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Tractor Talk Discussion Forum

Re: Marvel Schebler - Idle Problem TSX-120 (Oliver

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Jerry/MT

05-27-2006 20:46:33




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The welding tip cleaners that I'm aware of are like little files. You are not supposed to clean out the passages with anything but compressed air and solvents. Some folks used monofillament fishing line. Some of the passages are drilled as an orifice and using an object like a welding tip cleaner can change the orifice size and effective area. Hopefully you didn't ream out anything critical in the pasages. Blow through the passages with compressed air or a pressurized spray can of carb cleaner to make sure they are clear.
A lot of ignition caused problems get blamed on the carburetor so I usually recommend checking the ignition first to make sure that isn;t your proble,? Do you have good spark and correct timing?
What was the level of vacuum you measured and was it pretty steady? How sure are you that you don't have any air leaks around the carburetor metering section? For example, throttle shaft leakage, carb to intake manifold connect flange air leakage, or intake manifold to head air leakage, etc. These can lean out your mixture so bad that you have to choke the the carb to get it to run. If you use some hand choke does it get any better? If it does, using ether or an unlit propane torch CAREFULLY spray it around the above mentioned locations and if your speed increases, you've found the leak.
Finally,does your governor have an adjustment on it? Some times they have a "damping screw" that puts a little preload on the governor system to prevent hunting at low speed.
That's all I can think of for now. Hope it helps.

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Bob

05-27-2006 21:28:33




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 Re: Marvel Schebler - Idle Problem TSX-120 (Oliver in reply to Jerry/MT, 05-27-2006 20:46:33  
Jerry,

There are passages drilled in the cast iron that get so severely clogged a small drill is likely needed to clean them, and there is no harm in that, as long as the brass jets are not drilled out and harmed.



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Woo

05-27-2006 21:09:44




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 Re: Marvel Schebler - Idle Problem TSX-120 (Oliver in reply to Jerry/MT, 05-27-2006 20:46:33  
Thanks for the suggestions Jerry.

I only used the non-serrated portion of the welding tip cleaners. I didn't poke anything through the brass parts. Verified all passages clear using aerosol carb cleaner and compressed air. Took my time, several hours. Hard to believe I missed something, but I won't rule out that possibility.

Regarding the ignition system, it has new points and was static timmed, and then checked with a light. The plug wires are not solid or stranded. They are the resistor type, but I find it hard to belive they could be causing all the problem. The spark plugs are Champion D21's. New six hours ago. Sparking at each plug when wires are gapped.

Also with governor disconnected it dies. So I think that rules out governor rigging,

Good suction with hand over carb. Sprayed lighter fluid around manifold to check for leaks.

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Jerry/MT

05-28-2006 21:01:31




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 Re: Marvel Schebler - Idle Problem TSX-120 (Oliver in reply to Woo, 05-27-2006 21:09:44  
"With the governor disconnected from the carb it dies...." I'm not familiar with your governor linkage but were you holding the carb throttle shaft against the idle stop

Make sure that you didn't miss the pressure balance port in the area of the choke. It's a drilled hole or slot and it vents the fuel bowl to the carb inlet so the air cleaner restriction won't affect the metering system. If it's plugged, your idle port will pull some fuel out and the pressure in the fuel bowl will fall and reduce the fuel flow.

ALso, pull a plug wire and see if you have fat bluish spark. That's about all I have to offer.

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Dell (WA)

05-27-2006 23:11:59




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 Re: Marvel Schebler - Idle Problem TSX-120 (Oliver in reply to Woo, 05-27-2006 21:09:44  
Woo..... ...DO NOT USE modern resistorized anti-radio static carbon core sparkplug wires. Use COPPER-CORE sparkie wires. Your ignition system ain't gott enuff sparkie power to overcome the resistance and will cause misses and all sorts of runtime issues. New COPPER-CORE cut-to-fit sparkie wire kits $15 (cheap)..... ....Dell, yer self-appointed sparkie-meister



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Glen in TX

05-27-2006 22:04:45




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 Re: Marvel Schebler - Idle Problem TSX-120 (Oliver in reply to Woo, 05-27-2006 21:09:44  
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I agree with Bob that you may have missed a passageway someplace? Clean bowl and top mating surfaces well with steel wool seeing if you don't find a new plugged hole to clean out. If you are running those carbon core wires with a magneto get rid of them now! Okay on a battery dist. ignition but you will get more fire with metallic core wires. The hunting just sounds like carb problem to me yet. Make sure the new needle seat is sealing off good and float isn't bad or hanging up. New TSX floats can be had for a reasonable price and if float looks collapsed some replace it.

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Woo

05-28-2006 22:17:40




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 Re: Marvel Schebler - Idle Problem TSX-120 (Oliver in reply to Glen in TX, 05-27-2006 22:04:45  
Thanks Glen,

I'm running the resistor wires with a distributor. I don't think they're the problem, but I'm going to replace them with metal wire anyway. Spark is good 3/8 to 1/2 inch jump.



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