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Allis C Won't Start

B

bisenberger

New User
I got my Allis C back in running order. It ran good the first time out, nice and smooth for about 15 minutes. The second time it would run and then stumble like it was not getting a steady flow of gas. It set for about a week. I tired to start it. It cranked and cranked. Started and ran about 20 seconds then died. It won't start. It cranks until one cylinder fires and then kicks the starter out. I thought it was my needle and seat not shutting off. Fuel was dripping out o the bottom of the carburetor. I disassembled the carburetor and found grit in the inlet ahead of the needle and seat. I cleaned the carburetor and put a kit in it. I also added an inline fuel filter. Stills cranks but will not start. I check the plugs and they look dry.
Is there anything else to check
 
The tank outlet may be clogged with whatever got into the carb. I take a gas welding rod, poke it into the tank outlet hold from the top and feel for grit from rust and scale. You can break it up that
way then clean out the sediment bowl. Sediment bowl screen may also be clogged. If you look down the forum a couple of days, you'll see a thread on this that someone was having the same sort of
problem with.

A quick thing you can do is pull the bowl off the sediment bowl and see if you have a smooth flow. It has to be flowing unrestricted.
 
Most in line fuel filters on a gravity flow system cause more problems then they ever fix. That said try these things in order.
#1 check that you have a good blue/white spark at the center wire of the cap and at all 4 plug wires that will jump a 1/4 inch gap or more.
#2pull the carb drain plug and make sure you have a good steady flow of gas that will fill a pint jar in less then 3 minutes and yes catch it to look for water etc. If you do not have that flow work you way back to find the clog.
#3 when was the last time you serviced the air cleaner and dumped the water and mud out and filled with fresh oil
 
One other thing you might check is that your choke is adjusted properly in your carb. I have seen it where the choke plate is part closed when
you think it is open and the tractor runs good for a while and slowly floods itself out. If it has been flooded, sometimes new plugs are in order.
Does it smoke when running?
 
I will check the spark situation. Thanks for the info
I did a flow check today, but I just took the fuel line loose at the carb and dumped that into a measuring cup. I got a cup in 45 seconds. I don't know how much you need but that seem like it would suffice.
I also disassemble my air cleaner and removed all the wire mesh, cleaning those and reinstalling them with fresh oil in the cup as part of the clean up fix up process. I only have about 20 minutes run time on that since I cleaned it.
When I removed the carburetor the air intake side was wet, while the side to the manifold was dry. It seem I am getting fuel to the carb, but not through it, or it is not vaporizing the gas to go to the cylinders. Again my plugs were dry while I had gas dripping out of the hole in the bottom of the carb on the air cleaner side
If it was timing wouldn't my plugs be wet
I have also noted I have a crack in the housing where the fuel inlet fitting screws in. Other than leak gas, will that cause my problem?
 
Sounds like you have flow to the carb, but I wonder if you have gas through the carb. Did you use ethanol and leave it sit without running it for a month or more? I've had that clog several carbs.

Since spark is normally the problem people have, that is really worth checking. The way you described it at first made me think it was the fuel system, but by and large the majority of problems are ignition.
 
On the front bottom of the carburetor you either have a plug or and needle adjusting screw. Remove which ever you have and check the flow there. If you have a good flow remove the carburetor and remove the jet and clean behind the jet. Also remove the feeder tube in the neck of the carburetor and clean below it. Make sure all the holes in the feeder tube are open. Most home cleaning of a carburetor the area behind the power jet get missed. Make sure the gasket between the top and bottom has the air hole in it.
Gas gravity falls down before the power jet and is drawn thru the jet from vacuum caused by the air being drawn up thru the venture. What you are experiencing can be cause by forgetting to install the venture when cleaning the carburetor.
 
With the air cleaner hose unhooked from the carb hold your hand over the air intake and spin it over. You should get a good suction and also gas on your hand. It may even try to start when you do that. Poor suction or no gas on the hand means a vacuum leak in the manifold area and n gas means clogged passageways in the carb
 
I cranked my tractor with my hand over the throat with the air cleaner off. I got good suction and gas.
Prior to that I had very carefully set the float level and made sure it was set to spec. I actually lowered it almost a 1/4 of an inch.
After I cranked it with the air cleaner off gas dripped out the hold in the bottom of the carburetor. I turned the gas off and waited awhile. I turned the gas back on and gas started dripping out of the hole pretty good again.
That makes me think the needle is open. If the float level is correct, and I will check it again, are there any other ways to allow the gas to run through the carburetor like I have?
 
Turn the carburetor upside down and make it look like the drawing and no other measurement is necessary.
The dripping from the bottom means the float needle is not seating and shutting the fuel off. If no dirt is in the system from the tank to the carburetor to get between the seat and needle to hold it open you might need to tap on the needle to cause it to seat. You might just have a bad needle.


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