Carb. on Model A J.D. tractor

[Anonymous-0]

Took the carb off the A it was full of rust.Cleaned the carb and I can't get the brass peice in the center of the carb to move. Is it a free moving part? It had a spring under it .What does this part do?Do I need to get it free?I'm looking for some manuals for my new projects trying to find a deal. So if anyone can help me out until I get some that would be great.Thanks for all the replies to my other postings.

 

[Paul from MN]

Blaine that brass part is the nozzle and yes it does come out. In fact when you put it back together you will need a spring to hold it in place.

Getting it out is fairly easy. Use a fine thread tap and tap the first 1/4 inch or so of the nozzle.

Now take a bolt that matches the threads you just tapped. Place a nut and a washer on the bolt, then screw the bolt into the threads of the nozzle.

Gently tighten the nut and it will pull the nozzle out.

You should clean up the entire carb, nozzle etc with a bead blaster. I'd clean up the area around the nozzle with the bead blaster before you try to pull the nozzle out. Removing all the deposits will make it pull out easier.

You will also need to clean out all the passages in the carburetor, and it will take a drill bit to do that.

If you have not cleaned one of these before I would highly recommend getting the DVD's from Roberts Carburator Repair. If you don't want to spend money on both of his DVDs, get the 2nd one.

Good Luck,
Paul

 

[Anonymous-0]

Heat the stem hot with a Acetalynene torch, throw it in a bucket of water to quick cool it, use a long screw up the center hole. It will pull right out. Wit no damage done. Clean it up, make sure all the holes are clear and reinstall. You will need the spring to hold it in place until it rust fast again.

 

[Anonymous-0]

I personaly never mess with tapping threads and trying to find the right bolt and all. I simply use a self ----DRILLING screw with a hex head. I put it in a battery powered drill and spin it in till it is snug, then wrench it out the rest of the way. I should add a fender washer works good to put on the screw. Always check with your finger to make sure it is moving as you tighten. Heat is always your best friend with those carbs.

That nozzle in simple terms is what gives the tractor a extra shot of gas when you dump the throttle fast so it does not sputter.

I always bead blast every carb, including the nozzle passage before I try to pull it through all that rust, as a common sence issue.

I think three different carbs have showed up with taps broke off inside, then I get to try to fix them. I feel selfish always wishing I got to try first before they twist off every drill plug etc. Taps are very hard steel and you have to heat them a few times to soften the tap.