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  #1  
Old 08-06-2019, 09:27 AM
Drippy Drippy is offline
 
Join Date: Nov 2015
Location: Vermont
Posts: 143
Default Rough Idle after Shutdown

Guys,

I have a little over 200hrs on my IO540 and for the first time on shut down yesterday it continued to idle (very roughly) after I pulled the mixture to idle cut off. I let it go for a 10-20 seconds verifying the mixture was full back and ended up killing it with the ignition switch.

I have a light speed II ignition with back-up mech mag.

The only thing different from every other day was it was warm 85F+ but I have flown on other days like that with no issue.

I was thinking my mixture setting on the throttle may need a little adjusting but figured I should ask.

Thanks
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N95VT
RV10
~400hrs flying
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  #2  
Old 08-06-2019, 10:39 AM
woxofswa woxofswa is offline
 
Join Date: Sep 2007
Location: Mesa Arizona
Posts: 662
Default

Check the ground on the mag, but be careful with the prop because if the ground wire has broken, the mag is hot (active).
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RV-10 N24EV
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  #3  
Old 08-06-2019, 11:09 AM
cajunwings cajunwings is offline
 
Join Date: Jun 2007
Location: new iberia la
Posts: 869
Default Shutdown

If you have the Bendix fuel servo the ?fuel cutoff valve? part is not doing its job. It?s just 2 steel plates that slide against each other and sometimes they wear a little and won?t stop all the fuel flow. They can be removed and polished to restore function.

Don Broussard
RV9 Rebuild in Progress
57 Pacer
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  #4  
Old 08-06-2019, 01:03 PM
airguy's Avatar
airguy airguy is offline
 
Join Date: Oct 2006
Location: Garden City, Tx
Posts: 5,596
Default

Quote:
Originally Posted by cajunwings View Post
If you have the Bendix fuel servo the ?fuel cutoff valve? part is not doing its job. It?s just 2 steel plates that slide against each other and sometimes they wear a little and won?t stop all the fuel flow. They can be removed and polished to restore function.

Don Broussard
RV9 Rebuild in Progress
57 Pacer
That, or the fuel in the line between the servo and spider is hot enough to boil, and that is pushing the vapor/liquid mix through the spider and giving just enough lean fuel mix to keep kicking for several seconds. 85F and 100LL fuel, this is not real likely, but it's possible.
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Greg Niehues - SEL, IFR, Repairman Cert.
Garden City, TX VAF 2021 dues paid
N16GN flying 900 hrs and counting; IO360, SDS, WWRV200, Dynon HDX, IFD440, G5
Built an off-plan RV9A with too much fuel and too much HP. Should drop dead any minute now.
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  #5  
Old 08-06-2019, 01:09 PM
Drippy Drippy is offline
 
Join Date: Nov 2015
Location: Vermont
Posts: 143
Default Plates

I have the Bendix throttle - not sure about cracking it open though I had it rebuilt about 2 years ago when I did the engine overhaul.

Are they easy to get at?
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N95VT
RV10
~400hrs flying
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  #6  
Old 08-06-2019, 01:35 PM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 6,724
Default

Quote:
Originally Posted by cajunwings View Post
If you have the Bendix fuel servo the ?fuel cutoff valve? part is not doing its job. It?s just 2 steel plates that slide against each other and sometimes they wear a little and won?t stop all the fuel flow. They can be removed and polished to restore function.

Don Broussard
RV9 Rebuild in Progress
57 Pacer
I would also make sure your cable linkage has drifted or moved, preventing you from fully retracting the mixture arm on the servo.

Larry
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  #7  
Old 08-06-2019, 01:50 PM
F1R F1R is offline
 
Join Date: Nov 2010
Location: ____
Posts: 912
Default The Best Odds

Quote:
Originally Posted by lr172 View Post
I would also make sure your cable linkage has drifted or moved, preventing you from fully retracting the mixture arm on the servo.

Larry
Most probable and the easiest to check.
With your mix lever in the cockpit at cut off, have a close look at the stop and mixture arm on the bendix servo body.
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  #8  
Old 08-07-2019, 10:17 AM
Drippy Drippy is offline
 
Join Date: Nov 2015
Location: Vermont
Posts: 143
Default Mech

Guys,

Great advice from all I will check the linkage first.
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N95VT
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~400hrs flying
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  #9  
Old 08-07-2019, 01:03 PM
mahlon_r mahlon_r is offline
 
Join Date: Jan 2005
Posts: 1,060
Default

Check rigging to make sure mixture cable is hitting the ICO stop.
If good
Disconnect hose to flow divider
Put boost pump on with mixture in Ico.
No more than drip every few seconds allowed. If any flow get servo fixed or lap mixture plates yourself.( if you are comfortable with that)
If no flow
Get flow divider serviced or take apart and clean again if you are comfortable doing that.
Good Luck,
Mahlon
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  #10  
Old 08-08-2019, 10:05 AM
sdflier sdflier is offline
 
Join Date: Aug 2006
Location: Sioux Falls, SD
Posts: 80
Default run higher RPM at shutoff

Run your RPM higher at shutoff will actually help avoid run-on
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RV-6A N289CH flying 1200+ hours

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