International 300

I have a 1956 International Harvester utility 300 with a zenith updraft carb.# 361525R91 that I need an Idle metering jet for does anybody know where I can get one. Thanks

(quoted from post at 12:55:58 02/04/11) I have a 1956 International Harvester utility 300 with a zenith updraft carb.# 361525R91 that I need an Idle metering jet for does anybody know where I can get one. Thanks

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That would be the same idle metering jet used in everything from the Farmall H up through the 560 and beyond.

Are you sure you have a 300U there ? 300U's used a IH built carb. Maybe you have a 330U they would have used a Zenith?


Andrew

(quoted from post at 14:01:30 02/04/11) Are you sure you have a 300U there ? 300U's used a IH built carb. Maybe you have a 330U they would have used a Zenith?


Andrew

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The IH built carbs are a Zenith design, but none of the parts will interchange with any other Zenith carburetor.

The part number he gave is correct for a 300 utility as well as a Farmall 300 row crop.

Thats a IH E-12 carburetor. Order jet # 49798 D75 from a dealer. May check with Mcdonalds Carb & ignition. They have some about half the price but don't know if they have your size.
Tractors sold with 361525R91 were supposed to be changed to 362525R92 specs by the selling dealer. But not all did. Does your carb have the high speed adjusting screw or just a plug there?

(quoted from post at 19:34:06 02/04/11) Thats a IH E-12 carburetor. Order jet # 49798 D75 from a dealer. May check with Mcdonalds Carb & ignition. They have some about half the price but don't know if they have your size.
Tractors sold with 361525R91 were supposed to be changed to 362525R92 specs by the selling dealer. But not all did. Does your carb have the high speed adjusting screw or just a plug there?

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Mine has the plug. Does this mean it is a distillate carb?

Mine has the plug. Does this mean it is a distillate carb?

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Plug is for a fixed high speed jet. It indicates your carburetor is later production calibrated for gasoline. My cousin's 350U is so equipped.

I believe all distillate carbs have the adjustable high speed jet.

(quoted from post at 01:14:28 02/17/14)

(quoted from post at 19:34:06 02/04/11) Thats a IH E-12 carburetor. Order jet # 49798 D75 from a dealer. May check with Mcdonalds Carb & ignition. They have some about half the price but don't know if they have your size.
Tractors sold with 361525R91 were supposed to be changed to 362525R92 specs by the selling dealer. But not all did. Does your carb have the high speed adjusting screw or just a plug there?

Click to expand...

Mine has the plug. Does this mean it is a distillate carb?

Click to expand...

Just to make sure we are referring to the same plug. Its the one near the bottom of the bowl pointed to the front of tractor when mounted on the engine. 361525R91 is a gasoline carburetor installed on early 300 tractors. 361525R92 is a gasoline carburetor installed on other 300 and on 350 tractors.
361525R92 came with a adjusting screw and nut and a few other changes in metering compared to a 361525R91.
Sometime in 1955 IH had a service bulletin that they wanted all the 361525R91 carburetors changed to R92. Enough change over kits with instructions were made to change over all R91 carburetors sold.
Some never were changed and one shows up ever now and then. Also find some changed without the ID number tag changed.
If yours runs okay don't worry about it. Mostly done for supposedly better fuel economy.
Those carburetors used a idle jet with a .021 orifice hole. Most M came with a .025 hole. Think H used one in between. Don't hold me to the sizes since just going by memory. Could look if needed. May be able to use any of the sizes and adjust the idle air to compensate, depending on other variables .