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Cockshutt 30 won't stay running

M

mylittlebigfarm

Member
I have a 1951 cockshutt 30. The motor has an all new electrical system and I cant get the motor to stay running. It has 120 pounds of compression on all 4 cylinders and spark at all 4. It will start and rev up and then it dies. It acts like its flooded because it won't start unless it sits a while. The carb has been cleaned and there is a good flow of gas out the bowl drain plug when its out. You can feel the suction of the motor if you put your hand over the airfilter hook up on the carb.
 
You need to check your ignition for a ballast resistor between the ignition switch and your coil. It may be defective. When the engine quits check for fire to your plugs asap when it quits. Hal
 
The package for the coil says Universal 12 volt coil without series resistance so I don't think it has a resistor. What does it matter if there is a resistor or there isn't?
 
That shouldn't hurt anything , but I would check your voltage at the coil with a volt meter.
With your points open and the the ignition switch in the run position see if there's battery on your plus terminal on the coil, should see 12 volts. Should see 6 volts on the neg terminal going to your points. If this voltage looks ok check it again asap when it quits by checking your neg terminal for voltage. The points need to be open. Should be around 6 volts. Hal
 
I am getting 12 volts on both sides for some reason. The points were open, the key was on, and I grounded the amp meter to the ground on the battery and on a bolt and touched the positive to both posts on the coil and they both had 12 volts. Is the coil faulty.
 
(quoted from post at 18:26:43 02/02/11) I have a 1951 cockshutt 30. The motor has an all new electrical system and I cant get the motor to stay running. It has 120 pounds of compression on all 4 cylinders and spark at all 4. It will start and rev up and then it dies. It acts like its flooded because it won't start unless it sits a while. The carb has been cleaned and there is a good flow of gas out the bowl drain plug when its out. You can feel the suction of the motor if you put your hand over the airfilter hook up on the carb.
Click to expand...

Just because you have good fuel flow through the drain plug doesn't mean you are getting fuel into the engine, and from the way you describe the problem, it sounds to me like the engine is simply starving from LACK of fuel. Get a good manual that includes an exploded view of the carburetor and then go to work on the carburetor again.
 
I have a good manual with an exploded veiw and I have cleaned it at least 4 times myself and I took it to an older gentlemen that restores tractors and he cleaned the carb too.
 
I forgot to mention that I converted to 12 volt system and put a 12v coil on. There are no resistors though does there need to be a resistor anywhere. Earlier you said the coil should have 12 volts on one side and 6 on the other side but thats not happening. Could that be the problem.
 
Did you check to see if it has 12 volts when the points are closed, and then check it to see if it has 12 volts when they're open? When the points are closed, there should be a drop in voltage, if the points are working. If not, you have vaulty points. If your points are burnt, it could be caused by no resistor.
 
When the points are closed the + post on the coil has 12 volts but the - post has .98 volts. Is it supposed to drop that much. I made sure all connections were good while testing it.
 
Yes it can. Then you have to wait a while for it to unload, then will start and run a little again. Make sure the wire isn't pinched, or grounded.
 
I tried a new condenser and nothing happened still. Would I still have spark if the condenser was loading up? Because I still have spark even after it dies.
 
try spraying starting fluid when engine begins to falter ,, if ir piks up and continues to run , you have a pluged jet in the carb ...
 
It started with gas in a spray bottle and the choke had to be on but as soon as the choke was off it would die. I couldn't even keep it running with the gas. Is it plugged or bad.
 
keep it choked and spray gas or ether in the breather,, if it continues to fire and attempts to run , you have good fire .../ i thin k the brass jet above the power jet is plugged ,, you may have plenty gas in the carb bowl , but it cant get fuel thru so it will starve out,, based on zenith carbs i am familiar with remove jet screw , , use a flat tip screwdriver and remove the tiny brass seat jet that is beyond the needle valve ,, i would bet there is crud plugging the jet
 
it is threded in same hole beneath the power jet adjust screw,and is mated to same . power jet comes out 1st , then brss
 
I cleaned every jet there was tonight and the same outcome. I know there is nothing plugged. It still dies as soon as the choke is off even if u are spraying gas in the carb. What would cause it just to stop running when the choke is off. Its almost like it just quits drawing but it still makes a sucking noise.
 
keep that choke on ok ,,, Will it keep running with choke pulled while spraying gas or ether ????,,, if it does keep runnin, more than likely you don't have electric spark problem .. then as frustrating as this may feel you have a fuel jet blocked SOMEWHERE , and the brass jet seat is often overlooked ,,were you able to locate it ?
 
Yes I used my manual and found all the jets and passages. When I was done all the holes light could shine through and there wasn't any more dirt anywhere. What do you mean by the jet seat.
 
I assume the tractor was running fine before all electrical work?

You have compression, you have spark, and it appears you have fuel. Have you checked the timing? After it starts and quits, have you pulled a spark plug to see if it's wet?

I have the feeling we're overlooking something simple. Is the rotor on right and seated?
 
perhaps you dont have one on your particulr model,,.if you are certain you have correct parts blowup diagram and all orifices are clear ,, then it ought to run ,, fuel +air +spark present ,, it ought to run
 
The rotor is on right and is seated. The timing is fine. Everything checks out to be just fine. I can't figure it out. I cleaned it again and all the holes were still open but when I put it back together the well vent which looks like a jet was overflowing right out the carb. The manual calls it a well vent. Not sure what it does but anyhow I shut the gas off and turned it back on and it quit. Is there something wrong with that. Could valves not being properly set cause it to run fine with a spray bottle of gas and not without the gas.
 
you got a carburator problem ,souind like the needle float valve is not closing try opening the gas just a little for run results and report back ...
 
It quit overflowing and I put like three carbs together to make one good one and the same outcome. So I think I'm going to set the valves and try that.
 
How do you check for a leak on any of these spots. I don't think the manifold or the manifold hook up is leaking because if you spray gas in the carb it runs good.
 
I took it to get worked on and the mechanic was able to get it to idle and rev up about 1/4 of the way up but then it just pukes out and dies. What could be causing this.
 
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