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8N won't start with starter

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Andy-WI

11-24-2007 16:16:46




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I have a 1952 8N tractor that is very strange. It will only start if you pull it, and then it runs pretty good, has good power. But it will not start off the starter. It seems to have a good spark, when I pull a spark plug and check it. I've just rebuilt the carburetor and it didn't seem to help. Although it seems to not be getting gas, as the plugs are dry when I check them. But gas runs out the bottom of the carb. Doesn't seem to be getting a good air/fuel mixture into the combustion chamber unless you pull it in high gear. It turns over pretty good with the starter too, as I have tried it with the battery charger connected and it spins over pretty well. Makes no difference if it's cold or been running awhile, still won't start.

Anybody ever have one like this? Are these tractors normally hard starting? Any thoughts welcome. It has me stumped?

Thanks,
Andy

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soundguy

11-24-2007 21:26:37




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 Re: 8N won't start with starter in reply to Andy-WI, 11-24-2007 16:16:46  
Sounds like compression issues to me.. ( lack of.. )

Soundguy



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Den N Ms

11-24-2007 18:51:55




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 Re: 8N won't start with starter in reply to Andy-WI, 11-24-2007 16:16:46  
Check first if you have no vacuum at the carb inlet when cranking over,next check Check your compression , you should have 80-120 psi on all four.if less you have bad valves or rings.I'm guessing worn or burnt valves.add a teaspoon of motor oil in each spark plug hole and and take compression reading again if it was low the first time and see if it gets higher after adding the oil. Also check your spark when cranking it over with the plugs out.

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Peter, Covington, LA

11-24-2007 18:28:42




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 Re: 8N won't start with starter in reply to Andy-WI, 11-24-2007 16:16:46  
My first thought was one or more leaks where the intake manifold meets the block. Try this - when you have it running by whatever means, use WD40 or starting ether, and spray all around the connection mentioned. Also try the carb-to-manifold connection. If there's a leak, vacuum will draw the material in, and you'll hear a difference in the RPM's and if you use WD40 you'll see some smoke out the tailpipe.

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old

11-24-2007 17:30:58




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 Re: 8N won't start with starter in reply to Andy-WI, 11-24-2007 16:16:46  
Could be one of a few problems. Weak starter drawing to many amps and takes power from the ignition. Have the starker check at a auto parts store/repair place. Or you could have low compression which would cause the no gas problem and pulling it spins it fast enough to over come the low compression problem. Check you compression. Carb may not be set right and or clogged up and your not getting enough gas to the plugs As far as being hard starting nope most if in good shape will start before you can take your hand off the button. Another problem you might have is a bad or loose wire some place of dirty connections

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Andy-WI

11-24-2007 17:44:38




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 Re: 8N won't start with starter in reply to old, 11-24-2007 17:30:58  
How much compression should these motor have? What readings should get? I know they are not high compression to begin with. Only around 8:1 compression. I think I will check it and see what it is.

Andy



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old

11-24-2007 19:07:15




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 Re: 8N won't start with starter in reply to Andy-WI, 11-24-2007 17:44:38  
As Bruce says any thing less then 90 PSI shows a weak engine. Yes they will run with less but not as well as if they have 90plus



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Bruce (VA)

11-24-2007 19:02:36




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 Re: 8N won't start with starter in reply to Andy-WI, 11-24-2007 17:44:38  
Is the tractor 6v or 12v?

Anything less than 90 lbs compression or a 10% variance between cylinders is suspect. If gas is pouring out of the mouth of the carb, you've flooded it. Don't give it so much choke & change the plugs. Like others have said, you have a weak spark because the starter is drawing to much current or you have a vacuum leak. Try jumping it from a 12v battery & see if it starts then. Tip # 43, below, will tell you how to do that safely.

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Tool Kat

11-24-2007 17:02:51




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 Re: 8N won't start with starter in reply to Andy-WI, 11-24-2007 16:16:46  
You have high resistance in your primary circut. When you crank with the starter, the draw causes no spark at plugs. When you pull start it, there is no draw, so all power goes to ignition, overcoming the resistance, and motor starts. Make sure all connectins to coil and igniton switch are clean bright and tight. You might try a new ignition switch, too
Tool Kat



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RP-40-9n

11-24-2007 16:34:08




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 Re: 8N won't start with starter in reply to Andy-WI, 11-24-2007 16:16:46  
andy, sounds like you might have a air flow problem. pull the breather pipe from back of carb and hold your hand over the hole and hit the starter-do you get a strong suction? if not, you could have a stopped up exhaust or a blown gasket-carb to manifold or manifold to motor. if you do have a strong suction on your hand, then i would take the air cleaner apart and clean it out good. yes they are good starting unless there is a problem. RP

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Andy-WI

11-24-2007 17:27:46




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 Re: 8N won't start with starter in reply to RP-40-9n, 11-24-2007 16:34:08  
I think the timing is good, because it wouldn't start at all if not. It does fire at the plugs when turning it over with starter. It has a new carb. to manifold gasket, but maybe the manifold to head gasket could be bad.

That's a good idea about holding my hand over the carb and turning it over. I will try that tomorrow. I'm beginning to think the vacuum or suction into the motor is bad in some way. I don't know these tractors that well, but I'm learning.

Andy

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RyaninKS

11-24-2007 16:30:25




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 Re: 8N won't start with starter in reply to Andy-WI, 11-24-2007 16:16:46  
sounds like a timing issue to me



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