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Gas flow in WD45 carb - manifold stud question

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Vic Lovejoy

03-21-2004 11:46:41

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Can anyone point me to a diagram/description of the gasoline flow in a Marvel/Schebler WD45 carb? I've had mine apart and put it back together but I'd like to really understand how it works.

I've still got the problem with the engine dying when I push in on the choke. I was able to drive it yesterday (to move it away from the garage) and it runs OK with the choke closed.

Could a problem with the electrical system (someone has mentioned the coil or points/condenser may be bad) create that problem?

Also, I'm replacing the manifold gaskets and have found that one of the studs has no threads on the end (in fact they were all just finger tight - on one of the studs someone has put a nut on it and allowed the threads to catch, but for about 1/2 inch there are no threads.).

Does it require a special metal or anything for the studs? Could a person use a bolt to replace the stud?

Any info on either of these issues would be great.

vic

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Steve in N.J.

03-21-2004 19:06:30

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Re: Gas flow in WD45 carb - manifold stud question in reply to Vic Lovejoy, 03-21-2004 11:46:41

Vic,
If the manifold is loose on the engine, it's possible you have a huge vacuum leak, and the only way the engine will run is if you slam the choke closed to make it run richer to compensate for the vacuum leak. Also, as far as the carb, we do a lot of carb rebuilding, and I've found that because these old carbs are cast iron, over the years water gets in them and the enrichment ports plug solid with rust and muck. If you didn't know they were there, you'd never see em' especially on the Marvel/Schebler's. They seem to be more troublesome than the Zenith equipped WD's. The only way I've found to get those passages clear and clean is glassbeading out the muck and rust after running a probe to open them first. You could make a career out rebuilding one of those, but if you don't clear the lower enrichment passages, they'll never work correctly. HTH
Steve/B&B Custom Circuits

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Linda Maly

03-31-2004 12:09:11

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Re: Re: Gas flow in WD45 carb - manifold stud ques in reply to Steve in N.J., 03-21-2004 19:06:30

In need of a coil for model C Allis chalmers tractor part # G2477

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Vic Lovejoy

03-22-2004 04:20:24

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Re: Re: Gas flow in WD45 carb - manifold stud ques in reply to Steve in N.J., 03-21-2004 19:06:30

Steve, I have ordered a carb rebuild kit and a manifold gasket set. I've gotten the rusty manifold nut loose.. found out that the stud is coming out of the block, and antifreeze started pouring out. I'll just drain the antifreeze so I don't have to worry about that. It just good to know that all the studs or nuts came off so I can replace the gaskets (you should see the caulking, etc., that's been put on over the years). My lovely wife noticed the other day that there was a real hissing sound when the engine was running -that's probably the vacuum loss.

I'm also going to tank the carb casting in parts cleaner and hope that clears the gunk out. I just need the tractor to run good this summer for bush hogging, and hopefully to use it this winter for moving hay bales.

It's going to be worth it if it runs good and we get good use out of it.

Any ideas on carb flow diagrams would be appreciated.

vic

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wdTom

03-21-2004 17:50:35

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Re: Gas flow in WD45 carb - manifold stud question in reply to Vic Lovejoy, 03-21-2004 11:46:41

I made studs from stainless rod and bolts that I had around. I guess they won't rust anymore. Used stainless nuts and washers too. I cut the threads in my lathe, butI guess they could be cut by a sharp die too, if you don't have a lathe or friend with a lathe.

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old

03-21-2004 16:58:17

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Re: Gas flow in WD45 carb - manifold stud question in reply to Vic Lovejoy, 03-21-2004 11:46:41

You still have a carb problem, did you remove the brass tupe that goes down the center of the carb? If not that is where the problem is and if you did its still in that area that tube is where the engine gets its gas from and if its clogged or has a lot of rust in the bottom it slows down the flow.

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