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Engine won't stay running

Old 07-18-2003, 04:27 PM
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Mr. Nitro
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Default Engine won't stay running

I have a Thunder Tiger MKII Trainer with a GP .42 and when I start it it will run for about 5 seconds, sputter, and then die. Its practically a new engine, I've ran it only about 8 times, only two of those runs have been in the air. The last time I ran it was about 4 months ago and it ran fine. I drained all the gas out (ran it out of the carb too) and put a cap on the carb intake. It sounds like an air leak to me but I'm not sure. Where all do I check at on a plane? I race nitro cars and trucks and this is my first plane, so I don't know too much about them yet. Any help would be greatly appreciated. Thanks!!

Justin
Old 07-18-2003, 06:53 PM
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CCDave
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Default Engine won't stay running

You did mention any troubleshooting you had tried so I'll start with the obvious...

First put in a new glow plug... A burnt glow plug can cause that.

Second... Make sure your Needle valve and fuel system is free of trash.

Third... Check your fuel... Is it old?

If you have tried all these things you could look for air leaks in your fuel system...

My guess is that if it isn't a bad plug you have trash in your fuel system.

Hope that helps!
Old 07-18-2003, 07:24 PM
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MinnFlyer
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Default Engine won't stay running

It could be that the engine is running too rich or too lean. Do you need to prime it after each 5 second run?
Old 07-18-2003, 08:30 PM
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Mr_Scale
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Default Engine won't stay running

Could be numerous things. All the above is good advise. Following is a simple way to check for an air leak. Remove the carb line and the pressure line if there is one. Plug one line or hemostat it closed. Pressurize the tank simply by blowing in the other line, then plug or clamp it. Let it set for about five minutes. Remove a plug or clamp, you should get a rush of air. If you do the tank is holding pressure, it not, you have a leak some where.
You may have contaminated fuel if it has been sitting for 4 months and not stored properly. I would suggest that if everything else checks out, get fresh fuel. Worse case you could have some rusted bearings or some other issue like that that would be hard to find. If all else fails send the motor to a service center.
Old 07-18-2003, 10:29 PM
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Mr. Nitro
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Default Engine won't stay running

Thanks for the tips, actually the fuel is over a year old but it still burns great! I just went out and messed with it some more and once I get it started, if I keep blowing into the pressure line it will stay running, but as soon as I quit blowing into it, it dies. Definately sounds an air leak somewhere, but where do I check, I can't really see the tank without tearing the whole cockpit off but I will try your way, Mr_Scale

Thanks again,

Justin

P.S. I'll let you know what happens.
Old 07-19-2003, 12:08 AM
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Geistware
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Default Engine won't stay running

Is the stopper on the tank at the center of the carburetor barrel.
Old 07-19-2003, 01:10 AM
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Default Engine won't stay running

Ok, thanks guys, I fixed the problem. The cap that screws onto the tank where the fuel line goes in was loose and the needle base on the carb was loose so I tightened them and fired it right up. She runs like a charm now!! Thanks again

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