Re: Tractor Sputtering - 1939 M

Posted by Janicholson on April 01, 2020 at 08:35:13 from (24.240.46.228):

In Reply to: Tractor Sputtering - 1939 M posted by Binderson on April 01, 2020 at 07:54:59:

The leakage out the weep hole is not normal, common, just not normal. The Load screw (bottom front
straight slot) is a supplement to the actual main jet. The screw at 3 to 4 turns out from its full
in location should be OK to get where you are going. There are differences between the main jets
of Distillate carbs, and gasoline only carbs, but not to worry. Do not bottom the load screw into
its seat like it was a deck screw. Gently feel for the seat. The tractor will either barely run,
or fail to run with it all the way in. When it is out too far it will make black smoke out the
exhaust. If yours makes black no matter what, and weeps as noted, it could have one or more of the
following things contributing: the float level could be set too high, the needle and seat
controlled by the float could be leaking. The seat can leak where it threads into the chamber top.
The weeping needs to be fixed before any further adjustments.
With it warmed up well enough (uncomfortable holding your hand on the block) set the throttle at
High Idle (wide open, not under load). Adjust the load screw inwards until the engine begins to
act starved. turn outward until you see the first evidence of dark smoke. Turn in until that just
goes away. Now push the hand throttle lever to slow idle, and let it stay there for 10 seconds.
Rapidly pull the lever to high idle (wide open). If the tractor stumbles and doesn't make clean
transition, open the load screw 1/2 turn at a time till it does.
This will get the mixture close. Next, pull a tillage implement in soil to load the tractor. If it
shows a very tiny amount of dark smoke it is near perfect. Incremental turning inward, 1/4 turn
from there might clear that small smoke, as long as it doesn't make it stumble on opening the
throttle. I have not discussed the Low Idle mixture, it is in the archives in many locations. Jim

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