're correct that there is a conventional adjustment on the pressure-relief valve on the oil pump to adjust pressure, but this only becomes effective at operating pressures. Richard.
RICHARD GOODE AEROBATICS
Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
e-mail: richard.goode(at)russianaeros.com (richard.goode(at)russianaeros.com)
www.russianaeros.com
WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
In partnership with Aerometal Kft, Hungary.
From: owner-yak-list-server(at)matronics.com <owner-yak-list-server(at)matronics.com> On Behalf Of Javier Carrasco
Sent: 16 June 2021 19:18
To: Yak-List Digest List <yak-list-digest(at)matronics.com>; Yak-List Digest Server <yak-list(at)matronics.com>
Subject: Oil pump adjustment or troubleshooting
Hello everyone.
Quick question. My M-14p has an issue that my mechanic has not been able to figure out.
When the oil gets hot the oil pressure drops to zero when the throttle is closed or idle (around 30% rpm), this is only an issue after landing, cruise oil pressure is good and there is no loss of oil while flying for an hour straight and level.
We did find a screw that allow us to turn the oil pressure higher but seems to only work at RPMs over 40%.
Changing the oil to higher grade just makes little improvemnet, so is there anything that can be adjusted in the oil pump for low RPM so the RPM gets so close to zero?
By the way what I mean by zero is around the zero mark but not below it like when the instrument is off:
[img]cid:image001.png(at)01D7636E.3580B9E0[/img]
[img]cid:image002.png(at)01D7636E.3580B9E0[/img]
| | - 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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146.95 KB |
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1270 Time(s) |
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javiercarrascob
Joined: 06 Sep 2009
Posts: 62
Location: Virginia
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| Posted: Thu Jun 17, 2021 6:43 am Post subject: Oil pump adjustment or troubleshooting |
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Thanks Richard, I was praying for your reply 
Yes min of 5 bar. I will discuss this with my mechanic.
It narrows it down a lot.
Thanks a lot,
Javier
On Thursday, June 17, 2021, 7:03:54 AM EDT, Richard Goode <richard.goode(at)russianaeros.com> wrote:
When you say that cruise oil pressure is "good" – I assume a minimum of five bar? But minimum pressure at idle is one bar, but if it is good at operating rpm, then I suspect it is a sender unit/gauge problem if it is falling to 0 at idle. And, you're correct that there is a conventional adjustment on the pressure-relief valve on the oil pump to adjust pressure, but this only becomes effective at operating pressures. Richard.
RICHARD GOODE AEROBATICS
Rhodds Farm, Lyonshall, Hereford, HR5 3LW, UK
Tel: +44 (0)1544 340120 Fax: +44 (0)1544 340129
e-mail: richard.goode(at)russianaeros.com (richard.goode(at)russianaeros.com)
www.russianaeros.com
WORLD LEADERS IN RUSSIAN SPORTING AIRCRAFT & ENGINES
In partnership with Aerometal Kft, Hungary.
From: owner-yak-list-server(at)matronics.com <owner-yak-list-server(at)matronics.com> On Behalf Of Javier CarrascoSent: 16 June 2021 19:18To: Yak-List Digest List <yak-list-digest(at)matronics.com>; Yak-List Digest Server <yak-list(at)matronics.com>Subject: Oil pump adjustment or troubleshooting
Hello everyone.
Quick question. My M-14p has an issue that my mechanic has not been able to figure out.
When the oil gets hot the oil pressure drops to zero when the throttle is closed or idle (around 30% rpm), this is only an issue after landing, cruise oil pressure is good and there is no loss of oil while flying for an hour straight and level.
We did find a screw that allow us to turn the oil pressure higher but seems to only work at RPMs over 40%.
Changing the oil to higher grade just makes little improvemnet, so is there anything that can be adjusted in the oil pump for low RPM so the RPM gets so close to zero?
By the way what I mean by zero is around the zero mark but not below it like when the instrument is off:[img]cid:v1LKRmUTDnv8tqi9rINy[/img]
[img]cid:LhKWYPY3kaPce3qvLSlz[/img]
| | - 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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| Description: |
|
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146.95 KB |
| Viewed: |
1268 Time(s) |
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| Description: |
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| Filesize: |
1.47 MB |
| Viewed: |
1268 Time(s) |
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