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Epistaxis
Joined: 19 Dec 2010
Posts: 13
Location: Nebraska, USA
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 Posted: Fri May 03, 2013 3:06 pm Post subject: yak 55 engine surge, in flight |
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Hello, have a Yak55 which just presented with an engine or prop surge, after doing moderate acro. Initial indication was a rapid loss in performance. After throttle back, settled down to a constant surge. Fuel pressure was good and constant,have checked the entire fuel system everything is clean and clear. Can`t duplicate the problem on the ground during runup. But did surge again on next test flight. Would like to know if the aneriod diaphragm or the larger pressure diaphragm were failing could cause this, although no garbage was found in the carb screens. Or should I focuse on the prop and governor. Governor screen is clean as well. Has anybody run across this situation? Thanks
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viperdoc(at)mindspring.co
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| Posted: Fri May 03, 2013 3:47 pm Post subject: yak 55 engine surge, in flight |
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Have had the aneroid diaphragm cause surging and have had engine failure at 100% T.O. Power due to a flapper in the fuel line that broke off and blocked the carb fuel screen. With the flapper the surge was intermittent at high power settings. It improved with power reduction. The diaphragm was most noticeable at 5000 to 6000 ft.
Doc
Sent from my iPad
On May 3, 2013, at 6:06 PM, "Epistaxis" <ShawnJBurwell(at)aol.com> wrote:
| Quote: |
Hello, have a Yak55 which just presented with an engine or prop surge, after doing moderate acro. Initial indication was a rapid loss in performance. After throttle back, settled down to a constant surge. Fuel pressure was good and constant,have checked the entire fuel system everything is clean and clear. Can`t duplicate the problem on the ground during runup. But did surge again on next test flight. Would like to know if the aneriod diaphragm or the larger pressure diaphragm were failing could cause this, although no garbage was found in the carb screens. Or should I focuse on the prop and governor. Governor screen is clean as well. Has anybody run across this situation? Thanks
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=399918#399918
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javiercarrascob
Joined: 06 Sep 2009
Posts: 62
Location: Virginia
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| Posted: Fri May 03, 2013 5:21 pm Post subject: yak 55 engine surge, in flight |
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I used to have a similar issue but after prolonged discent at lw RPM settings.
After changing to the auto spark plugs an keeping the temps over 150. never had it again.
Good luck.
Javier Carrasco
Yak-55m
N5245H
--- On Fri, 5/3/13, Epistaxis <ShawnJBurwell(at)aol.com> wrote:
| Quote: |
From: Epistaxis <ShawnJBurwell(at)aol.com>
Subject: yak 55 engine surge, in flight
To: yak-list(at)matronics.com
Date: Friday, May 3, 2013, 7:06 PM
--> Yak-List message posted by: "Epistaxis" <ShawnJBurwell(at)aol.com (ShawnJBurwell(at)aol.com)>
Hello, have a Yak55 which just presented with an engine or prop surge, after doing moderate acro. Initial indication was a rapid loss in performance. After throttle back, settled down to a constant surge. Fuel pressure was good and constant,have checked the entire fuel system everything is clean and clear. Can`t duplicate the problem on the ground during runup. But did surge again on next test flight. Would like to know if the aneriod diaphragm or the larger pressure diaphragm were failing could cause this, although no garbage was found in the carb screens. Or should I focuse on the prop and governor. Governor screen is clean as well. Has anybody run across this situation? Thanks
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=399918#399========================http://www.matronics.com/Navigator?Ybsp; - MATRONICS WEB FORUMS - href="http://forums.matronics.com/" target=_blank>http://forums.matronbsp; - List Contribution Web Site -http://www=======================
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[quote][b]
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Epistaxis
Joined: 19 Dec 2010
Posts: 13
Location: Nebraska, USA
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| Posted: Fri May 03, 2013 5:43 pm Post subject: Re: yak 55 engine surge, in flight |
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Doc, thanks for the response, could you please clarify where you found sections of the flapper valve, which filter IE...course or fine on the firewall or in the carb inlet course screen, and was this part of the emergency fuel shut off flap. In addition, this evening after returning to the hanger and after the test flight this afternoon have found fuel dripping from and around the spray bar in the carb venturi. Thanks
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viperdoc(at)mindspring.co
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| Posted: Fri May 03, 2013 6:17 pm Post subject: yak 55 engine surge, in flight |
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A 6 mm and a 4 mm fragment of the inner liner of the main fuel line to the carb. We found it in the finger screen in the carb. It is not uncommon to have a small amount of fuel drip out of the carb after shutdown especially if you do not advance the throttle to wide open just as you cut the mags off. I am by no means an expert on the carb.
Doc
Sent from my iPad
On May 3, 2013, at 8:43 PM, "Epistaxis" <ShawnJBurwell(at)aol.com> wrote:
| Quote: |
Doc, thanks for the response, could you please clarify where you found sections of the flapper valve, which filter IE...course or fine on the firewall or in the carb inlet course screen, and was this part of the emergency fuel shut off flap. In addition, this evening after returning to the hanger and after the test flight this afternoon have found fuel dripping from and around the spray bar in the carb venturi. Thanks
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=399929#399929
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dsavarese0812(at)bellsout
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| Posted: Sat May 04, 2013 5:48 am Post subject: yak 55 engine surge, in flight |
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Actually the larger chunks of rubber never made it into the finger screen. Only smaller pieces were in the screen. The larger pieces were lodged in the interior end of the finger screen orifice where it makes a 90 degree turn. I had to remove the plate on the outside of the carburetor to gain access to the area where the larger chunks of rubber were lodged.
Dennis
On May 3, 2013, at 9:15 PM, "Roger Kemp M.D." <viperdoc(at)mindspring.com> wrote:
| Quote: |
A 6 mm and a 4 mm fragment of the inner liner of the main fuel line to the carb. We found it in the finger screen in the carb. It is not uncommon to have a small amount of fuel drip out of the carb after shutdown especially if you do not advance the throttle to wide open just as you cut the mags off. I am by no means an expert on the carb.
Doc
Sent from my iPad
On May 3, 2013, at 8:43 PM, "Epistaxis" <ShawnJBurwell(at)aol.com> wrote:
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> Doc, thanks for the response, could you please clarify where you found sections of the flapper valve, which filter IE...course or fine on the firewall or in the carb inlet course screen, and was this part of the emergency fuel shut off flap. In addition, this evening after returning to the hanger and after the test flight this afternoon have found fuel dripping from and around the spray bar in the carb venturi. Thanks
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Dale
Joined: 30 May 2007
Posts: 178
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| Posted: Sun May 05, 2013 5:08 pm Post subject: Re: yak 55 engine surge, in flight |
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had this happen to me at a airshow formation flight, turned out to be the prop governor . Surged at all 70% and higher power settings but was barely noticeable at lower power settings. i replaced it and my problem went away.
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