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hgmckay
Joined: 23 May 2006
Posts: 397
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 Posted: Wed Oct 10, 2012 8:12 am Post subject: Rotax 912 UL - Re-starting Problem |
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I have recently begun having a problem restarting my engine after flying, landing and then doing a re-start. The engine is hot so I follow the correct procedure of keeping the choke closed and cracking the throttle. In the past I have had no problem on re-starting using this method, but now the engine will try to start and it will run very rough for some seconds (5 to 10 seconds), but then it quits. I repeat the start, but the same thin occurs. If I let the engine sit for say 5 to 10 minutes and try again the engine will start as normal. This is occurring every time I fly, land, cut the engine off, and then try to restart. Every thing else is fine. I can’t figure out what may be causing this. Any suggestions?
Hugh G. McKay III, P.E.
Allegro 2000
Rotax 912 UL, 579 hours
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bob(at)fly-ul.com
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| Posted: Wed Oct 10, 2012 9:00 am Post subject: Rotax 912 UL - Re-starting Problem |
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On 09:11 AM 10/10/2012, Hugh McKay wrote:
Vapor lock?
--
Bob Comperini
e-mail: bob(at)fly-ul.com
WWW: http://www.fly-ul.com
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daberti(at)sbcglobal.net
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| Posted: Wed Oct 10, 2012 9:07 am Post subject: Rotax 912 UL - Re-starting Problem |
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Check that the choke/enriching circuit is completely closed and check the plug gaps.
Sent from my iPad
On Oct 10, 2012, at 11:11 AM, "Hugh McKay" <hgmckay(at)bellsouth.net (hgmckay(at)bellsouth.net)> wrote:
[quote] I have recently begun having a problem restarting my engine after flying, landing and then doing a re-start. The engine is hot so I follow the correct procedure of keeping the choke closed and cracking the throttle. In the past I have had no problem on re-starting using this method, but now the engine will try to start and it will run very rough for some seconds (5 to 10 seconds), but then it quits. I repeat the start, but the same thin occurs. If I let the engine sit for say 5 to 10 minutes and try again the engine will start as normal. This is occurring every time I fly, land, cut the engine off, and then try to restart. Every thing else is fine. I can’t figure out what may be causing this. Any suggestions?
Hugh G. McKay III, P.E.
Allegro 2000
Rotax 912 UL, 579 hours
<Hugh.vcf>
[b]
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Wed Oct 10, 2012 5:53 pm Post subject: Re: Rotax 912 UL - Re-starting Problem |
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Hi Hugh,
Make sure the float level in the carbs are at 10.5mm in height from the outside edge of the carb. When were the carbs last rebuilt? If it is over 5 years regardless of hours you may want to do an overhaul. Check the floats and make sure one isn't sinking (flooding) under pressure right after you stop. Plug gap between .023 - .027 and not over 75 hours old. new fuel pump or old? Do you have a fuel re-circulation line?
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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hgmckay
Joined: 23 May 2006
Posts: 397
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| Posted: Thu Oct 11, 2012 8:08 am Post subject: Rotax 912 UL - Re-starting Problem |
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Roger,
I don't quite understand your first sentence. Please explain in further
detail. Carbs have not been "rebuilt" since new (550 hours on the carbs - 5
years and 3 months ). I guess to check the floats to see if one is "sinking"
just take the bowl off and fill it with gas and see if the float "floats" or
"sinks". Right?
I will check the plug gap. Old original fuel pump. I do have a fuel
recirculation line.
Hugh G. McKay III, P.E.
Senior Consultant
Worldwide Engineering Inc.
4090 North NC Hwy. 16
Denver, NC 28037
Ph. 704-661-8271
Fax 704-483-5466
email hgmckay(at)bellsouth.net
http://www.wwegeo.com
--
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Thu Oct 11, 2012 10:45 am Post subject: Re: Rotax 912 UL - Re-starting Problem |
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Hi Hugh,
To check float levels you do just remove the bowls and put fuel in with the floats. The float pins should be equal to the fuel level. To check the float arm level you need to turn the carb upside down. Place a mm ruler and place it on the edge of the carb and measure the distance of the float arm up on the ruler. The proper height is 10.5mm. This controls fuel level in the bowl which has a big impact on the way the engine runs.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056 |
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