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8N won't start

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matt

07-24-2004 13:35:16

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Gentleman, hopefully one of you guys can help me. I have a ford 8n 49? that I have been trying to get running all summer. I wore out the starter trying to get it running and had to have it rebuilt. New points, new plugs,have spark. I took off the intake and tried with starting fluid but it would not start. I tried pull starting it and it sounds like it might start but never did. the carb is clean, I get smoke out of the exhaust but it won't start. I don't think the plugs are getting gas. When I try to start it I get gas out of the backflow drain hole in the carb. Do I need to take of the exhaust manifold to see if there is some sort of obstruction? Could it be that the motor is ceased? It ran fine last year. Any thoughts?

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Mark Rodberg

07-25-2004 06:41:36

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Re: 8N won't start in reply to matt, 07-24-2004 13:35:16

One thing that can happen is The Engine became flooded and the excess gasoline wiped the oil from the sides of the cylinder walls--resulting in no compression --the engine will crank but not start--To fix this --remove all spark plugs and pour a little oil directly onto the pistons (table spoon or two in each) spin the engine over to spread out the oil --this should restore the oil film to the walls of the cylinders and also the rings replace new spark plugs --go

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DJ in Pa.

07-25-2004 05:07:59

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Re: 8N won't start in reply to matt, 07-24-2004 13:35:16

If it ran fine last year, you can rule out major internal problems. the law of gas engines is - IF IT HAS GAS AND HAS SPARK IT WILL RUN.
are the spark plugs wet with gas after cranking? they should be if it is getting fuel. If you know any body who is a mechanic they will be able to solve your problem in 5 minutes.pay them ten bucks for their time and it will be money well spent. Good luck.

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Ron

07-25-2004 06:07:30

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Re: Re: 8N won't start in reply to DJ in Pa., 07-25-2004 05:07:59

If you know of any mechanic that works for $10 good for you! Around here it's $75/hour from the time they leave their shop until the time they get back.

I disagree about the "two things".

They need four things...

1) Compression
2) Timed valve train
3) Timed & strong ignition
4) Proper gas/air mix

I'd do just like you said, look for wet plugs. If they are, I'd first suspect the ignition system. A fat spark outside the engine is meaningless; a weak ignition system (coil, condenser) can fail when under compression. I use a spaek plug tester to see if the plugs actually fire in the cylinder. Next step is to remove the valve cover to check valve operation or do a compression test; either will verify/deny proper valve train operation. I wouldn't discount the fact it ran last year but parts do break... a broken cam or timing chain can cause exactly the symptoms he's having. If the plugs are dry, it's obvious where the problem is.

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Jerry/MT

07-24-2004 18:17:44

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Re: 8N won't start in reply to matt, 07-24-2004 13:35:16

Don't know what the "backflow drain hole" is, but your tractor has three filters; one in the tank , one above the sediment bowl, and the "secret filter" in the fuel inlet elbow at the carbretor. With the gas valve full open, remove the plug at the bottom of the carburetor. Fuel should pour out like a cow peein' on a flat rock. If'n it doesn't, you need to go back through the fuel supply circuit and find out what is plugged up.If it does have plenty of fuel, you'll need to check the float setting by removing the carb, but check the aircleaner and ignition system before you remove the carb. While you're at it try to start it with the air supply tube from the air cleaner disconnected so you don't tty to draw air through you air cleaner. If it starts, your air cleaner is overly restricted and needs to be cleaned.
You said you have spark. Is it a nice fat bluish white spark? Ifn' it ain't, then you need to make sure your ignition system is good. Make sure all the connections between the battery, through the key swich to the coil are clean, bright and tight. Make sure you have battery voltage on both sides of the key switch with the key in the on position. If you don't replace the key switch. Make sure you have the correct voltage at the coil when the points are closed.Check your point setting again. Report back on what you find.

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nebraska cowman

07-24-2004 16:23:23

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Re: 8N won't start in reply to matt, 07-24-2004 13:35:16

I would start by checking if the timing is set to fire when the #1 piston is on top dead center, the points should be just starting to open. Then verify that the plug wires are on in the right order.

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matt

07-24-2004 17:02:27

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Re: Re: 8N won't start in reply to nebraska cowman, 07-24-2004 16:23:23

I'm pretty sure the plug wires are in the right order. Not quite sure how to check the #1 piston with respect to the timing. Is that hard to do?

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nebraska cowman

07-24-2004 17:41:05

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Re: Re: Re: 8N won't start in reply to matt, 07-24-2004 17:02:27

not hard at all....
Take out the #1 spark plug, (thats the one at the front of the motor) Turn the motor over slowly with the hand crank, (helps to have a friend) while holding your thumb or finger over the spark plug hole. When the piston comes up on compression stroke you will start to feel air pressure. then use a screwdriver or piece of wire or something to determine when the piston reaches it's highest point. That is "top dead center" that is when the points should be just starting to open and which ever hole in the distributer cap the roter is pointing to will be for that plug wire.

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Steve Mahler

07-26-2004 06:42:04

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Re: Re: Re: Re: 8N won't start in reply to nebraska cowman, 07-24-2004 17:41:05

If you shoot starter fluid (ether) into the air intake and it doesnt fire, stop wasting you time dragging it around the lot. You have no spark. Start from the battery, test and replace all the electrical bits right to the spark plugs. Half of the 'carb' problems are 'spark' problems on N tractors.

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