I will add to what Old said. Very often the seat is not good. Sometimes you can even see it is oblong. At any rate, I have a tip from an injection nozzle that has the proper angle for those seats and I insert the tip and tap it with a hammer.
Then, I put the needle in and suck on the end of the threaded end. It should pull the tongue in enough to hold the needle when inverting it and hold indefinetly .
Yes , they are bad and have been for many many years.
On a side note, IH went to the viton tip needle in the 60 series tractors because the larger fuel tanks apparently put enough pressure on the older steel seats that the 4 & 560's were constantly getting dripping out of carb complaints. The replacement needle and seat with viton tip did a real good job of sealing them up. It was years later when the quality went to pot.
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Today's Featured Article - My Ford Golden Jubilee - by Troy Estes. This article is about my '53 Ford Jubilee and a story that starts with taking the tractor to my brother's Starter/Alternator Rebuilding shop for a wiring fix. The generator was shot as well as all the wiring. I dropped off the tractor expecting a transformation from a 6 volt to a 12 volt system utilizing the original generator housing, and a total rewiring of the whole tractor. The front end center pin bushing was worn also so I ask that they replace it if they had time. Well, that’s wha
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