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8N carb problems

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Greg Watkins

09-26-2002 05:33:07




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After much reading here, I decided to rebuild my carb on my 1950 8N. I got the kit and did the rebuild. Replaced everything except the main jet as I couldn't get that out. It is clear though as I could shoot brake cleaner through it. My tractor is still experiencing problems though. I "think" it is fuel flow related (after more reading here that is :~>)The problem is the tractor will start and run for about 15 seconds. Then it will not start again for a few minutes. I have disconnected the fuel line at the carb and the fuel just drips out. I have opened the gas cap while this is happening and it does not change the fuel flow. I took out the shut off valve and the filters are clean, but there is still not much flow. Any other ideas?

BTW, IF I leave the fuel shut off open, the carb will get full by the next morning and is leaking out of the air intake of the carb. Of course the tractor will start at this time also and run for about 10 or 15 seconds :~>

Thanks for your time,

greg

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Dave OH

09-26-2002 11:48:41




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 Re: 8N carb problems in reply to Greg Watkins, 09-26-2002 05:33:07  
Well "bg" told you where the three filters are and that is one problem. The second is why is the carb leaking when the bowl is filled? Could be a gasket, as I am not there to see it, but also it could be that the float in the carb is not seating properly and allowing the fuel to over fill. Next problem is when you get it running, I hope you did not "bugger" up the main jet seat trying to get it out. You cannot use a screw driver "which is tapered" to remove it. I hope things work out for you.
Dave OH

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dave#1

09-27-2002 04:30:14




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 Re: Re: 8N carb problems in reply to Dave OH, 09-26-2002 11:48:41  
I hope you did not "bugger" up the main jet seat trying to get it out.You cannot use a screw driver "which is tapered" to remove it

That's kind'a like saying "You can't build a flat deck because the world is round!

The taper of a flat bladed screw driver is to slight to be of any concern ! The point that should be made- Use a screw driver that is the correct size and that has a good "Tip", make sure your screw driver is square in the jet and use lots of down force to "Crack" it loose.
I've R$R'd zillions of jets this way with no problems what so ever.

later,dave

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Dave OH

09-27-2002 14:19:57




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 Re: Re: Re: 8N carb problems in reply to dave#1, 09-27-2002 04:30:14  
I'm glad you have been able to do it, even though the slots in the jet are not tapered. I just use the proper tool as I was taught. Or in a pinch a hollow ground screw driver blade of the proper size. To each their own. But he couldn't get the jet out could he?
Dave OH



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dave#1

09-27-2002 16:41:09




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 Re: Re: Re: Re: 8N carb problems in reply to Dave OH, 09-27-2002 14:19:57  
So right off the bat you say it's cause he used the wrong "Screw driver blade????

If you have a stuck "brass" jet, you'll shear the head off no matter what screw driver your useing.

later,dave



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Dell (WA)

09-26-2002 06:12:59




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 Re: 8N carb problems in reply to Greg Watkins, 09-26-2002 05:33:07  
Greg..... .....I agree, you have a fuel flow problem since you claim a drip in the fuel line end at the carb elbow, it should flow like an old man taking a pee.

I don't know about the running for 15 seconds issue though, it takes my N about 3 minutes at idle to empty the carb and die and about 1 minute at 1/2 throttle to die.

Since you claim clear fuel bowl filter, did you clear the round tube filter inside the fuel tank? Did you clear the inside the fuel tank tubes to the fuel valve? Did you comletely dissassemble your fuel valve and check the fuel knob tapered needle and seat?

If all these fuel valve related issues pass inspection, it suggests to me that your fuelline is clogged somehow, somewhere. Start with a blow-out. Then if metal, a crimp somewheres? If rubber, don't muckka round, replace it with good fuel hose..... .....Dell

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Patrick (Sussex, NJ)

09-26-2002 06:03:28




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 Re: 8N carb problems in reply to Greg Watkins, 09-26-2002 05:33:07  
Did you replace the gasket on the fuel bowl? If not, check it because on my 50 8N, the original leather gasket had stretched/deteriorated and was covering a portion of the hole into the fuel tank and severely restricting the fuel flow.



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two to go==bj/8n/mt

09-26-2002 06:00:57




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 Re: 8N carb problems in reply to Greg Watkins, 09-26-2002 05:33:07  
Tractor left the dealer with three fuel filters. One on top of the glass bowl; one in the carb elbow; and one on top of the shut off inside the tank. Sounds like the one on top of the shut off inside the tank is your trouble. No good way to clean it without draining the tank and pulling the shutoff. Don't be surprised at what you find since lots of mystery crud has had fifty or more years to migrate into the gas tank.

Your mileage may vary

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