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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › Fuel Draw OS .50 SX-H and Thunder Tiger RedLine .53
12-02-2015 12:35 AM  32 months agoPost 1
flycatch

rrApprentice

Barstow, California

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Both these engines experienced the prop nut backing out on the same day flying. Fortunately for me it was on startup and not while flying.
I dropped the engines and removed the clutch and fan assemblies. Cleaned off all the old blue Loctite and reassembled. Cure time for the new Loctite is about 24-48 hours and today I installed both engines. When I proceeded to test the first helicopter with the OS engine it would not fire. I looked at the draw line going into the carburetor and it was dry. I'm running WildCat fuel with red dye and this is how I could tell it was not drawing fuel. The second helicopter with the Redline engine has the same identical problem.
It appears trouble comes in pairs. Can some one help me solve this dilemma. This is the first time I have ever had this occur on a 2S glow engine.

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12-02-2015 03:41 AM  32 months agoPost 2
PilotPin

rrApprentice

Indiana -- USA

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If the carb is at idle setting it could take a while to fill the line.

Open the carb all the way and block the exhaust to pressurize the tank and the fuel should shoot right to the carb. Just make sure it can't start when you do this. If this doesn't work you probably have a blockage somewhere. If you have had the line clamped off for a long time it can take a set and stick together and not let fuel through.

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12-02-2015 03:51 AM  32 months agoPost 3
flycatch

rrApprentice

Barstow, California

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Thanks for the reply and I was going to do just that tomorrow. Both engines ran fine until the nuts backed off. This is a complete mystery to me.

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12-02-2015 05:49 AM  32 months agoPost 4
Ladymagic

rrKey Veteran

South Korea

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Something is probably loose, leaking, or blocked....
Like Pilot Pin says, you likely have a simple blockage in your fuel system. On the other hand you might have a leak. If you system will not pressurize then you probably have a pin hole in your fuel tubing or tank somewhere. I would check there plus check your fuel nipples and filter too.

I would also check that your carbs are fully seated and that your heat sinks are not loose.

These problems are usually pretty simple to solve but if you are like me, you have a tendency to assume the simple things aren't the problem and overthink stuff. When you realize how simple the problem was, you just want to kick yourself. Check the simple stuff first...you probably save some time and frustration.

Good luck!

Mellisa

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12-02-2015 01:29 PM  32 months agoPost 5
Tyler

rrElite Veteran

Chicagoland area

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Remove the ignitor from glow plug. Plug the muffler exhaust with a finger. Open the throttle to full. Use starter to crank the engine.

The blocked muffler will force more air into the fuel tank with greater pressure. This will push the fuel to the engine. Also, once you get fuel/oil into the engine, it will help seal the ring gap and increase the engines ability to draw/blow the fuel better.

Once fuel hits the engine you will notice a slight change in the engine's tone while it is cranked. Don't spin the engine for long, as this will hydrolock the engine.

Unplug the muffler. Return throttle to idle. Test crank the engine for a second to ensure the engine will crank. Apply glow power to the plug. Crank the engine.

I don't think you have anything more complicated going on. The engines simply dried out when you were performing your repairs.

If the weather has changed significantly since you last flew, I would guess that the engines both spun the crank shaft nut because the needles needed to be adjusted to accommodate the ambient temperature changes. You may have been too rich or lean.

Tyler

Enjoy things that money can buy IF you don't lose the things money can't buy.

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12-03-2015 12:23 AM  32 months agoPost 6
flycatch

rrApprentice

Barstow, California

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For those who responded to my plea I found the problem. Nothing to do with fuel draw but an air leak. When I reinstalled the engines I added a "T" fitting with filters to each machine. What I did not know that the "O" rings in both units were defective and sucking air. You would have thought that fuel would be leaking out from beneath the seals but that was not the case. I replaced both "Ts" with ones without the filter and everything is back to normal. I appreciated all the suggestions and that is the reason I posted on this forum.

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12-03-2015 03:37 AM  32 months agoPost 7
Ladymagic

rrKey Veteran

South Korea

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Ahh so it WAS your fuel filters.

Fuel filters caused me to burn up two engines and caused me about 4 months of frustration. I always discounted the.filters as the problem because I figured I would know if they were dirty and they were still pretty new.

Turned out they were the problem as they were full of little fuzzies (probably dust trapped in the fuel jug when I opened it for refuel/defuel.) The fuzzies did not fully block fuel flow but restricted it and that was causing my engines to run too lean even with a rich needle setting.

Now filters are the first thing I check if I have tuning problems because they usually cause fuel/air mixture issues when they are either clogged or have bad O-rings that cause air leaks.

Glad you found the problem. Happy flyin!

Mellisa

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12-03-2015 03:50 AM  32 months agoPost 8
Tyler

rrElite Veteran

Chicagoland area

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No more two piece filters for me, I only use the clear plastic align filters. Cheap, easy to inspect, and considered a consumable if in question. No leak, fuel or air.

Enjoy things that money can buy IF you don't lose the things money can't buy.

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12-03-2015 04:00 AM  32 months agoPost 9
Ladymagic

rrKey Veteran

South Korea

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I only use the clear plastic align filters
I love Align filters and still use them on all my nitro machines for the same reasons as you.

But, yeah, I had Align T-filters installed when I had my engine headaches on my Evo50. I figured since they were clear I would see when the strainer was dirty. But, I was wrong and it cost me a lot of down time and a crap load of aggravation. In a final desperate attempt to fix the problem I opened the filters only to see the strainer was full of fuzzy gunk. Cleaned them and wouldn't you know it...problem solved.

Now I know never to assume anything is not the problem and everything is a potential suspect.

Mellisa

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