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IH 300 Carburetor Questions

A

ATF-110

New User
I"m rebuilding the carb on my IH 300 and noticed what looks to be a small homemade sheetmetal piece on the Choke Plate small opening, it is held on with a sheetmetal screw. I have several manuals but neither shows this clearly.
Carb has a brass button marked 361525R92.

What is the function of this small opening?
What should be on this choke plate opening?
Where can I get one?

After cleaning the carb I noted it had some paint on it.
Was the carb originally painted?
If so, what would be a good paint to use?

Is there a good manual that shows this carb and all components?

Thanks
 
Originally there was a small spring loaded plate over the hole. It probably came off or was damaged and replaced with what you see. It was supposed to help from over choking.
 
If it is what I think you are describing, some choke plates had a small round disc that was spring loaded to let some air thru when the choke was completely closed. It probably got damaged or someone removed it and blocked the hole off. You might try the dealer or see if you can find another old carb that has the plate still intact.
 
(quoted from post at 05:58:29 06/11/12) If it is what I think you are describing, some choke plates had a small round disc that was spring loaded to let some air thru when the choke was completely closed. It probably got damaged or someone removed it and blocked the hole off. You might try the dealer or see if you can find another old carb that has the plate still intact.
Click to expand...

That is exactly what it is. Don't know why IH thought it necessary though unless it was a counter-measure to deal with the tractor drivers that really didn't know how to use the choke?

If the choke plate is intact and not worn, and the small button is secure with that sheet-metal screw, I'd just leave it alone. If you really want to change it out, and your Case-IH dealer can't help you, a choke plate from an M, super M, or super H will fit
 
I have a 1956 international 300 utilty tractor with the same carburetor # 361 525 R92.The part number for the chock assembly is 362 036 R91 it composed of 1 screw 131 963,1 shaft and lever 357 000 R91,1 swivel 64 283 DBx,1 washer 32 592D.I think if its intack you will be alright with it.I needed a idle metering jet for the same carburetor i found one at Messicks after calling other with no luck. The phone number is 877-260-3528 I hope this helps.
 
Thanks for all the replies thus far!
I'll just leave the choke plate modification in place for the time being.

More carb questions:
I noted on the top and bottom halves of carb there are casting marks of "56" on the top and "53" on the bottom. The top also is stamped "-56" on the machined mating surface.
What do these markings indicate?
Year of tractor or carb?

The bottom (bowl) half of the carb also has a threaded in brass orifice near the center that sticks up about an inch above the machined mating surface and inserts into a drilled hole in the top half. I don't see this part on any of the carb drawings for the IH 300 Utility. Top casting of carb has brass tag (361525R92).

Do I have a mix and match carb parts?
 
Look at the parts diagram Wayne posted. # 27 is the idle metering jet and sounds like what you describe. It screws in the bottom casting and has a slot for a screwdriver to remove or install. Take it easy if you try to remove it its kind of fragile. If the bottom half doesn't have part # 40 in the diagram. Or doesn't have a flat looking plug with a screw driver slot in the bottom between the drain plug and the drain hole its probably the correct one. What looks like a plug realy isn't, it holds the main discharge jet in on some other numbers of carburetors but your # doesn't have the retaining nut.
Some have a month and day stamped on the manifold mating surface when built or made. Never noticed a date on the bottoms, sometimes numbers here and there. Is the 5 and 3 side by side or at different spots?
 
The carburetor part #27 in the parts diagram has descriptor “JET, idle metering (distillate or kerosene, used with carburetor, 363741R92). The jet on mine does have a screwdriver slot, I did not try to remove it.

On my carb the item at part #40 location is a pipe plug.

The “5” and “3” are not exactly side by side but are close (these are casting marks not stamped) .
 
(quoted from post at 07:59:54 06/19/12) The carburetor part #27 in the parts diagram has descriptor “JET, idle metering (distillate or kerosene, used with carburetor, 363741R92). The jet on mine does have a screwdriver slot, I did not try to remove it.

On my carb the item at part #40 location is a pipe plug.

The “5” and “3” are not exactly side by side but are close (these are casting marks not stamped) .
Click to expand...

You are better off not trying to remove that idle metering jet. You will only succeed in twisting the ears off the scredriver slot, or even worse, twisting the whole thing off and leaving only the remnants still screwed into the hole, and then it would need to be drilled out, and the hole re-threaded.

If that idle metering jet is intact, and not damaged, you need only make sure it is clean inside.
 
Pipe plug is the same as what I called a drain plug. 361525R92 didn't use the other part in the bottom of the bowl, the main discharge jet nut part # 47402D. So you probably have the correct bowl. The internet parts site like pictured doesn't tell enough information. There's 2 # 27. One for your carburetor # is 49798 D75 and is also used on 363741 R92 distillate and kerosene carburetors. The other 27 was used on 363741 R91 carburetors.
 
I HAVE THE SAME CARB ON MY IH300U I REPLACED THE METERING JET WITH NO PROBLEM JUST TAKE A SMALL PAIR OF VICEGRIPS, CLAMP IT HALF WAY ON THE JET AND TURN SLOWLY,A NEW MERTERING JET MADE A BIG DIFFERENTS.RUNS GREAT NOW. GOOD LUCK
 
(quoted from post at 16:15:42 06/19/12) I HAVE THE SAME CARB ON MY IH300U I REPLACED THE METERING JET WITH NO PROBLEM JUST TAKE A SMALL PAIR OF VICEGRIPS, CLAMP IT HALF WAY ON THE JET AND TURN SLOWLY,A NEW MERTERING JET MADE A BIG DIFFERENTS.RUNS GREAT NOW. GOOD LUCK
Click to expand...

You are one of the lucky ones. I can guarantee that little piece of brass will just break or twist off 99% of the time.
 
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