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HelicopterBeginners Corner › Engine Starting Problem and it STINKS
10-25-2004 02:23 AM  13 years agoPost 1
sean

rrNovice

Wappingers Falls,​New York, USA

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I have a WEBRA .32 and i have tried for 2 hours this weekend to start it and cannot get it running. The engine was running perfectly 2 weeks ago when i last flew it. The gas is new, the glow plug was 3 weeks old used 3 flights. I havent changed any needle settings from the last perfect flight. The low speed is 5 turns , the high is 2. i have played around with all combinations of the needles and nothing. After the heli has been sitting for over an hour it will start and run for 2 seconds and quit, and i tried richening the low speed. After priming, when i am holding the starter on white smoke will come out of the exhaust but it will not start. i tried cleaning out the carb and checking for tank pressure, filter clean. I have had the heli for some time now and have not done any "stupid" or "beginner" mistakes in starting it. The temp was about 50F outside. Please help me out. Please!! I would really appreciate any advice.

Thanks,

Sean

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10-25-2004 02:43 AM  13 years agoPost 2
RRuiz

rrApprentice

Puebla, Mexico

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Maybe I will say some things you have thought but let me repeat to you...
- Do you review the battery of the sparking plug?
- Do you test the sparking plug outside of the engine to see it is burning?
- Have you tried to start the heli with the plug not so tight (maybe because the engine is new and the current preasure is to high?
- is the carb open a little?
- Can you tried the turns only 1 1/2 open?
- do you have the muffler open at the end (sometimes I leave paper to prevents leaks while storaged) ?
Hope this helps

Roberto

Don't let confidence exceed ability

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10-25-2004 03:24 AM  13 years agoPost 3
Ted Toth

rrElite Veteran

Myrtle Beach S.C.

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the glow plug was 3 weeks old used 3 flights
Sean a glow plug is like a incandescent light bulb, it can fail the
first use the first day or last and last.
when in doubt change the plug you don't have to discard it just change
it. For me this is my first option when a engine wont fire after un- clipping the fuel cutoff

.

You don't stop laughing because you grow old, you grow old because you stopped laughing.

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10-25-2004 03:42 AM  13 years agoPost 4
Boom_Strike

rrNovice

Littleton, CO

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Ted is right. Glow plug. Those things go whenever and wherever.

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10-25-2004 04:30 AM  13 years agoPost 5
Fullagas

rrKey Veteran

Michigan

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.
It runs for a couple seconds, so the plug seems good. Change all the fuel lines, including the pickup line in the tank. A pinhole can drive you nuts. Set the carb to factory settings. I only say that because 5 turns out on the low needle seems high. If this doesn't work, I'd pull the engine and check for leaks in a tub of water - basically plug the exhaust and intake with your fingers, then blow through some fuel tubing into the carb inlet while looking for bubbles to form around the carb base, needle area, etc.

Good luck, let us know what you find.

.

Flying helis since gyros had springs.

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10-25-2004 05:46 AM  13 years agoPost 6
okw14

rrApprentice

Morgantown, WV

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I've never owned a Webra, but I'd agree that 5 turns on the idle mixture (low speed) needle seems high. If it starts after it sits for a while, that sounds to me like it might be flooded. If it's already rich and you prime it more, that will flood the thing and you'll have to either crank the engine with the fuel shut off to get the excess fuel out or let it sit for a while. Try about 2-2.5 turns out on the idle mixture needle and see if that helps.

Good luck.

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10-25-2004 05:17 PM  13 years agoPost 7
Wisdom-Seeker

rrVeteran

Danville, CA

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Have you disassembled the carb to clean out any possible debris? Since your engine runs, burns off the prime and then stops, it sounds like it's starving for fuel. There is only a few ways that this can happen:

1. Fuel blockage. Besides debris in the carb, this could also be a folded clunk line inside the tank.

2. A vacuum leak in the crankcase. This can be a loosely seated carb or a loose backplate.

3. Lack of pressure in the fuel feed. This can be a leaky muffler pressure line, leaking around the fuel tank plug, or a leak in the fuel tank itself. This is easy to test. Disconnect the fuel feed and muffler lines. Put a small amount of fuel into the tank. Pinch off the fuel feed, and blow into the muffler line. Pinch off the muffler line to trap the pressure that you just blew into the tank. After a second or two, hold the fuel feed line above the liquid level in the tank, and open it. Fuel should squirt out of the line. If it does not, then you have a pressure leak.

--

Wisdom-Seeker
Protest letter to insurance co.: What do you mean "Act of God"?

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10-25-2004 06:20 PM  13 years agoPost 8
FAA

rrApprentice

MIlford CT

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I would recomend that you replace the spark plug and try again.

It sounds to me like a bad or marginal spark plug.

It is an easy thing to do, and it would eliminate that possibility of failure prior to you going on and replacing fuel lines.

Nick

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10-26-2004 02:54 AM  13 years agoPost 9
sean

rrNovice

Wappingers Falls,​New York, USA

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ok, i tried starting my heli today and here's how it went. fuel tubes and tank pressure are OK. the low was 2.2 and the high 1.5 turns. after priming, the first time i tried starting, it started perfectly, ran for 3 seconds, sounded like it wound down and quit. it wouldnt start again after that. i took the fuel out and wanted to try again to burn some gas in the engine from before. i started it and it ran perfectly for 10 seconds before the fuel in the engine was depleated. i was able to take the glow plug off w/ out it stalling so i know the glow plug is fine. Why did it run perfectly with no fuel in the line? it looks like all the fuel was drained already from the card when it ran.

Thanks,
Sean

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10-26-2004 03:56 AM  13 years agoPost 10
okw14

rrApprentice

Morgantown, WV

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I'm still thinking that it's a little too rich. If it ran for 10 seconds without the fuel line connected, it must have had a bunch of fuel in the crankcase already, which would have been the cause of the engine quitting the first time it started.

Try closing the low speed needle just a few degrees more. It normally doesn't take much on this needle to make a difference when it's close. I'd leave the high speed needle where it is for now.

If you get it started again and it sounds like it's going to quit on you, pinch the fuel line and see if it picks up speed. This is also an indication of a rich condition. If this is the case, try closing the low speed needle a few degrees more.

I hope this helps. If not, you might also try posting in the Engine forum. Probably find people that know a lot more about engines than I do (and that's not hard to do! ).

Keith

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10-27-2004 06:08 AM  13 years agoPost 11
Andrew_S

rrVeteran

Gaston, South​Carolina

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I had 1 that did goofy things too....I found out the head bolts were loose. I took 'em all the way out and checkedout the head and cleaned it and reinstalled it....Worked fine ever since........

Drewskie

www.congareeflyersinc.com

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10-27-2004 11:36 PM  13 years agoPost 12
sean

rrNovice

Wappingers Falls,​New York, USA

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ok maybe i'll try that. ive never taken the head off before, do you have to touque it on or how tight should it be?

Thanks

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10-28-2004 12:20 AM  13 years agoPost 13
Wisdom-Seeker

rrVeteran

Danville, CA

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do you have to touque it on or how tight should it be?
What is most important is that you do not tighten the bolts in one go. Put the head in place, and then tighten each bolt gently until it is just touching the head. Hold the head down and apply gentle force and tighten each bolt gently in opposing pairs (each bolt on the exact opposite side of the head) like:

1
5 \ | / 3
4 / | \ 6
2

ARRGH! the extra space eliminator keeps wrecking my diagram!

Keep going around this pattern gradually applying more and more torque until the bolts are firmly in place, but not so tight that you would have to use a torque wrench to undo it.

If you don't do it this way, you may not seat the head properly, or you may actually deform the head.

--

Wisdom-Seeker
Protest letter to insurance co.: What do you mean "Act of God"?

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