If you dont have a special tool, you can use an old flat file. Check for low coolant, loose fan belt, debris in the radiator fins, and a stuck thermostat. Unless you are buying a lot more parts than you need, you are going to be stuck with two choices, the jets that came in the carb or the ones provided in a rebuild kit. This special tool needs to be wide enough to catch both slots in the Float Valve Seat. C6As mentioned, the Main Power Jet is under the Main Nozzle. Manual ones are cheaper, but they have more moving parts and require more maintenance than electric ones do. Before you begin, make sure to drain the gas from the tank on your 8N tractor. The pump base on the 8N was cast iron.
D5Jet Info - Some rebuilders are convinced that specific sizes for jets work better, but the simple fact is that these carbs had a wide variety of "standard" jet sizes over the many years these tractors were built, and all carbs are basically interchangeable for all 9N, 2N, and 8N tractors. Among many places that I have seen that carry them, Wilson Tractor Parts has them on sale. You should now have a saw horse ready to place on the hood. Most of the ones on ebay look like generic imports. A3This is a good time to start snapping some photos. The choke shaft seal is a felt washer.
E7If you took the shafts out, reassemble shafts, plates, shaft seals, and finally install the mixture adjustment screws. is in dyer straights but do you think you may be able to take it to a machine shop and see if they can remove the easy out and insert?
Hold the screwdriver squarely in the slot. After recording the settings to the nearest 1/4 turn, remove the adjusting screws and springs completely.
I believe the new seats are being made with a thread spec that is "close" but not exactly right. Carburetors are limited to replacement only, no refunds or replacement will be given if rust, dirt, etc.
The chart below is provided in the event something did not come apart as it should.
Fasteners such as carb body screws may have been stripped and drilled out for oversize hardware. B7Flip the top over and remove the float hinge pin, float, venturi, and peel the gasket off.
None of these trademark holders are affiliated with this web site, nor is this site sponsored or endorsed by them in any way.
For example, if your serial number is G187, it means it was cast after July 18th, 1947.
5Assorted Bits for the Pin Vise in inch sizes from 0.025" to 0.060". Alcohol blended fuel throws another wrench into the works because the alcohol part is only about half as volatile as gasoline. A bad water pump will squeak. Copyright 2018 Stevens Tractor. 2GrinderAny type that you can use to make special tools. I had to drill them all, pick the threads out, and run a tap in every hole. This will ensure that the engine runs properly and efficiently.
C7The other two jets are in the carb top. Then you can unscrew the shaft and plate, and remove the shaft. C9If the shafts were very loose you may need to drill and install new bushings. You may need to pry around the edge a bit to separate the bottom half of the carb from the gasket material.
Linkage rods have spring-loaded ends that fit over a ball joint. Alternatively, you can purchase separate bushings. Monday-Friday 7:30 AM - 5:00 PM | Saturday 7:30 AM - 12:00 PM | Sunday CLOSED.
Make sure you have seen the horses ready so you can put the hood on securely.
Pay close attention to how the venturi (round thing in the middle) is installed in the carb top through the gasket.
If ok, continue installing cover screws and tighten them in stages to gradually snug the cover down.
Does anyone have any experience with the Zenith? I have found that the holes in these carbs can be cleaned working without removing plugs. Once this is done, you can install the new air tube.
Sometimes things will come loose easier if they are first tightened very slightly. Changes made to the 241C that were intended to maximize efficiency caused too many problems. The carburetor shaft often requires the most maintenance. Let the PB Blaster work for as long as you can. 7A selection of wire strands in various sizes that can be threaded through passages to clean them out.
Most 3/8" nut drivers will slip over the Nozzle, but may not provide enough leverage or control to remove the nozzle. There seems to be a problem serving the request at this time, {"modules":["unloadOptimization","bandwidthDetection"],"unloadOptimization":{"browsers":{"Firefox":true,"Chrome":true}},"bandwidthDetection":{"url":"https://ir.ebaystatic.com/cr/v/c1/thirtysevens.jpg","maxViews":4,"imgSize":37,"expiry":300000,"timeout":250}}. Now the screws cannot back out on their own. A tight-fitting open-end wrench may work ok, as long as the nut wasn't previously tightened by a gorilla. However, the carburetor can wear out over time, which means youll have to replace it. Idle Jet = 9N/8N 9596 M/S #49-165 #10-32 Thread This is especially true when mission creep sets in, and it's over a year later that you are putting things back together (hint hint).
That is not a fair test, but I was still pleased with the result. Then, the idle screw must be backed off until the throttle plate is tight.
Alternatively, you can replace the seals with genuine Ford tractor oil and grease.
The fan belt should have at least a half-inch of flex at its mid-point.
Does anyone have a recommendation for a replacement carb for the original Marvel on a '47 8N? If not, you may need a much bigger can, so you can drain the tank and replace the valve. All N-Series TractorsFord-Ferguson 9N, 2N, and Ford 8N.
Use your third hand to do that.
The carb I used to test this process was the really nasty one pictured above. This rebuild is based on the original type Marvel/Schebler Carburetor. If you have an older tractor with a manual one thats worn out, consider replacing it with an electric one because it will save you money in the long run if youre planning on keeping this tractor for a while. We are removing it now, so it won't get bent later.
This isn't a huge issue.
The shaft and blade should fit snugly in the hole and in the jet slots.
C8The Economizer Jet is located deep in a hole to one side of the Idle Jet. For the best experience on our site, be sure to turn on Javascript in your browser.
The throttle shaft should have a neoprene seal. If your tank is rusting then this will contaminate your fuel. Clean up sorting good parts from stuff that will be replaced. If you don't have access to shop equipment like that, these carb parts can be carefully drilled-out by hand. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Copyright 2017 - 2022 Justagric | Designed by Godwin Chibuike, Best Replacement Carburetor For 8n Ford Tractor.
I've found this is usually nearly impossible to get wrong.
These are pressure-balanced type carbs, so the engine draws what it needs at the ratio you adjust using the Idle Mixture and Main Mixture screws.
Cleaning is absolutely the most critical part of any carb rebuild, and where most failures occur.
The screws for this part are usually located in the shaft and can be easily removed with a screwdriver. The new aftermarket M/S types that I have seen are poor quality. Try to replace the seat by hand, if youre unsure about its thickness.
These changes improved the tractors overall strength. Count turns as you screw the main mixture and idle mixture screws in until they bottom in the holes. To replace the shaft of the carburetor, you must first remove the idle screw and then insert the throttle plate.
The Marvel/Schebler carbs were VERY successful.
I keep all of the old parts until I'm done and don't throw away any parts that appear usable, even if I'm sure they will be replaced.
Please be patient during this time.
If you have a good eye, a piece of 1/4" dowel rod makes a great gauge to roll across and measure with. A 3/8" 6-point 1/4" drive, deep well socket should be long enough, and thin enough to get on the 3/8" hex. This fitting is soft and easily bent. Guitar string is my first choice.
If a kit has new jets, verify that the new jets have the correct size hole before discarding any old jets.
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The serial number of your 8N tractor can help you determine the date of manufacture.
What kind of performance increase would there be? So, without getting too excited about it, I always check jet hole sizes and try to make sure the Idle jet is at least 0.032", the Economizer Jet is at least 0.046", and the Power Jet is 0.050. There is no substitute for a screwdriver specially-ground to fit. Once screws are out, remove the plates, and slide the shafts out. The studs should stay in the carb. All of the new float seats I've installed seemed very hard to get all the way down.
Bushings are not provided in kits, but are available separately. For the most effective results, replace the neoprene shaft oil seals before tackling the other components of the seals.
Hold the screwdriver firmly and squarely in the slot and apply just enough force to break the screws loose. If not, no problem, just run a #8-32 tap into the hole and make sure there are good clean threads for a new jet. If you have a drill press, some have an accessory vise that can be used to clamp the carb body square to the bit. This is where you will need Special Tool No.2 again. 1Special ScrewdriversCollect 2 or 3 old useless straight blade screwdrivers and an old dull flat file about 1/2" wide.
The Fora platform includes forum software by XenForo, Outdoor Hub, LLC (d/b/a Carbon Media Group), 30800 Telegraph Rd, Suite 1921, Bingham Farms, MI 48025 USA. Spray some carb cleaner in the carb halves and place them where they can soak a bit. The modern equivalent is a 1/8-27 NPS (national pipe straight).
The main complaint with these carbs seems to be an idle adjuster that has no effect on the engine, even with the idle screw completely out!
To replace the carburetor on a Ford tractor, locate the identification number on the carburetor shaft.
The choke shaft should be accessible once you remove the gas tank.
The Idle Jet is easily visible near the float seat. Do rinse thoroughly, until all vinegar smell is completely gone, or the carb will immediately start rusting again. Something went wrong. If your fuel is contaminated, you cannot fix the problem with a new carburetor. What we want to do is thoroughly clean the carb, and fix anything that may have been wrong.
The idea is to remove the jet without having to drill and tap the remains out after wringing the top off. If your model has been discontinued by the manufacturer or if they no longer make manuals for it, then you might want to consider getting an aftermarket manual instead of trying to find parts online it may be easier than finding parts online anyway. These tractors are identifiable by their flathead engine wihich has the carburetor mounted on right hand side of engine. All Tradenames and Trademarks referred to on these web pages are the property of their respective trademark holders. Put the economizer jet in and snug it in place. Carb rebuild kits are available in two versions for the M/S carbs. Flip the throttle or choke plate open. Digital photos are free, so there's no reason not to photograph everything as it comes apart. If the seat is tight, with the correct seal under it, the carb float should not require bending to get the correct height. B3Check the choke and throttle shafts for side play in the carb body. If the old neoprene seal has deep scratches, it will eat into the new neoprene seal and leak more than ever.
9Air Compressor or perhaps canned compressed air to blow out and dry passages.
for the 9N and the last TSC-241B spec. Loosen the air tube hose clamp at the carb and pull the air tube off.
Its easy to find a new air tube with the same inside diameter as the old one. WARNING Products may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.For more information, visit www.P65Warnings.ca.gov. This would explain why the new seats start to bind after a few turns.
A new seat will bind after a few turns, so take your time. The actual fractional dimensions closest to the decimal tolerances are 17/64" and 19/64". We sell fuel tank sealer,NR1251&NR1259.
Usually found at hobby supply stores.
Fits 2N, 8N, & 9N only. E1Before we start putting things back together, these are soft brass parts going into a cast iron carb body. For the best experience on our site, be sure to turn on Javascript in your browser.
If you want to know how to replace the choke shaft on an 8n Ford tractor, you have come to the right place. That is good, there are plenty of used carbs, and replacement parts available. Many carbs rebuilt by previous owners will not have been properly and completely cleaned. It may take a little prying to free the manifold gasket. The entire top surface of the float should be parallel with and approximately 1/4" away from the gasket surface.
Marvel Schebler Style Carburetor for Ford Models 9N, 2N and 8N, Skip to the beginning of the images gallery. One bit of gum, varnish, or crud left in those passages WILL prevent the rebuilt carb from performing properly. We also offer a new fuel tank, 9N9002.
We still need to stay completely square and perpendicular to the item being drilled. You may need to tap the hole in the top plate to accept the econ jet. Most things like jets only need to be snugged down. The Idle Jet is a larger #10-32 thread and will be the only jet that will thread into the idle jet hole, next to the float seat. Nearly all of the M/S type carbs can be rebuilt to the TSX-241B specifications.
I ended up reworking the original carb and it worked fine.
This may be due to not understanding how the idle mixture screw works on these carbs. E3Check the float adjustment while holding the top of carb upside down. The engine will still start, adjust, and run well. Hey guys we'er talking the 1940's here!! That is often hard to get exactly. Were going to talk about some of the best replacement carburetors for an 8N Ford tractor.
If these components are damaged, you can replace them with the appropriate parts. About quart size should do it. C3The remaining disassembly is necessary.
If not, make sure it isn't broken off and wadded up inside the carb.
if this adjustment seems way off STOP, and make sure the seat for the float valve is screwed all the way in. E2Install the correct jet into each hole. Notify me of follow-up comments by email. This one is missing the choke shaft, and judging by the hole where the shaft should be, it will need new shaft bushings. You can also clean the air tube with sandpaper. Please use a flare nut type wrench, so you don't immediately round off the corners of the nut. A4Next remove the linkage and air tube. 3Pick ToolsPointy Steel Picks with various bends at the end. There is a Basic Kit that should sell for around half what the complete kit costs.
D2Some of the passages in these carbs may never have been completely drilled out and many of the jets being provided in kits are the wrong size for a Ford tractor. Any jet smaller than the minimum sizes listed in bold can be drilled out using a pin vise and the appropriate bit. It may be best to let the PB Blaster work overnight.
8N-9510 TSX-241B = 8N 313112 and up. You will need to remove four bolts from the dash and two from the doglegs. Drop all the small parts into a glass jar, add some carb cleaner and cap it. You should not be making new threads, just cleaning out threads that are already there. Most of the original or new aftermarket carbs sold for these engines can perform equally well, as long as they are properly checked-out, cleaned, and tuned. 4Pin ViseA very small drill bit holder. After that, youre ready to use your tractor. Any jet significantly larger than 0.050" is tossed in the trash. Select or grind a screwdriver that fits snug in the slot and hold it in place firmly so you don't damage the screws.
That's certainly a lot less expensive than soaking in carb cleaner. Careful even pressure will release the soft metal jet from the threads in the carb casting without damage. Toss them in the jar of small parts and give it another swirl. A large screwdriver or even a dime gripped in vice grips, can work as well. After way too many hours researching jet sizes, then rebuilding and testing a few carbs, it seems that almost any size jets can be used. To begin, disconnect the gas line from the tank and drain the fuel. A friend suggested soaking carbs in vinegar for a few days, then soaking in mineral spirits for a few days. A set of flare-nut wrenches may save you from rounding off those soft fuel line fittings. Once you have the throttle plates centered and screws tight. The other carb used in this step-by-step is hopefully much more typical of any carbs you will be working on.
Don't under-size the idle jet or fail to rod out and open the idle fuel passages. Pick a new, sharp or specially ground screwdriver that fits tightly in the screw slot. You should then disassemble the intake parts and clean them thoroughly.
For a better experience, please enable JavaScript in your browser before proceeding. The shafts may have oval holes. The main mixture screw is very long. Use solvents, scrapers, elbow grease, and compressed air in whatever quantity seems appropriate. We sell fuel tank sealer, NR1251& NR1259. Some people claim the Zenith is an upgrade. All of the passages need to be checked, cleaned and possibly drilled out to a size that is larger than the jet. Is there a performance difference among the replacement carbs? We will continue to ship your packages, but due to the recent COVID-19 pandemic, your packages may not arrive as scheduled.
C4The carb kits usually have a new float seat so remove that (Using special tool No.2).
The kits are a good deal if you actually need everything in the kit. is found in the carburetor or if it has been taken apart. A good carburetor can last for a long time. Sort of like setting a rivet, Pinch the screw so that last thread is slightly deformed.
Rubber gloves may be needed depending on what you use for solvents/cleaners, skin sensitivity, and how hands-on you tend to get with that stuff.
The photos can save a lot of head-scratching later. View cart for details. Our new carburetor includes the mounting gasket.
Please make sure you have clean fuel.
Ford soon issued Service Bulletin 118 with instructions to re-install the econ jet and restore the "241C" carbs back to "241B" specifications.
I find it easiest to use a smooth dowel and estimate that last 1/32". The carb can be tuned to run ok with just about any size that isn't too small. Put the wrench inboard as close to the carb as you can get it. I have used something as simple as a dime gripped in a pair of vice grips, but a properly-fitted special tool works much better. I did some checking and believe this is another of those issues caused by replacement parts from China that just don't fit. Almost all M/S carbs can be rebuilt to match the TSX-241B. Make sure the new seat is firmly seated in the gasket and that the pin is securely hung on the float with a pivot pin. I've never had one of those little screws in the throttle plates come loose, but I have seen what a small screw like that can do to the inside of a cylinder. C2Before taking them back to the workbench, get the carb halves and other parts as clean as you can inside and out. It's also nice if it has a pin to keep it centered. B5Carefully unscrew the fuel elbow fitting. The 8N Ford tractor is a classic, and its a great choice for someone who wants to get into farming.
If your fuel is contaminated, you cannot fix the problem with a new carburetor. The manual says the top of the float should be between 0.260" amd 0.297" from the gasket surface, using the standard thickness cork gasket. What's left of the choke plate assembly was rattling around inside the carb. You can easily remove the air filter housing from your tractor by unbolting two bolts and loosening the clamps on the air pipe. Some damaged parts can be salvaged.
When the fuel stops, this should confirm that your fuel valve at the tank actually closes off the fuel completely. New shafts can usually be obtained in kit kits. These seals are responsible for preventing leaks around the crankshaft.
E6Once you have that figured out place the top cover on and start a couple of screws. Speed and performance were not an issue!! Soak the area in PB Blaster first.
CAREFUL! The rear lift arms were also beefed up. I tried to make it work but it just required too many modifications so I returned it to Tractor Supply Center.
The flutes mess me up.
Current pump gas is only 10% ethanol, but it does make me lean towards the larger jet sizes. A new neoprene shaft oil seal will improve performance, but it wont last long.
I've seen some Zenith carbs listed that claim better performance, but are much more expensive. A5Remove two nuts at the manifold and the carb should drop right off in your hand. No need to be a gorilla and wring the threads out of something.
Most of these carbs have been rebuilt several times by now with the quality of work all over the place. E3Install the new float seat with the correct gasket (usually red color). It may be easier to do this with a neighbor. Sizes Found = (TSX-241B 0.024) 0.025 0.027 0.028 [0.032] 0.033 0.035 0.046, Economizer Air Jet = 9N/9N 9914 M/S #49-161 #8-32 Thread (small head)
If so, it only takes a second to crimp the screws with a pair of pliers. Once youve removed the float, remove the seat. Some screwdriver shafts are 1/4" or you could use a 9/32" drill bit. Gently apply enough force to loosen the screws. The float assembly is mostly below the gasket, but it's hinged to the top, so there is less chance of bending something if it all comes out still attached to the carb top. We will see why in a minute. If you have any questions, or problems with this site, please send me a message: When drilling out old jets or anything else in the carb, there is already a centering hole, so it is fairly easy to keep the drill centered.
8Precision measuring tool to measure bit and wire sizes. It helps that the material being removed is usually softer than the casting around it.
Replace the filter in the same manner. Look down in the hole with a brite light and make sure there is a jet installed. D3Some people find it necessary to remove the casting plugs to clean and check some passages. Make sure the float pivot pin hasn't slid off one side. The proper screwdriver will have a flat blade no wider than the shaft. So if you raise the float (more clearance) this will actually be a lower float setting when you flip the top over and assemble the carb. Then drop the float needle into the seat, set the top gasket on, and hang the float in place with the pivot pin. E5Place the venturi into the top cover gasket. C5Removing the Main Nozzle is a bit obvious. Make sure to note your carburetors settings so you can make future adjustments if necessary. Watch for screw slots that have already been damaged by using the wrong size screwdriver. The main nozzle on this carb was so rotten, it snapped off when I tried to loosen it.
If you cut your own gaskets, make sure you take any change of gasket thickness into account. To do this, youll need a special tool to catch both slots of the float valve seat. Carburetors are limited to replacement only, no refunds or replacement will be given if rust, dirt, etc.
I tried one of the generic imports on my Cub 154 Lo Boy years ago and was tremendously unimpressed with the quality and poor fit.
A1Find a small fuel-resistant plastic or tin container. This is an idle "air" adjustment, so it works backwards from practically any other carb on the planet. I pulled the pieces out a couple of times, to brush away loose paint and dirt.
I consider the two bold values as minimum and maximum sizes for each jet. Please make sure you have clean fuel. Ford- Fits: [ 9N, 2N, 8N, (with 120 cubic inch flat head engines) ]; Replaces:8N9510C,9N9510A,B3NN9510A, Carb Mfg #'s- : TSX241A, TSX241B, TSX241C, TSX33. TIP:This is something that is more likely to be a problem with other vehicles, where the carb mounts on top of the engine. If the shafts need to come out, snap photos to document how the plates, screws, and choke springs fit. Absolutely no way do we want to give those screws any chance to rattle loose and get sucked into the engine! You can also replace the bushings separately if the shaft is in poor condition. There is usually some fuel still in there (and of course fuel vapor is explosive) so don't light a cigarette yet. Write down those adjustments for info. Putting new parts in a dirty carb often does not have the desired results. Each passage must be larger than the jet that goes in there, or the passage will restrict flow more than the jet.
We also offer a new fuel tank,9N9002. Sometimes the seals will be behind a metal retainer.
B6Time to remove the carb top. Some replacement float valves are a little taller or shorter, so if everything else checks out ok, go ahead and bend the float to get the correct 9/32" height.
If its not overheating, you have another issue.
The fitting should have a fuel screen on the inside end.
An old flat file or a very big screwdriver is a good start for this tool. Murphy can really test your patience sometimes. The main mixture screw is frozen, and the carb body screws were rusted in place. 8N-9510 TSX-241C = 8N tractors built late in 1952. Make sure that the lift arms are not worn or rusted as this may lead to a weak lift. If the screws are too short to crimp, I start rummaging in my spare parts for replacements that are longer.
However, if youre able to deal with a small leak, you can opt for a cast-iron shaft oil seal.
This part is usually made from aluminum. Wear safety glasses. Some floats and valves will use a small clip to help the float pull the valve out of the seat.
Unfortunately, this carburetor willnotfit overhead valve engines or Ferguson tractors.
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