Trouble starting cold

H. Paul Shuch is a Light Sport Repairman with Maintenance ratings for airplanes, gliders, weight shift control, and powered parachutes, as well as an independent Rotax Maintenance Technician at the Heavy Maintenance level. He holds a PhD in Air Transportation Engineering from the University of California, and serves as Director of Maintenance for AvSport of Lock Haven.

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David
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Joined: Thu Mar 23, 2006 10:49 pm
Location: Ellsworth ME, KBST
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Trouble starting cold

Postby David » Sun Oct 02, 2016 6:50 pm

Difficulty starting my 912 when cold. This just started happening, I sent my carbs off to lockwood for the 5 year service. They came back and I installed them today. I still had problems starting, eventually got it going, sync'd the carbs and set the idle. Things looked good and started no problem when it as warm.

Let it sit for 4 hours and tried it again (no Joy). The Video was taken from on my iPhone.


http://www.youtube.com/watch?v=A4g5kJnuFcM


I did check the choke is working, still no good. It seams like the starter disengages after the hint of it wanting to start. I have been reading about the Sprag clutch and wonder if that is my problem.

Any help would be appreciated in trouble shooting the problem.
David
EAA 1434 Belfast ME
RV12 EAB - Maiden flight 8/30/12
David's RV12 http://www.rv12pilot.com

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David
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Re: Trouble starting cold

Postby David » Mon Oct 03, 2016 10:11 am

Talked to Lockwood and they confirmed what I thought. Sprag clutch, I'll be pulling the Rotax over the next couple of weekend. :(

He looked at the video before we talked and confirmed the issue. He said you have plenty of power, plus I had already confirmed it last night.
David
EAA 1434 Belfast ME
RV12 EAB - Maiden flight 8/30/12
David's RV12 http://www.rv12pilot.com

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David
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Location: Ellsworth ME, KBST
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Re: Trouble starting cold

Postby David » Mon Oct 24, 2016 8:55 pm

Image

All that work to get to the sprag clutch.

Image


It is now back together after a mastercharge shopping spree at Lockwood's

Image

This weekend planning to reinstall i :D
David
EAA 1434 Belfast ME
RV12 EAB - Maiden flight 8/30/12
David's RV12 http://www.rv12pilot.com

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drseti
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Re: Trouble starting cold

Postby drseti » Tue Oct 25, 2016 3:47 pm

How many engine hours, David? I seem to recall you bought a used 912 when you built the RV12?
The opinions posted are those of one CFI, and do not necessarily represent the FAA or its lawyers.
Prof. H. Paul Shuch, Ph.D., CFII, LSRM-A/GL/WS/PPC, iRMT
AvSport of Lock Haven
fly@AvSport.org
http://AvSport.org
http://facebook.com/SportFlying

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David
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Joined: Thu Mar 23, 2006 10:49 pm
Location: Ellsworth ME, KBST
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Re: Trouble starting cold

Postby David » Tue Oct 25, 2016 6:19 pm

drseti wrote:How many engine hours, David? I seem to recall you bought a used 912 when you built the RV12?


Partially correct - the 912 was in my Sport Hornet and I reinstalled it in the RV12. The Rotax only had 60 hours on it before the 12, now 330 but 8 years old. It did not fly in the hornet for a few years.
David
EAA 1434 Belfast ME
RV12 EAB - Maiden flight 8/30/12
David's RV12 http://www.rv12pilot.com


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