TRACTOR PARTS Allis Chalmers Case & David Brown Farmall & International Ferguson Ford & New Holland John Deere Massey Ferguson Massey Harris Minneapolis Moline Oliver & Cockshutt Kubota / Yanmar

TRACTOR MANUALS

Allis Chalmers	Case	Farmall IH	Ford 8N,9N,2N	Ford
Ferguson	John Deere	Massey Ferguson	Minn. Moline	Oliver

Tractor Pulling Discussion Forum

CARBS

[Show Entire Topic]

Welcome Guest, Log in or Register

Author

ChadS

09-05-2004 10:47:13

Report to Moderator

IH had the right idea with this carb. They made alot of changes throughout the years with the internal parts of the marvel Shebler carbs they used on the Super H-450. To the best of my knowledge there is 5 different size venturis available for this carb, 6 if you count the IH 6 cyl venturi,, more on that subject later,, Most carbs, from the factory are jeted low, or lean, and usually were set for a 540 pto reading. Fuel economy, and what type of fuel used were the main stay at the time, power was sacraficed, just depened on the application the farms used their tractors for. Basicly I am going to talk about a good way to pick up 5-10 more HP by a jet change. The shebler carb is a metering stem carb, like all the others, a metering stem meters the amount of fuel that enters the venturi, from the bowl of the carb. there is 2 ways to meter the amount of fuel to the venturi, first is through the main jet adjustment screw, which meters how much fuel comes out of the bowl to the main jet, second is the metering stem. which meters the flow out of the main jet. Like I said fuel economy and the type of fuel kept these parts limited for performance back then, but todays new wave of antique tractor usage, (pulling) and plow days, it would be nice to make a good display of HP and running charateristics of your puller. Let me explain what happens to a basicly stock carb when it is on the dyno,, the engine, wont have a good torque curve, it has a low hp reading at 540, and when you pull out the plugs, they are either whitish color. or light brown. when tuning on the dyno, I like to see a nice cocca brown plug color at 540 and blow 540 rated pto rpm. then you know you are getting the right amount of fuel, for the engine you have, stock or modified. On most tractors I dyno,, I can remove the main jet adjustment screw compltely fromthe carb, and that tells me it is asking for more fuel. Time for a jet, and metering stem resize!! More later,,, ChadS

[Log in to Reply] [No Email]

ChadS

09-06-2004 09:05:44

Report to Moderator

More On IH Carbs in reply to ChadS, 09-05-2004 10:47:13

If you have a carb, that is under suspicion of needing rebuilt, remove the entire carb from the manifold and either have it rebuilt, or if you can do it yourself, rebuild it. Good kits are around 10-25 dollars. Make sure all the passages are clear, there is several passages casted, and drilled into the throttle body, under the venturi (on later carbs) then there is a small plug on the opposite side of the fuel line inlet, that is a air passage for the idle ciucuit. usually, if the carb is clean and runs well, then all that has to be removed is the carb bowl to perform a jet and metering stem resize. More in a few,,,,ChadS

[Log in to Reply] [No Email]

ChadS

09-07-2004 07:06:12

Report to Moderator

Re: More On IH Carbs in reply to ChadS, 09-06-2004 09:05:44

Ok, you have a good running carb on your tractor, and ready to rejet the carb. All the work is done in the bowl of the carb. After removal, you will disassemble the parts from the bowl,,, Main load adjustment screw, and the brass fitting, the center brass metering stem, (center of the carb, where the venturi sets over.) Be careful though,,, the small brass idle stem is very fragile, and if you drop the carb bowl, or bump the stem, damage to the stem will result. Use compressed air to clean out the passages in the bowl, or let it soak in cleaner if it is extremly filthy. Now you need to take the carb bowl with ya to town to the hardware store, To the drill bit isle!! You need to find the drill bit, that fits the main load jet that will tell you what size your current jet is, then you go up 4-5 more sizes larger drill bit. Ok, back home,, LOL,, drill out the main jet with the larger bit, then, with the same bit, drill out the bottom 2 holes on the metering stem. Clean out the shavings from the bowl, and the metering stem, and reasemble the bowl. On the main load adjustment for starters,, turn it all the way in on the seat, and back it out 1-1/2 turns, should allow the engine to start with out being too rich,,, Basicly the engine needs to be warmed up, and when you set the main load adjustment,, Get a helper to run the throttle, might be a bit safer, and save ya from running back n forth so much,,, Back the main load adjustment out till it starts to run rich, or smoke black out the pipe,, then turn it back in till it just smooths out. idle it back down, and rev it up a few times, there should be just a hint of black smoke come out of the pipe when you rev it up, (no load). To get the most out of this, is to put it on the dyno, or a pto driven implement to work the engine harder. I can tell you all this,, every time I rejet a carb on an IH, always found 5-10 more hp at 540, just depends on how good your ignition, and compression, cu in. Do I need a bigger carb??? More on that later,, ChadS

[Log in to Reply] [No Email]

jakeK

09-16-2004 14:51:37

Report to Moderator

Re: More On IH Carbs in reply to ChadS, 09-07-2004 07:06:12

I was reading your comments about the IH carb, can
the same thing be done on a JD with a MS carb, I
would like to pickup some extra horsepower, and
wonder if this would be an easy way to do it.

[Log in to Reply] [No Email]

[Show Entire Topic] [Options] [Printer Friendly] [Posting Help] [Return to Forum] [Log in to Reply]

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]

Home | Forums

Copyright © 1997-2023 Yesterday's Tractor Co.
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters

Website Accessibility Policy