Re: McCormick-Deering 10-20 Carburater guidance

Posted by Bob Kerr on July 01, 2009 at 10:40:56 from (216.249.73.90):

In Reply to: Re: McCormick-Deering 10-20 Carburater guidance posted by dave.koenigsfeld on July 01, 2009 at 07:59:15:

Hi Dave, The angle of the needle valve seat must be different than the angle on the tip of the needle valve for it to seal. I have had luck burnishing the seat with a drill bit running backwards with very light pressure and lift the bit while it is still spinning. Sometimes the tiniest bit of dirt or corrosion can cause the needle valve to seep and flood the fuel bowl. The machined grove I was talking about is on the inside of the float chamber and looks like a machining error when they were smoothing up the fuel bowl casting, but it is acually the float setting line to be used by the assembly guys and IH mechanics. Funny thing is, I never found a printed reference to that mark, but all the carbs I have have that line inside. When I rebuilt the carb on my 10-20, I first used the setting provided in the kit and man did I have problems like you are talking about. When I noticed that line inside the fuel bowl I thought, why would they make that same mistake on all of these carbs, well It turned out to be no mistake and that line is there for a reason. I set the top of the float to that line and she fired up right away and ran like a top afterwards although I did have another problem develop after I ran it a while and that was there was a dried drip of sealant on the cork float that hung up on the fuel bowl side once in a while. I took a fine file and dressed up that drip and not one problem after. I got many compliments on how nice it ran. Several old timers who farmed with 10-20s back in the day said it was the nicest running 10-20 they ever heard. One more thing, there are only a couple gaskets used on those carbs. One for the fuel inlet housing where the filter screen is and one to mount it on the intake. If you used a gasket anywhere else, it will change the highth of the suction tube and mess things up slightly. Don't worry about leaks happening, if the float is set right, the top of the fuel bowl cover to bowl will only seep some if you get on really rough ground and very little at that since the float seems to act as a slosh baffle. If you have more trouble, send me an email and I will talk you through it over the phone.

Replies:

• Re: McCormick-Deering 10-20 Carburater guidance dave.koenigsfeld 12:22:13 07/02/09 (2)
  • Re: McCormick-Deering 10-20 Carburater guidance Bob Kerr 07:53:52 07/03/09 (1)
    • Re: McCormick-Deering 10-20 Carburater guidance dave.koenigsfeld 13:04:44 07/03/09 (0)
• Re: McCormick-Deering 10-20 Carburater guidance dave.koenigsfeld 17:19:26 07/01/09 (0)

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