Posted by mattofvinings on May 31, 2009 at 11:44:23 from (67.142.161.35):
This is a 1953 SA, Carter "UT" carb with aluminum bowl and cast iron top. Original 6V system with positive ground and breaker point ignition.
I ran the tractor this morning, to use the weight of the front tire to help compact a trench I'd dug and then refilled. It was a little difficult to start but once running it ran like always.
Parked the tractor like always shutting off fuel and elect, then decided about 20 minutes later it was OK to start mowing.
I haven't been able to restart it in the several hours since.
Here's what I've done so far.
- checked spark, bare wire from coil to block, 1/4" gap, plenty of sparks. Did the same with the center coil wire, again lots of spark across a 1/4" gap.
- checked fuel...I think this is where the problem lies. I'll get a fast drip of fuel from the bottom of the carb out onto the ground. This tells me the needle valve isn't seating. I've had the carb apart several times and blown it out with compressed air, carefully checked main jet with a soft wire for blockage. I've had just the top half of the carb on the tractor to confirm that I could shut off fuel by hand-manipulating the float and needle. Bent the floats down approx 1/16" more to get a more positive seating force on the needle. Works great by hand. Put the bottom of the carb on still filled with fuel and it holds....except when I go to cranking, then fuel starts running out the bottom of the carb and stays that way until I shut off fuel at the bowl under the tank. I've had the carb-bowl drain plug out and confirmed that the float is not stuck against the sidewall, I can move it freely with a small screwdriver.
I've made no adjustments to linkages, screws, etc. Tried starting with full choke and no choke.
Couple other things are that I'm not the first one inside this carb. The screws show signs of a lot of action and the two brass meters show signs of attempted removal but the meters themselves look OK.
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