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Farmall & IHC Tractors Discussion Forum
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T9 Gas Engine Quit Now Coughs But Won't Run

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KSmith

06-15-2007 08:31:22




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I need some help, I have an older T9 gas powered dozer. It was running fine, has for a long time then just started sputtered for about 5 seconds like I was running out of gas (tank was near 1/2). I let it clear then shut it down. Thinking I was low on fuel. Fueled it up, now it coughs sometimes but won't run. I have checked the plugs, they were full of carbon and the wrong plugs to begin with. Replaced them, checked and cleaned all the mag points, drained and cleaned the carb the fuel tank and line filter, cleaned air intake, checked gov linkage, checked valve train. still will only cough. Manual hints carbon in the head. I really don't want to tear the head off, like I said it ran fine then just dropped. Can anyone help? I am stumped.

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KSmith

06-18-2007 05:40:43




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 Re: T9 Gas Engine Quit Now Coughs But Won't Run in reply to KSmith, 06-15-2007 08:31:22  
Thank you both for your help. I was getting good suction and spark as well as fuel to the cylinders. However, I picked up one of those in-line spark plug testers where you can watch the spark easier than holding the plug. Well the darn thing would spark for a while then quit then spark then a long pause. Note to self: check the most easy first. I disconnected the kill switch and the darn thing fired right up. I didn't even think about it. Needless to say she got a fuel system cleaning new plugs, points cleaning, air filter cleaning and some other misc fixin's. Thanks again!

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El Toro

06-15-2007 13:21:22




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 Re: T9 Gas Engine Quit Now Coughs But Won't Run in reply to KSmith, 06-15-2007 08:31:22  
Hold your hand over the throat of the carburetor and see if there's good suction on your hand while someone cranks over the engine. You need good intake manifold vacuum to pull that atomized fuel into the combustion chamber. Worn rings, cylinders and valves carboned up and not seating
will cause poor manifold vacuum. You may want to check the compression too. Hal



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Janicholson

06-15-2007 08:49:37




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 Re: T9 Gas Engine Quit Now Coughs But Won't Run in reply to KSmith, 06-15-2007 08:31:22  
Pull a sparkplug wire and position it 1/4" away from the block. crank the engine and watch the spark, If nice fat and blue, the timing may have been affected. If it is yellow and thin the mag needs help (possible condenser) check the timing as well if the issue persists. JimN



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