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Model Forum / Radio Controlled / Air Models / May 2004Help with OS 46 FX needed
I have a low time OS 46 FX (about 1/2 gallon through it) I have had since new. After the using for the last time last year, it was run dry of fuel, after run oil put in and stored in a dry location. The engine HAD BEEN running last year with the main needle open 2 1/2 - 2 3/4 turns. Low end has not been touched since it was set. The engine is now in a new plane mounted sideways. Problem: It will not run beyond the prime. I have done/checked the following and am at a loss on where to go from here. New OS #8 plug (verified the plug is good - All coils, except the top 1/2 are lit and bright) Fuel is getting to the carb Fuel is fresh (Jug was opened yesterday and put on the field box) Fuel tank/carb height is correct Compression is excellent Made sure the main needle valve has no junk/crud in it. (Removed and cleaned the needle valve, blew out the housing and visually verified the housing is clear and there are no burrs or anything on the needle valve.) Replaced ALL the fuel lines, including the tank lines and made sure they were tight Made sure the clunk was clear and free moving (tank is new) Pressure tested the tank, everything is tight - no leaks There are no kinks in the lines Used the power panel with the voltage set a 3 volts for the glo plug. Tried various main needle valve settings up to and including 4 1/2 turns - no difference The engine primes easily. It runs out the prime, then quits. Any ideas on where to go from here ? It SHOULD run, but it isn't. The engine ran great before I put it away last year. May sound dumb but do you have the correct fuel lines going to the carb and muffler? Been there, done that...  SignatureFubar of The HillPeople AMA605992 KE6ERB http://www.fubar1.net "I've heard the screams of the vegetables." > I have a low time OS 46 FX (about 1/2 gallon through it) I have had > since new. After the using for the last time last year, it was run dry [quoted text clipped - 28 lines] > on where to go from here ? It SHOULD run, but it isn't. The engine ran > great before I put it away last year. >May sound dumb but do you have the correct fuel lines going to the carb and >muffler? >Been there, done that... That's why I started colors for all my planes Blue for fuel, pink for pressure... Good luck, something is keeping it from getting a supply of fuel. Make sure you don't have the lines reversed. Andy We can make a box of wood.....FLY!! On 5/12/2004 8:58 PM Ted shuffled out of his cave and grunted these great (and sometimes not so great) words of knowledge: Yep. I use different color lines so I can MINIMIZE that problem. :) > May sound dumb but do you have the correct fuel lines going to the carb and > muffler? > Been there, done that... Had similar to this once. Turned out to be the cavity that surrounds the needle valve was gunked up. Where the fuel line connects to the nipple then fuel goes into cavity that surroundes the needle, this cavity was partly blocked. You can take the needle out and all looks clear, used a piece of nylon fishing line with hook bent on end to clear. My twopence worth. V ///////////// > I have a low time OS 46 FX (about 1/2 gallon through it) I have had > since new. After the using for the last time last year, it was run dry [quoted text clipped - 28 lines] > on where to go from here ? It SHOULD run, but it isn't. The engine ran > great before I put it away last year. >Had similar to this once. >Turned out to be the cavity that surrounds the needle valve was gunked [quoted text clipped - 4 lines] >fishing line with hook bent on end to clear. >My twopence worth. A Butler brand dental 'Proxabrush' works pretty well for that, too. Cheers, Fred McClellan The House Of Balsa Dust home.mindspring.com/~the-plumber Are you starting the engine at a low throttle setting or at 1/2 or greater throttle? The main needle only controls fuel flow at 1/2 throttle or higher. You may need to clean out the low speed needle area. -- Paul McIntosh http://www.rc-bearings.com > I have a low time OS 46 FX (about 1/2 gallon through it) I have had > since new. After the using for the last time last year, it was run dry [quoted text clipped - 28 lines] > on where to go from here ? It SHOULD run, but it isn't. The engine ran > great before I put it away last year. Hey Ted, here is my two-cents worth;) I have 4 OS.46's running right now, and the needle valve setting vary from 3/4 to 1 1/4 turn open. I believe this varies due to the brass hole the needle screws into. Good luck Frank > I have a low time OS 46 FX (about 1/2 gallon through it) I have had > since new. After the using for the last time last year, it was run dry [quoted text clipped - 28 lines] > on where to go from here ? It SHOULD run, but it isn't. The engine ran > great before I put it away last year. Ted, If you haven't found the problem by now, try checking the muffler pressure fitting. Sometimes crud gets in the hole and plugs it. An easy check is to put a finger over the muffler outlet and flip the prop, watching for fuel traveling in the "in" carb line. Might have to flip several times to establish pressure in the tank. No glow driver attached, of course. Happy Flying, Mike > Hey Ted, here is my two-cents worth;) I have 4 OS.46's running right now, > and the needle valve setting vary from 3/4 to 1 1/4 turn open. I believe [quoted text clipped - 36 lines] > > on where to go from here ? It SHOULD run, but it isn't. The engine ran > > great before I put it away last year. Mmmm, there is something wrong here because all the motors I know of (incl my OS46 FX) run with about 3/4 to 1 or max 1.5 turns of the needle valve open when using muffler pressure. Only if you take the muffler pressure off do you need to open the needle that far. I would check that the pressure vent in the muffler is not plugged and that there is not a kink in the pressure line. I would also check that the pressure feed piece of brass tubing is not jammed up against the top of the tank. I generally file a V groove in the top of that piece of brass so that it cannot become blocked. Failing all this and the other help you get, pull the motor and check it on the bench. There is nothing more frustrating than trying to fix a motor problem in the 'plane when you do not even know if it runs ok on the bench. Gord Schindler MAAC6694 > I have a low time OS 46 FX (about 1/2 gallon through it) I have had > since new. After the using for the last time last year, it was run dry [quoted text clipped - 28 lines] > on where to go from here ? It SHOULD run, but it isn't. The engine ran > great before I put it away last year. Ted, I replaced the carb on an engine about a week ago and had the same symptoms you are describing until I finally got the LOW end needle valve open far enough. My engine is side mounted too... Don't know if the side mounting is relevant but I'd open it a turn or two (yes, I know they are supposed to be minor adjustments but you can always close it back up once the engine is running at the low end at all) and try again. Of course it could be that the low end valve is gunked up so cleaning it out might help. Good luck and let us know what happens. Jack > I have a low time OS 46 FX (about 1/2 gallon through it) I have had > since new. After the using for the last time last year, it was run dry [quoted text clipped - 28 lines] > on where to go from here ? It SHOULD run, but it isn't. The engine ran > great before I put it away last year. |
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