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1949 8N will not start

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Sasquatch

09-03-2006 18:20:51




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I got this tractor about 2 weeks ago, it quit running about 2.5 years ago and has been sitting since. Previous owner could not get it to run. I changed the oil and hyd fluid, installed new battery, plugs, coil, cap, rotor, points, and condensor. I timed it the way the I&T manual shows. I rebuilt the carb and put fresh gas in it. Spark test shows it is firing. Pulled eack plug and put a little gas in each cylinder. Sometimes it will crank a little faster when the choke is on like it is trying to start then when you open the choke a little gas runs out. Pulled the carb and re-cleaned all passages and made sure the float level is correct. The carb has a crack in the bowl between the bowl drain and the main jet drain plug but no gas is leaking out. One of the ears was partially broken off of the distributor but a flat washer on the bolt is holding ok. As a last resort, I even tried starting fluid. It will not start. I am out of ideas.

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Sasquatch

09-07-2006 19:11:03




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 Re: 1949 8N will not start in reply to Sasquatch, 09-03-2006 18:20:51  
It lives! 4 days after pouring the MMO in the combustion chamber, I checked the compression again and it started changing. Some were better and some were worse. To see if it was rings or what, I poured some oil (Castrol 5w50 synthetic for the detail oriented ones) in the combustion chamber and cranked it to spread it around and work it in. The compression started coming up, I had one up to 80#. I put the plugs in it and ethered it and that one cylinder started firing. I pulled the now oil-fouled plugs and cleaned them, put them back in and ethered and it fired up and proceeded to kill every mosquito in the vicinity. After the smoke cleared, I started driving it around in the yard and on the road in front of the house. It runs good, power is good even in road gear. The next step is to fix the exhaust manifold leak at #4, then clean it up and start on the axle seals and brakes. Thanks Bruce for steering me in the right direction.

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Sasquatch

09-04-2006 18:47:48




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 Re: 1949 8N will not start in reply to Sasquatch, 09-03-2006 18:20:51  
Bruce: Thanks for you reply. Both versions of your "50 tips" are quite interesting. The bubba test shows very little suction, went ahead and pulled the plugs and did a compresson test. After 10 strokes instead of the customary 4 strokes (throttle wide open and all 4 plugs removed), #1 has 50#, #2 has 31#, #3 has 60#, and #4 has 28#. The MMO is soaking in, will check it in a day of so (wet test) and see if it comes up. If it"s still low, it looks like it"s time to pull the head unless somebody has any more ideas. I don"t know if it has aluminum or cast-iron pistons, serial number is 183692.

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Bruce (VA)

09-03-2006 18:31:57




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 Re: 1949 8N will not start in reply to Sasquatch, 09-03-2006 18:20:51  
No need to put gas in the cylinders; it fouls the plugs. If you get gas running out of the carb, you have flooded it for sure. Remove the plugs, wash them in dish soap & put them back. Get an old plug & ground it to a clean spot on the block. Turn the key on, and look for a bright blue spark. If it's nice & blue, you have spark. Remove the breather & crank the engine; put your hand over the carb throat. That is called a Bubba compression check; it should suck your hand in the carb. If so, it has a little compression. Then, try the starting fluid. If that doesn't work, you should do a real compression check; I would not be surprised if it has a stuck valve or rings after setting that long. Did you soak the cylinders in MMO or tranny fluid before you turned it over?

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