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Low compression

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Rocky

12-31-2000 21:38:16




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What is the specs for compression on the N tractors? I finally got a compression tester and found that my 8N had a reading between 60 - 70 dry and wet. I think I've seen other posts of 95 - 115. Even if this is low, shouldn't it still start if everything else is right?
Rocky




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Dell (WA)

12-31-2000 23:40:47




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 Re: Low compression in reply to Rocky, 12-31-2000 21:38:16  
Rocky..... ..Ford specs 90 psi compression. Assuming that is the result of 5-10 puffs (cranks) thats awfull low but uniform. Its possible that you have "sticky" valves that are slow in closing. If you haven't run the tractor engine for quite some time, you might want to open up the valve covers and wash and scrub everything with some Marvel Mystery Oil. But then on the otherhand, How does the engine perform, burn lotts of oil???? Got plenty of power??? Enquiring minds want to know so they can be more helpful..... .Dell

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Fast Ed Ohio

01-01-2001 09:49:53




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 Re: Re: Low compression in reply to Dell (WA), 12-31-2000 23:40:47  
Rocky, I would go with Dell,s thing about cleaning crud from around valves. Your carb. scould be sucking in air, not blowing out, This sounds like a sticky valve problem.



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Rocky

01-01-2001 08:21:13




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 Re: Re: Low compression in reply to Dell (WA), 12-31-2000 23:40:47  
actually that's why I checked compression, it doesn't start. When it was running it didn't seem to burn much oil, does drip a little though. No, it didn't seem to have as much power as I thought it should have either. I've only had it for a little over a year and I don't use it everyday. Last time it was running was early fall. Since cold weather has been here it hasn't started.
Rocky



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Fast Ed Ohio

12-31-2000 22:46:31




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 Re: Low compression in reply to Rocky, 12-31-2000 21:38:16  
Rocky, More information is needed , why are you running compression test? When is the last time it ran ? How bad did it run? Did you just purchase it? I also question low readings on your gauge, these readings are quite low but rather consistant, which leads me to question how acc urate your gauge is.



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Rocky

01-01-2001 08:33:56




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 Re: Re: Low compression in reply to Fast Ed Ohio, 12-31-2000 22:46:31  
I'm running comp test because it hasn't started since cold weather set in. Not a ton of power when it was running, also hydralics would get slower as I would use it, But that's another story. I've owned it for about a year, it was hard to start this summer so I did a tunup on it. Plugs, Points condenser, cap, coil, igntion switch, reistor, carb rebuild. I've got the intake tube onthe carb off, when I turn it over it actually blows gas out the carb. When I stop turning it over gas runs out of the carb for a little while then stops. It will pop and sometimes make me think it might actually start, but only if it's fully choked. I know this is tough to diagnose over the net, but I really appretiate any input.
Rocky

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Bill Stanley(NC)

01-02-2001 10:43:21




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 Re: Re: Re: Low compression in reply to Rocky, 01-01-2001 08:33:56  
<< carb rebuild. << When I stop turning it over gas runs out of the carb for a little while then stops.

If your float is set correctly and the needle and seat is good and gas is still overflowing you might want to consider the float.

Replaced the float for about $8 and it has not leaked since. The float was slightly collapsed due to water in the carburetor freezing sometime in its long life. Parts man immediately recognized the problem. Please note the float was only slightly collapsed and fuel only leaked sometimes. A casual look might have considered the float good. The needle and seat appeared to be new and I am guessing that someone else had overlooked the collapsed float.

Thanks.

Bill Stanley(NC)

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Dell (WA)

01-01-2001 21:48:07




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 Re: Re: Re: Low compression in reply to Rocky, 01-01-2001 08:33:56  
Rocky..... .."when I turn it over it actually blows gas out the carb".....sounds to me, like the intake valves are sticky and slow in closing and causing gas to blow out the carb. Since you haven't been using the tractor, the gum and varnesh of compbustion byproducts have had a chance to make your valves "sticky". I'd take off the valve covers and wash and scrub them with some Marvel Mystery Oil. Just a squirt and washdown of any solvent might do but MMO really performs..... ...Dell

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Fast ED Ohio

01-01-2001 09:31:05




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 Re: Re: Re: Low compression in reply to Rocky, 01-01-2001 08:33:56  
Rocky, I would go with Dell,s thing about cleaning the crud around the valves. Your carb. air intake should be sucking in, not blowing out, this points to stuck valves.



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Henry Rubach

12-31-2000 22:23:11




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 Re: Low compression in reply to Rocky, 12-31-2000 21:38:16  
Rocky,
I also have an 8N with low compression in the 60's range. It is very very difficult to get the thing started and if it does happen to start it barely has enough power to pull itself. Its a 1950 model and my dad purchased it somewhere around 1952 or so. It's all original and has been rebuilt numerous times because we used it so much when I was growing up. It always amazed me how much power the thing had after a fresh rebuild. When I rebuild it this time, I'm going to do a complete restoration and just use it for show...figure I owe it to the old N because of all its done for us. Thanks and have a Happy New Year!

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