The carb on my '47 VAO just started spitting gas out the air intake. I've never had a carb do that. I just cleaned a bunch of rust, grease, and gunk out of it, and put it back together with the jets adjusted, put it on, turned on the gas, and tried to fire it. What did I do wrong putting it back together?
- Thread starter CaseyCub
- Start date
Stuck intake valve, leaking gaskets between carb and intake, too much fuel input, low compression, timed wrong...could be a lot of things. Is this the one that was stuck? If so I'd loo at valves and low compression. The question is will it run? Sometimes getting them running and warm loosens up stuck/sticky rings and valves.
This is with BOTH VAO's. The one that was stuck turned out to be the transmission with a gear out of the shift forks.
Fixed it, once I had a visual from another member and an extra set of hands from my dad. We regapped all the points and
plugs, replaced both condensers, and finally got spark at all cylinders. Needle in one carb was stuck, cleaned it out
(again). There is no gas coming out between the carb and the intake. I've got both set to the specs recommended by
several other VA owners. Timing checks out on both tractors. None of the valves appear to be stuck, and both ran until
the day the transmission jammed on the one. We got them to pop, but no such luck getting them to stay running. Now
neither wants to run.
I'm starting to wonder if they've decided between them to stay put! They can't because the property is due to be
flattened and developed, but try telling that to a stubborn old machine that's just lost it's family.
Fixed it, once I had a visual from another member and an extra set of hands from my dad. We regapped all the points and
plugs, replaced both condensers, and finally got spark at all cylinders. Needle in one carb was stuck, cleaned it out
(again). There is no gas coming out between the carb and the intake. I've got both set to the specs recommended by
several other VA owners. Timing checks out on both tractors. None of the valves appear to be stuck, and both ran until
the day the transmission jammed on the one. We got them to pop, but no such luck getting them to stay running. Now
neither wants to run.
I'm starting to wonder if they've decided between them to stay put! They can't because the property is due to be
flattened and developed, but try telling that to a stubborn old machine that's just lost it's family.
You won't see any gas coming out between the carb and intake. If it's leaky, it's an air leak INTO the intake, not something that pushes gas out. If the exhaust is clear (muffler interior not plugged or collapsed) and if all the valves are closing, then we're back at low compression, possibly, or a vacuum leak or the carb is just giving it too much gas prior to starting. Is this with the choke on? I imagine this is without the air cleaner hooked up or are you judging this by residual gas in the rubber air cleaner tube? If you have the tube off and are seeing gas FORCED back out the carb, that certainly sounds like a intake valve not closing to me. I'd also check all my wiring, plugs, whole ignition system again.
I thought you had one with a stuck engine.
I have two total, both VAO's, one from '47 and one from '49. I thought the engine on the '49 was stuck, but it turned
out to be stuck in a gear, which jammed the starter drive against the flywheel teeth when it backfired on a failed
start, so it was a relatively easy fix. The gas is coming out the opening for the air intake (I took the oilbath air
cleaners off to work on the carbs easier) It's not being forced out, but when I stop cranking the engine it dribbles
out. It doesn't affect the problem if the choke is full, half, off, anywhere. A couple folks have theorized that,
since it's not starting, the gas coming back out is what was in the manifold when I stopped cranking because it's
definitely getting into each cylinder, all the plugs are getting wet. I'm going to go back through the electrical
systems (condensers, plugs, points, coil) to check for spark and proper gaps again, then clean both float bowls and
all the jets and reset them again just in case I knocked something out of line at all. If that doesn't work, I'll
find someone with a vacuum tester who knows how to use one! The property they are on is being sold soon to
developers, and it's too muddy to pull them out with a truck at the spot they are sitting relative to the gate, so
I'm getting kind of desperate to get them moving under their own power!
out to be stuck in a gear, which jammed the starter drive against the flywheel teeth when it backfired on a failed
start, so it was a relatively easy fix. The gas is coming out the opening for the air intake (I took the oilbath air
cleaners off to work on the carbs easier) It's not being forced out, but when I stop cranking the engine it dribbles
out. It doesn't affect the problem if the choke is full, half, off, anywhere. A couple folks have theorized that,
since it's not starting, the gas coming back out is what was in the manifold when I stopped cranking because it's
definitely getting into each cylinder, all the plugs are getting wet. I'm going to go back through the electrical
systems (condensers, plugs, points, coil) to check for spark and proper gaps again, then clean both float bowls and
all the jets and reset them again just in case I knocked something out of line at all. If that doesn't work, I'll
find someone with a vacuum tester who knows how to use one! The property they are on is being sold soon to
developers, and it's too muddy to pull them out with a truck at the spot they are sitting relative to the gate, so
I'm getting kind of desperate to get them moving under their own power!
stevieb49829
Well-known Member
- Location
- Spirit Lake, Idaho
Are the needle and seat, and float working properly? Sounds like flooding on both carbs. With that much working on carbs and fuel lines its likely some debris is keeping the needle away from the seat enough to let fuel past. Or the float isn't adjusted enough to shut it off internally. Pull the bottom of the carb and make sure the float turns off the gas flow. Steve
Pulled one off last night, it definitely needed to be cleaned out again. I'm pretty sure all the running I've been doing while I tinker has continued to knock the crud loose and suck it into the carb. A wire brush and pick just doesn't get into all the nooks and crannys in a carb that have rust in them. Does anyone know a way/product that can get all the rusty crap out of the float bowl and other orafices without doing other damage?
For surface type rust you can use CLR or another acid product. It will clean it, and then you have to rinse it good and get some oilish protector on it. For the tiny passages in a carb, get a set of tip cleaners for an ox-acetelyne torch, should be found at most auto parts stores and TSC type places. Compressed air and solvent help a lot. It's a good idea to find a diagram of your carb so you can find the holes that might be plugged and covered with dirt, etc if it's been unrun for years.
There is a sediment bowl, not sure about a filter in the system. Certainly there isn't an in-line filter. The tank was
dry and empty when I started work on these. I went to O-Reilly's to ask about carb cleaning and bought what looks like
a gallon paint can with a mesh screen and a heavy-duty cleaner to soak the float bowl in. Going to try that next time I
have a free couple hours
dry and empty when I started work on these. I went to O-Reilly's to ask about carb cleaning and bought what looks like
a gallon paint can with a mesh screen and a heavy-duty cleaner to soak the float bowl in. Going to try that next time I
have a free couple hours
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