Case David Brown 885G/1 Gasoline Tractor

kippage

New User
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.
 
Everything you just described I went through with the 4600
gasser. I?m 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 I?ve also got the larger
paper filter pre-cleaner. There is not much to adjust on those
zenith carbuerators.
 
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
 

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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