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Ford 9N, 2N & 8N Discussion Forum
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9N Engine Problems

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Roger 9N

09-01-2005 08:33:48




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Okay, I need some help. Got my started fixed and now the engine turns over but will not start. Pulled each plug, and cylinders 1 and 3 have no pressure. Cylinders 2 and 4 seem to have good pressure. The tractor sat up for quite a while. Where should I start ? New rings ?

Thanks for the help




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old

09-01-2005 09:05:32




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 Re: 9N Engine Problems in reply to Roger 9N, 09-01-2005 08:33:48  
I'd fill all cylinders with tranny fluid and let it sit a few days. Then check the compression again. It could be stuck rings and or valves. The tranny fluid will help with either but may not work depending on which valve is stuck if its a valve. I have an 8N that had the same problem and I ended up pulling the head and the vavle covers to fix the problem. It had stuck rings and stuck/miss adjusted valves.

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Dan

09-01-2005 08:40:40




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 Re: 9N Engine Problems in reply to Roger 9N, 09-01-2005 08:33:48  
Sounds like stuck valves to me - a dry/wet compression test could verify that. Remove your manifold and carb, then remove the two rectangular plates on the side of the engine, then clean the valves good with Marvels Mystery Oil and an old toothbrush. Turn the tractor over and ensure they are all moving up and down smoothly before you put it all back together.

Good luck,
Dan



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gahorN

09-01-2005 12:42:10




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 Re: 9N Engine Problems in reply to Dan, 09-01-2005 08:40:40  
The way we check airplanes can be done to other engines and is a good method to use. Put the cylinder on top dead center and put compressed air into the cylinder thru the spark plug hole. (Use an adaptor available at the CarQuest or NAPA which screws into the spark plug hole, or make your own by drilling out an old spark plug and braze a Milton/compressed air fitting onto it. When you put air into the cylinder and listen at the carb and hear air...it's a stuck/burned intake valve. HIssing at the exhaust...it's the exhaust valve. Hissing at the crankcase filler tube...it's stuck/broken rings. HIssing at an adjacent spark plug hole....blown head gasket. With airplanes we use a special gauge setup that measures differential pressure. We put a regulated 80 psi into the cylinder and a second gauge measures the leak rate. But that's not necessary with the tractor. Just put about 50 or 60 psi in there and listen.

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