What makes an engine stall under load? - Snowblower Forum : Snow Blower Forums
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post #1 of 38 Old 01-26-2015, 05:15 PM Thread Starter
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What makes an engine stall under load?

Craftsman 22" with Tecumseh 12 cu in engine, series 1 carb.

My brother and I both have identical Craftsman snow blowers with the same problem. They start and run but when engaged to throw snow they die.

Mine is about 15 yrs old with a new carburetor (eBay), adjustable main and idle jets. I've owned it since new and it's only been the last few years that it has given me trouble. His is newer with the non adjustable carb.

We've been through the cleaning procedures and both carbs are spotless. We're at the end of the rope here, with major snow headed this way.

What is the likely culprit?

TIA
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post #2 of 38 Old 01-26-2015, 05:19 PM
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some one will be along here to answer that question. I never run or mess around with those engines. so anyways ALOHA from the unfrozen TUNDRA.:ee k:

Long LIVE THE POWERSHIFT!! MAY IT NEVER RUST IN PEACE!!
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MAHALO!!!!!!!!!
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post #3 of 38 Old 01-26-2015, 05:36 PM
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older L head techumseh engines have a bad habit of the exhaust valve recessing in the valve seat and loosing valve lash. When the engine gets up to operation temperature the valve lengthens just enough to hold the exhaust valve open causing a loss of power. This among many other things could be an issue.

Make sure the gas tank is vented, you have good spark, and you already said the fuel system is working correctly. make sure you have good fuel delivery to the carb.
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post #4 of 38 Old 01-26-2015, 05:58 PM
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are you able to test compression?


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post #5 of 38 Old 01-26-2015, 06:26 PM
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Yes. Exhaust valves tend to get out of adjustment as well as the carburetor s are really finicky. To fix Exhaust remove head and using a wire brush remove carbon from valves. Pull the door to the valve spring area and using a valve keeper removal tool pull valve keeper clip and the pull valve out. To fix you usually grind off a small amount of stem until clearance is correct when measured from the cam lob tappet to the valve stem. Also you need to lap the valve too to make sure it is seated correctly. If valve is damaged replace valve and grind to right length and lap to cylinder.
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post #6 of 38 Old 01-26-2015, 09:40 PM
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Or maybe your machines are just running lean.....try running it with the choke on just a bit.....if this helps.....open your main needle valve just a bit, very small bits at a time.

His is newer with the non adjustable carb, more likely to gum up....may need to be cleaned by soaking in carb cleaner.
Good luck
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post #7 of 38 Old 01-26-2015, 09:53 PM
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Something else to check.
Mine was sucking in air through the plastic fitting the goes into the carb. Did they same thing, as soon as I went into the snow it died.
Funny thing was that the fitting didn't leak gas until I finally wiggled it around, then I saw the crack.
Do you have the plastic fitting on yours?

Check the condition of the fuel line itself too.
Bad venting on the cap as mentioned.

I hate shoveling SNOW!
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***********************
Craftsman #536886141(Around 2000?)
5 Horse, Tecumseh HSSK50-67392S
22" Dual Stage
***********************
"Classic" 1963 S-226 Snowbird
4 Horse (orig) Briggs & Stratton#6305201
22" Dual Stage
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post #8 of 38 Old 01-26-2015, 09:59 PM
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When you say this, "They start and run but when engaged to throw snow they die."

Does it die, just when you engage the auger?
Or when you engage the auger and go into the snow, then it dies?

I hate shoveling SNOW!
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***********************
Craftsman #536886141(Around 2000?)
5 Horse, Tecumseh HSSK50-67392S
22" Dual Stage
***********************
"Classic" 1963 S-226 Snowbird
4 Horse (orig) Briggs & Stratton#6305201
22" Dual Stage
***********************
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post #9 of 38 Old 01-26-2015, 10:00 PM
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Quote:
Originally Posted by dave c View Post

What is the likely culprit?

Tia
the load!!!


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post #10 of 38 Old 01-26-2015, 10:12 PM
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Quote:
Originally Posted by Coby7 View Post

the load!!!
I'm fairly certain the OP is looking for a culprit within the spectrum of his snowblower.

Try pulling the plug and checking to see what the fuel mixture is doing in the chamber.
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