Step-by-Step Carburetor Overhaul|
1952 Ford 8N
by Don Stewart
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Once the float needle is out, use a large, wide straight slot screwdriver to
remove the float seat. This can be kinda tricky since the screwdriver bearing
surface is so very small. Secure the upper body carefully in a soft-jaw vice for
firm support and apply constant level pressure to the screwdriver to keep the
blade from slipping. The seat is brass and is soft, but the threads will give in
before the screwdrive slot gives way, as long as the screwdrive doesn't slip.
Next to the float seat is the idle jet seat. This is the jet into which the
idle screw/needle fits when the carburetor is running on your tractor. Removing
this tiny jet is also tricky since its bearing surface is even smaller than the
float seat. Use the widest straightslot screwdriver that will fit the casting
hole and fit into the idle jet slot. Same as before, keep the screwdrive from
slipping and the jet will come out.
While it is a lot of work to get these parts out with destroying them, it is
crucial to the rebuild that the boilout chemical be able to get into the
passages behind these seats.
The rebuild kit provides you with a new float needle and seat, but not a new
idle jet. If you damage the jet (ie. the seat is all galled such that the idle
screw/needle won't fit into it) you will have to purchase a replacement.
Annoying, but not expensive. An you will have learned why the screwdriver
shouldn't be allowed to slip.
Assuming that your rebuild kit has the replacements, discard the old float
needle, seat and gasket, and the old steel float retaining pin. Retain the idle
jet (seat) and the float, and, of course, the upper carburetor body.
Purchase a sealed gallon of carburetor parts cleaner from your local
automotive parts store. AutoZone/Checker/PepBoys/Kragen ... sell these one
gallon cans, including a small parts basket inside for around $12-$15. Make sure
it comes with a parts basket inside, you don't want to be getting this stuff on
When working with carburetor cleaner use appropriate safety glasses and
gloves. This stuff is caustic and if you get a few drops under you ring against
your finger, it will burn until you can flush it with water.
Drop the upper carburetor body, idle jet (seat), the power mixyure
screw/spring and idle mixture screw/spring into the parts basket and lower it
into the cleaner. Make sure it is completely covered. Watch out for splashes!
While the upper body is in the soup, let's work on the lower body.
On the bottom of the lower body are, variously, one or two plugs. One (the
float bowl plug) takes a wrench to remove, the other (power circuit plug) takes
a straightslot screwdriver. Again select the largest scredriver that will fit
the slot in the plug and don't let the screwdriver slip.
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