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06-08-2012, 12:02 PM
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Join Date: Mar 2007
Location: Indiana
Posts: 67
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RV-7A engine near failure?
My buddy has a 7A with 180, cs, AFP pump, filter and injection. He took off relatively cold and the engine went to rough idle shortly on climb out and he made a safe landing. On touch down, then engine caught up and ran perfectly.
Test flight. No problems up to 8K altitude (from 580 Ft). This time, on pitch over, the engine did the same thing. Mags, fuel selector, boost pump, no effect. Negative Gs, positive Gs, hard banking, no effect. No frank indications on any gauges. Had to land again at rough idle. Got on the ground, tapped the brakes, engine caught back on and ran fine.
His A&P is baffled, and so am I. Any ideas?
Thanks!
CONCLUSION: Turned out to be contamination beyond the filter screen inside the Airflow Performance fuel controller. Some fibers had evidently slipped through the pores in the filter and clogged the inlet. When you pulled the filter out, nothing was in it. Up inside where it seated, a glob of clog blocked the fuel flow. The controller had to be completely disassembled (by Don @ AP) and returned to service. Very weird. No signs of any debris ANYWHERE in the entire fuel system. Hopefully pictures are forthcoming.
Last edited by DocThrock : 07-04-2012 at 11:13 AM.
Reason: Engine starvation problem solved.
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06-08-2012, 12:19 PM
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Join Date: Jan 2005
Location: CA
Posts: 70
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How about checking the engine air intake to make sure there is plenty of air for proper fuel burned
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06-08-2012, 12:26 PM
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Join Date: Jun 2005
Posts: 3,275
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New plane?
Has anything been worked on since it last operated normally?
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06-08-2012, 12:26 PM
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Join Date: Nov 2005
Location: Snohomish, Washington
Posts: 699
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Hours?
How many hours on the engine?
Sounds a lot like the classic Lycoming sticky valve guide to me.
__________________
Don Jones
Technical Support Manager
Dynon Avionics
CFI-IA, AGI, IGI
RV9-A
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06-09-2012, 09:45 PM
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Join Date: Aug 2006
Location: Twin Falls, ID
Posts: 683
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Does he have the purge valve. Make sure all the fittings from the purge valve back are tight and there are no cracks in any of the flare fittings that would allow air in the system. I had the same thing happen on mine after I had the baffle off and I had only finger tightened the purge valve fitting. Don
__________________
RV 7 N212MD Flying as of 12/22/2007
Backcountry/TCOW Super Cub flying 03/12/2011
Next project?
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06-10-2012, 12:15 AM
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Senior Curmudgeon
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Join Date: Sep 2005
Location: Dayton Airpark, NV A34
Posts: 15,420
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Quote:
Originally Posted by DocThrock
On touch down, then engine caught up and ran perfectly.
Got on the ground, tapped the brakes, engine caught back on and ran fine.
His A&P is baffled, and so am I. Any ideas?
Thanks!
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There is a story here, ----- what is the common feature that landing will effect.
I would look closely at the fuel system.
Is there anything in the fuel tank floating around that could block the pickup???
Is there a flop tube than could be in the wrong position??
I have seen the same symptoms in a R/V aircraft that had the fuel pickup in the wrong location.
__________________
Mike Starkey
VAF 909
Rv-10, N210LM.
Flying as of 12/4/2010
Phase 1 done, 2/4/2011 
Sold after 240+ wonderful hours of flight.
"Flying the airplane is more important than radioing your plight to a person on the ground incapable of understanding or doing anything about it."
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06-10-2012, 07:17 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,687
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Quote:
Originally Posted by Don Jones
How many hours on the engine?
Sounds a lot like the classic Lycoming sticky valve guide to me.
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I would have to agree with Don, sounds like typical Lycoming "morning sickness".
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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06-10-2012, 07:40 AM
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Join Date: Aug 2005
Location: Mendon South Carolina
Posts: 1,391
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Quote:
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AFP pump, filter and injection.
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Just as the fuel line enters the AFP fuel controller there is a very small very fine filter. If it is starting to get clogged it will cause those exact symptoms.
It should be pulled and cleaned at every oil change.
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Milt Concannon
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06-10-2012, 08:01 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,687
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Quote:
Originally Posted by N395V
Just as the fuel line enters the AFP fuel controller there is a very small very fine filter. If it is starting to get clogged it will cause those exact symptoms.
It should be pulled and cleaned at every oil change.
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This why I don't like to do blind "internet troubleshooting".
Doc said in his first post that he and his A&P are baffled, this would lead me to "assume" that they have done some preliminary troubleshooting which "to me", would normally include checking pressures, making sure there are no obstructions, cleaning/checking filters, checking fitting security etc etc..
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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06-10-2012, 08:01 AM
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Join Date: Sep 2005
Location: Dothan, Alabama
Posts: 1,487
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Don't forget the issue with the flop tube coming off inside the tank. I didn't see that he switched tanks.
__________________
Alton DeWeese
N526RV RV7A Tip Up, IO360 180 W/Hartzel BA prop.
Flying ~950 hours since Aug 2010
N4IDH
Construction Log
?The secret of getting ahead is getting started. The secret of getting started is breaking your complex overwhelming tasks into small manageable tasks, and then starting on the first one.?
?Mark Twain
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