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Case David Brown 885G/1 Gasoline Tractor

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kippage

07-18-2019 08:31:20




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I'm trying to get some help with a poorly running Case David Brown 885 G 3 cylinder gasoline tractor. It runs, but the exhaust has black smoke and sometimes when I start it, it backfires and sends out a powdery black soot from the exhaust. when I remove the plugs and check them they are black with this powdery soot also except for one plug in cyl 3 that appears a little wet with fuel. The compression is good, I think, at 130psi for cylinders 1 and 2, and 138psi for cyl 3.When it runs it sounds as if it is misfiring or not firing on all cylinders.
I have just renewed the Points, condenser, rotor and cap, made and tested new plug wires. Plugs are new.

Point gap is set properly, Dwell checks OK, as is timing when Timing pin is in SP hole.

Valves have been adjusted to specs in manual, intake .010, exh .007

I've rebuilt the carb, then changed the carb.

Voltage to + side of coil is 12.57.
If anyone has seen similar symptoms and has a solution please respond.

If there is any member who has one of these would you be willing to take some pictures of the Carburetor linkage and throttle linkage. I'm not sure how the linkage parts on the carb are supposed to fit relative to one another.

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kippage

07-18-2019 16:56:56




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 Re: Case David Brown 885G/1 Gasoline Tractor in reply to kippage, 07-18-2019 08:31:20  
Thanks! Next step is check the oil bath air filter and the muffler. The horses are really going to freak out when I run without the muffler!



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Adirondack case guy

07-18-2019 10:50:20




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 Re: Case David Brown 885G/1 Gasoline Tractor in reply to kippage, 07-18-2019 08:31:20  
Aside from what you have done and what Rich told you; take the muffler off and try it with a temporary straight pipe. Clogged muffler will have the symptoms you describe.----- -----Loren



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DB4600

07-18-2019 10:38:33




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 Re: Case David Brown 885G/1 Gasoline Tractor in reply to kippage, 07-18-2019 08:31:20  
Everything you just described I went through with the 4600 gasser. Iím not saying it is, but what I found was my air cleaner plugged to the point of choking it and fouling. I dismounted the oil bath and cleaned it good. ( for some reason I found ample grass in the canister. I reinstalled it and run less oil in the oil bath pan because Iíve also got the larger paper filter pre-cleaner. There is not much to adjust on those zenith carbuerators.

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RGMartin

07-18-2019 09:19:34




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 Re: Case David Brown 885G/1 Gasoline Tractor in reply to kippage, 07-18-2019 08:31:20  
I'm not an expert on gas engines, but black soot to me says it is much too rich of mixture.



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