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O-320-D3G Stalls when Idling

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genie(at)swissmail.org
Guest

Posted: Mon Aug 02, 2010 12:45 pm Post subject: O-320-D3G Stalls when Idling

My Lycoming O-320-D3G started and ran flawlessly last Saturday. I 

revved up to 1800 rpm, cut the magnetos and then applied carb heat, 

all without problems. But when idling it vibrated and stalled 

instantly after that. I restarted and found out that this behaviour 

was independent on whether the carb heat was on or off. It must be 

said that this engine has not run for some two to three months.



What could the cause and remedy of this problem be? In the operator's 

manual I see in Section 7 page 7-6 Figure 7-1 that there is a screw 

for idle mixture adjustment and one for idle speed adjustment. Should 

I enrich or impoverish the mixture, should I increase the idle speed, 

or what? Thanks.



George Nielsen

genie(at)swissmail.org

Vans RV-6 PH-XGN

The Netherlands

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flyadive(at)gmail.com
Guest

Posted: Tue Aug 03, 2010 3:37 pm Post subject: O-320-D3G Stalls when Idling

George:

  

 Start with the basics:

  

 Fuel - Correct octane

 Fuel Switch - To tank with fuel.

 Primer in and Locked

 Mixture - Full Rich

 Throttle - 1/4" in

 Mags on BOTH

 This should give you 1000 RPM

 Now try...

 What is the idle showing?  650 to 700 RPM?

 Do you have a fuel flow gage?  At idle it should be about 2 GPH.

 Have you PRE FLIGHTED the plane?  Are your Breather Vents Clear?

 Check - Tank Vents 

 Check - Breather Tube

 How is your AIR FILTER?  

 How is any SCAT Tubing going to the Carb?

 Any collapsed SCAT?

 Any Birds nests?

 Ingest any birds lately?

 Any SCAT/SKEET de-laminating?

 How is the Range of Motion of the:

 Mixture Control?

 Throttle Control?

 When was the last time you inspected the Carb Bowl Filter?

 Or drained the Carb Bowl?

 Check the rubber coupling between the intake tubes and sump:

 Any cracking?

 Over tightening of the clamps.

 Do you have an Alternate Vacuum System that runs off the intake?

 Check it for leaks.

  

 Q:  When it dies ... Does it die because if a LEAN MIXTURE or a RICH MIXTURE?

 What color are your plugs and exhaust pipe?

  

 OK, enough for this list... You've got some checking to do.

  

 Let us know how you made out.

  

 Barry

  

  

  

 



 

 On Mon, Aug 2, 2010 at 4:43 PM, George Nielsen <genie(at)swissmail.org (genie(at)swissmail.org)> wrote:

 [quote]--> LycomingEngines-List message posted by: George Nielsen <genie(at)swissmail.org (genie(at)swissmail.org)>

 

My Lycoming O-320-D3G started and ran flawlessly last Saturday. I revved up to 1800 rpm, cut the magnetos and then applied carb heat, all without problems. But when idling it vibrated and stalled instantly after that. I restarted and found out that this behaviour was independent on whether the carb heat was on or off. It must be said that this engine has not run for some two to three months.

 

What could the cause and remedy of this problem be? In the operator's manual I see in Section 7 page 7-6 Figure 7-1 that there is a screw for idle mixture adjustment and one for idle speed adjustment. Should I enrich or impoverish the mixture, should I increase the idle speed, or what? Thanks.

 

George Nielsen

genie(at)swissmail.org (genie(at)swissmail.org)

Vans RV-6 PH-XGN

The Netherlands



http://www.matronics.com/Navigator?Lyc======================

  http://forums.mle, List Admin.

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