Step-by-Step Carburetor Overhaul|
1952 Ford 8N
by Don Stewart
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Ford 8N Carbs and Kits
Look around the throttle shaft to see if there are any really pronounced
burrs in the brass. You are about to pull the shaft out through the bore and
don't need any junk scoring the bore.
If the shaft is reasonably clean, grasp the linkage end of the shaft and
pull it out of the bore. It should slid out freely with a twisting motion with
Check this old shaft assembly against the new one in the rebuild kit. The
linkage end should be very similar.
Remove the idle speed screw and its spring. Clean any crud off of the idle
speed screw and replace it on the new shaft. Insert the shaft in the throttle
body bore. Correctly position the butterfly valve, aligning it with the screw
holes in the shaft. Reinstall the new retaining screws and tighten securely.
Reinstall the float seat with its round gasket and float needle in the upper
body. Install the new body gasket and seat the venturi (note the dot you placed
on the venturi to face the LOWER body). Reinstall the fuel inlet elbow/strainer
with a new gasket and filter. Place the float over the float needle and insert
the steel float pin through the ears in the casting to retain the float.
On the lower body, reinstall two drain plugs, the main discharge nozzle and
the main jet.
Check the float level by holding the upper body with its manifold studs down
so that the float tang rests on the float inlet needle and measuring the
distance from the gasket to the closest part of the float. Adjust the tang by
bending to get 1/4" clearance.
Reassemble the upper and lower housings making sure the gasket is not
crooked and that the venturi seats properly with the lower body. Install the 4
body screws and tighten.
Reinstall the power mixture needle/screw and its new gaskets, and reinstall
the idle mixture needle/screw and its new gasket. Screw the two mixture screws
closed then back off 1-1/2 turns. Back out the idle speed screw on the throttle
shaft until the butterfly fully seats closed.
Look around: Do you have any extra parts?
If not then reinstall the carb on the intake manifold with a new gasket (you
did clean the manifold gasket surface didn't you?), and tighten the manifold
nuts. Reattach the air inlet hose and tighten the clamps. Reinstall the steel
fuel line flared fitting to the fuel inlet elbow/strainer and tighten with a
flare wrench. Reattach the carburetor linkage, one between the throttle linkage
and the governor, and one between the choke linkage and the dash mounted choke
Turn on the fuel valve feeding the carburetor and check for leaks, tighten
as necessary. Put the engine throttle at idle and start the tractor. This may
require more than one set of hands: adjust the idle mixture screw out until the
idle starts to stumble, then turn the idle mixture screw in 1/2 turn. Set the
idle speed screw to 400 rpm. Run the engine throttle up to max rpm and back out
the power mixture screw until the engine just starts to lose power, then screw
back in 1/2 turn.
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