Carb problem, surging after ultra sonic, enlarge holes behind Welch? - Snowblower Forum : Snow Blower Forums
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post #1 of 20 Old 01-21-2019, 09:26 PM Thread Starter
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Carb problem, surging after ultra sonic, enlarge holes behind Welch?

I have a Tecumseh 8hp on a 15 yr old snowblower that was given to me. The carb has a fixed plug on the bottom holding the fuel bowl on and a low speed adjustment on the side. When I got it, the engine was surging badly that it was unusable. I cleaned it in my new ultrasonic cleaner for 60 minutes using the manufacturers recommended $65/gal Carburetor Shellac and Varnish Buster, the side Welch plug was removed, after cleaning then a dunk in a water bath then immediately every hole was cleaned using a welder's tip cleaner. New Welch plug, sealed with nail polish, let dry for a day, reinstalled and no difference with the surging.

I The did it again, removed the carb, disassembled, Welch plug removed, in my ultrasonic cleaner a second time using Berryman's Carburetor Cleaner dunk tank as the solution, removed after 30 minutes? 60 minutes? I forget which. cleaned every hole using the tip cleaner, then I cleaned every hole using wire gauge drill bits, then new Welch plug, sealed, next day installed, still surging, No difference.

I was thinking of doing the ultrasonic cleaner again for 30 minutes, then spraying carb cleaner in every hole, then tip cleaner, then wire gauge drill bits. Then should I install it? Or should I enlarge each hole behind the Welch plug using the next size larger wire gauge drill bit? Would enlarging these holes help with the surging?

I don't want to give up and install a Chinese carburetor. I want to learn what is necessary to solve the problem for my future knowledge.

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1995 Murray Craftsman 10hp, 29" w. 12" impeller
A 1983 Real John Deere 10hp, 32" w. 12" impeller, 16" auger, 20" high front, cast iron gear box, chains
Noma 9hp, 27" w. 12" impeller
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Gravely Convertible, 12hp Kohler cast iron, 26" width, 600 lbs of cast iron & steel, 2 speed impeller, 4 ground speeds
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post #2 of 20 Old 01-21-2019, 09:34 PM
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what is the part number of the carb? and the engine? I will see if I have worked on one of these. And no, I would not clean again, nor enlarge the jets. Seems like they should be clean by now, something else is going on.

and I agree with you about wanting to understand the issue, not just get it running. I do the same.

thanks

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post #3 of 20 Old 01-21-2019, 09:35 PM
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More ultra sonic cleaning isn't going to help. 15-30 minutes is all you should need. Which cleaner is it? After 30 minutes more isn't better. Could be an intake leak. ALSO, could be the gaskets. I don't know which carb it is, but many carbs have multiple gaskets that come with it, putting the wrong gasket in the wrong place, will do that.



Make sure all the gaskets are positioned correctly, and in the right place. They have four positions each, and try again. They can be confusing, and I'll admit, kicked my butt once, maybe twice.




Berryman's is very toxic. Rated 3rd to Lucas and Gunk. I use Gunk, I left a really bad bowl I threw in the USC, didn't turn on the USC. The next day, the bowl was almost spotless without even running the USC.

Last edited by jsup; 01-21-2019 at 09:49 PM.
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post #4 of 20 Old 01-21-2019, 10:01 PM
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If this is a typical Tecumseh carb, the passages behind the side welch plug are idle, not main, and likely have nothing to do with your problem. Look at the main jet, the main needle (if there is one), and the emulsion tube (if accessible).
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post #5 of 20 Old 01-21-2019, 10:11 PM
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“Fixed plug on the bottom” so non adjustable jet... may just need a richer mixture. You can enlarge the orifice or install just the adjustable jet.

Add a little bit of choke and verify.

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post #6 of 20 Old 01-21-2019, 10:49 PM
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is there excessive play in the throttle shaft?


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post #7 of 20 Old 01-21-2019, 11:45 PM
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Check the governor regulator spring. The one that goes from teh governor to the carb.
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post #8 of 20 Old 01-22-2019, 08:37 AM Thread Starter
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No excessive play in the throttle shaft. Not the carb intake gasket as I sprayed starting fluid there with no change.

I'll loosen and redo the governor spring.

Can I replace the fixed jet with an adjustable jet? Is there enough room for the needle? I'll check my stock and look at my extras.

1986 Ariens ST522, 5hp, 22"
1995 Murray Craftsman 10hp, 29" w. 12" impeller
A 1983 Real John Deere 10hp, 32" w. 12" impeller, 16" auger, 20" high front, cast iron gear box, chains
Noma 9hp, 27" w. 12" impeller
Noma 5hp, 24" w. 12" impeller, 20" high front
Gravely Convertible, 12hp Kohler cast iron, 26" width, 600 lbs of cast iron & steel, 2 speed impeller, 4 ground speeds
Dynamark 8hp, 26", 12" impeller, for sale
Several other 5hp, 8hp, several 2 cycle, all for sale
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post #9 of 20 Old 01-22-2019, 08:48 AM
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Could be that the last owner disturbed the governor adjustment.
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post #10 of 20 Old 01-22-2019, 09:19 AM
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Quote:
Originally Posted by jsup View Post
Check the governor regulator spring. The one that goes from teh governor to the carb.
This is my guess too, or possibly the linkage was installed in the incorrect hole sometime in the past?

Joe

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