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1963 Farmall 560 very hard to start

J

jackson63

New User
I rebuilt the carburetor on my 560, Now it is very hard to start when its cold. Starts and runs great when its warmed up. I suspect I might not have the choke butterfly installed correctly. There is an arrow on the butterfly which I installed pointing up. Please look at the attached photos and let me know if I did it right. One YouTube video tells me the arrow should be pointing up the other pointing down. Thanks
mvphoto89282.jpg


mvphoto89283.jpg
 
The other question is: is it screwed onto the correct side of the shaft, assuming the shaft is in correctly to hook to your cable? Usually, the smaller spring-loaded opening is inline with a small hole inside the throat, where the venturi/vacuum effect can pick up more gas as it flows through that small plate. Steve
 
The little brass valve should open inward on suction. it is intended to limit choking to a degree when the plate is closed. The
plate should be centered with the screws just loose and tapped gently to allow it to touch all around. Make sure there are no
other contributing factors like slow cranking or weak spark. Jim
 
the butterfly choke valve is backwards, cause when the tractor starts it pulls this valve open to prevent flooding the tractor so it can
stay running.
 
Arrow goes down and valve opens toward engine when choke is closed. Make sure no air gap around
choke when fully closed. Have to make sure choke is centered properly before tightening screws.

Throttle valve has a tapered side and fits only one way also and must be centered with adjustment
screw backed out.
 
I'm wondering if it needs turned 180
degrees. Arrow pointing down, but same
side facing out.

I'm only going by, and it's hard to
see in lower photo, it appears to be
hitting at the top, and not the bottom
when closed. If turned a half turn, it
might touch both top and bottom at the
same time closing it completely off
for the spring valve.

I'm thinking the shaft should have a
flat side. If plate is screwed to the
flat side, then that part should be
right I'd think.
 
Looks right to me.

Is it fully closing when you have it mounted and the cable/linkage connected?

There is an internal choke circuit inside the carb. You should be able to find
a fuel circuit map online. It will show where the fuel flows under every
condition, including choke starting. Could be a clogged passage, incorrect
gasket between the bowl and body, warped body where it seals to the bowl.

When it fails a choke assisted start, does it drip a few drops of gas out the
air in of the carb?

It should. If it is not dripping, that is a sign the choke circuit is not
working.

If it is dripping, that is a sign of another problem, like lack of, or weak
spark, worn plugs, etc. Does it ever fire the instant you let off the starter?
Another sign of weak spark, weak battery, small cables, dragging starter.
 
i take my other answer back, this is correct. i dont know what i was thinking, but i admit i might have had brain on vacuum. daahhh.
 
Believe me , it is not correct and that carb has no internal choke circuit. Been working on them
since they came out in 58. It draws fuel through main jet and nozzle unless throttle is completely
closed, then it draws through main jet and idle ports.
 
All I can say about the position of the brass valve is
that the parts diagram shows it on the upper half when
the choke plate is closed. See link. As far as centering
it as it is installed here is what I do. Assemble the
choke plate to the shaft slightly loose. Enough so the
plate can barely move around. Now hold the choke
lever towards the closed position. Now gently tap the
choke plate with your screwdriver bit. The plate should
settle in the bore and center up. Sometimes it takes a
little back and forth snug screws then a couple taps.
Same process applies to throttle plates.
CNHI parts diagram
 
well you are half right ,... the arrow goes to the bottom. valve at the top. i had to inspect mine as to see which way the arrow goes. as i
knew that the valve has to get sucked open from the vacuum.

cvphoto120247.jpg
 
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