Re: How hard is it to overhaul carb on a Farmall 130?

Posted by Gee on November 18, 1999 at 14:07:56 from (205.218.86.74):

In Reply to: How hard is it to overhaul carb on a Farmall 130? posted by Dan 130 on November 17, 1999 at 17:12:22:

I just did one on a 140...There are three types, You might have a Carter, an I-H, or a Marvel-Schuebler (that's what I had). On my Marvel..the floats are long and thin..they look like red peppers.. anyway..you take the top off of the fuel bowl. The venturi (or barrel) will drop out. It needs to be scrubbed well. The only parts the dealer had to give me were the big gasket that goes between the upper half and the fuel bowl (lower half, and the needle and seat that go in the upper half.) Make sure you can give hime the code off the little tag, or that you can take the carb into the store with you.

Any way...clean the upper half by removing the float by pulling the pin out to the side. Then, unscrew the little thing that looks like a jet. It runs to a passage that vents in the carb throat area. It unscrews with a small screwdriver. Then with a larger screw driver, take out the seat where the needle valve goes (the big brass part. )When you get these parts all out and scrape the gasket seating areas clean, you can spray everything out with carb cleaner, or soak for a while.

The lower area, the fuel bowl area is tricky because of all the passages. Remove the two plugs in the bottom..one will be a drain plug (rather big), and the other is a small brass screw that gives access to the main passage. With a socket wrench, remove the jet from it's seat (you can see it sitting at 45 degrees, with the nozzle in the venturi/carb throat area). When you remove this jet, you should be able to look all the way thru and see daylight where you removed that little brass screw in the bottom. If not, poke a wire in there, and poke out the crud so you can see thru.

As you look down at the top of the fuel bowl mating surface, there should be two tiny holes in the ridge that seperates the two halfs of the fuel bowl. They connect to the area where that jet you just pulled out with the socket sits. Get a fine wire and clean out the several holes that are in the body of the jet you pulled out with the socket.. They are very small and are opposite each on the thicker part of the body. Then clean out the small hole holes at the ridge. Then spray carb cleaner thru all the holes and make sure it comes out somewhere.

Now look at the bottom of the fuel bowl. You should see 5 holes at the bottom of the fuel bowl. Two connect to the big drain plug passage from where you pulled the plug out of earlier. Turn the fuel bowl over and run a wire to the left and right in this big plug hole to make sure these passages are clear, and the wire should come out into the bottom of the fuel bowl. The other two holes basically just connect at the back of the float bowl..make sure they are scraped clean too.

Now the tricky one. As you look down at the fuel bowl, at the rear where the two passages connect the left and right halfs of the fuel bowl there is a hole drilled into the ridge seperating the two fuel bowel halfs. At the bottom of this hole, there should be a little tiny passage that feeds fuel to the chamber where you unscrewed the jet. It is the only way that fuel can get to the jet, and thru the jet into the venturi/barrel to atomize the fuel in the air flow. If you can't see it, turn the fuel bowl upside down, and run a fine wire into the small brass screw hole that you pulled the screw out of earlier. This is a small passage, and runs up the back of the float bowl (not straight ahead where you see daylight). It must be clear, or else fuel can't get below the floor of the float bowl, and you won't get fuel to the engine.

Spray every passage with cleaner, and with compressed air if you have it to make sure no crud is blocking anything. Then screw the seat and valve and the little jet into the top half of the carb. Screw the big jet into the bottom half of the carb. There should be a little seal like a ring that goes on the jet's shaft. Put the drain plug into the bottom, as well as the little brass screw. Then put the big gasket in place, and install the float in place by sliding the pin into place. Install the venturi/barrel between the two halfs. It will only go in one way, or the two halfs will not seat together. Screw all four screws tight, and you should have it. I didn't do anything with the butterflys except spray them with carb cleaner.

Sorry to be so lengthy, but that should pretty much cover the situation. The other brands of carbs should be quite similar..

Gee

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