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801 problems

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Bill Bailey

11-17-2000 08:15:32




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Does someone know if the carberator could be running to rich and cause the exhaust and intake to get way over heated. The tractor is not flooding out.




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H.A. Grabbe

01-01-2003 10:49:24




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 Re: 801 problems in reply to Bill Bailey, 11-17-2000 08:15:32  
Bill- usually a lean mixture can cause exhaust valve burning, not a rich mixture. I'm looking for the torque specs for this engine, specifically the rod bolt and head values.



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Dick - N.E. Pa.

11-24-2000 13:05:55




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 Re: 801 problems in reply to Bill Bailey, 11-17-2000 08:15:32  

I have an 801/861, and had the "sputtering" problem, when the engine got to operating temp. The manifolds, seemed hot , to the touch, and the tractor lost power, under a load. -- A friend told me that , I was probably experiencing "vapor lock". Sure enough, after I put a sheet of insulation between the valve cover and the gas tank, and wrapped the fuel line with aluminum foil, my problem went away. Possibly this is what is happening with your 801 ???

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Fred S

11-20-2000 16:45:30




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 Re: 801 problems in reply to Bill Bailey, 11-17-2000 08:15:32  
I've got an 801, and the only time mine heated up like that was when the manifold bolts worked loose. That really messes up the mixture. Also check valve adjustment and timing, both static and centrifugal advance.



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Bama Binder

11-17-2000 11:00:28




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 Re: 801 problems in reply to Bill Bailey, 11-17-2000 08:15:32  
Running rich won't overheat an engine. Rich mixture acually burns cooler than lean. Now if the cooling system isn't working right, you can overheat an engine either way.

Usually the mixture is set with the engine at full operating speed. Turn the mixture screw on the high speed circuit in until the engine begins to loose power. Back it out until the engine revs pick up to max and then turn it an additional 1/2 -1 turn on the rich side just to be sure.

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Bill Bailey

11-17-2000 15:29:26




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 Re: Re: 801 problems in reply to Bama Binder, 11-17-2000 11:00:28  
The exhaust smells real rich but the tractor sounds good. After about 15 min. of running the intake and exhaust gets real hot and the tractor will sputter in a hard pull.



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Mike S

11-17-2000 09:47:16




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 Re: 801 problems in reply to Bill Bailey, 11-17-2000 08:15:32  
Hmm, I was taught that too lean would burn a valve, not too sure about too rich. Mostly smokes if too rich and power falls off. But there are better mechanics than me around this board. Sometimes too rich will not burn all the fuel and the residue will wash lubricant from the cylinder walls.



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Drew / Millington, MI

11-17-2000 16:44:52




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 Re: Re: 801 problems in reply to Mike S, 11-17-2000 09:47:16  
Mike S, well, I guarantee that I'm not as good as a mechanic as you, but "rich" does burn cooler than lean. "Lean" can burn the valves. This is a general rule of thumb.

(Modern autos, try to burn at "stoch" - 14:1 ratio, the optimum "burn". To cool the temperature of combustion, exhaust gas if fed back into the intake manifold (EGR) because less oxygen results in a cooler combustion temp (also why "rich" burns cooler) but "rich" means unburned hydrocarbons out the exhaust.)

What puzzles me is that the 801 gets hot at all! Updraft carb and combo intake and exhuast manifold, coupled with low compression, should hardly get warm.

- Drew

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Bill Bailey

11-19-2000 17:10:43




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 Re: Re: Re: 801 problems in reply to Drew / Millington, MI, 11-17-2000 16:44:52  
Do you have any ideas why the exhaust and intake is getting so hot.



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