Tecumseh 10 hp
I have an older model Craftsman snowblower 10 hp 30" cut . It will start great but after about an hour of blowing snow the engine starts to miss and it stalls. I let it sit for 15 minutes and it starts and runs fine for about 30 minutes and then does the same thing.Any ideas what could be the problem or where to start to find the trouble?
Last edited by Albert279; 01-02-2015 at 01:26 PM.
I would suspect that the gas cap is sealing off and causing a fuel starvation issue. That of course assumes everything else is functioning as it should. And it's the simplest place to start.
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Test the cap by running until it stalls, then loosen the cap. If it runs fine again, then that's the problem. You can fix it with a new cap. BUT another way is to take the current cap and heat a SMALL sewing needle until it glows. Now pick a spot near the center of the cap and pierce (melt) a tiny hole. I've not had any problems since and no water in the gas since the hole is so small.
Last edited by CO Snow; 01-02-2015 at 02:27 PM.
test the ignition to, keep a spare spark plug in your pocket and test for spark as soon as it stalls. on the older tecumseh gas caps, they had a metal dish inside to help them vent. if that dish falls off(it happens from vibration), it wont vent properly. dont bother removing it if its inside the tank, you will not be able to get it out and it wont effect the functionality of the tank
this is the revised cap
this is the old style cap
this is the old style cap
Hello and welcome to the forum Albert. As suggested, try the gas cap first. Being an older machine, another possibility is the valve stems are expanding from engine heat and preventing the valves from closing all the way causing a loss of compression which is actually a very common problem on flat head engines. There are numerous videos on youtube describing how to check the valve clearances and adjust them if necessary. If you are willing to get your hands dirty and have some mechanical ability, you can do it yourself. Here is a link to the engine service manual if you decide to try it yourself. Any questions, there is always someone here willing to help if needed.
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One other thing with those big Tecumseh's. They can have a tendency to run poorly when the gas tank is low. Its a strange phenomenon, I have found this to be true. I also usually set the float on the high side, to make sure theirs a good volume of gas in the bowl.