New Carb leaking - Snowblower Forum : Snow Blower Forums
 
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post #1 of 9 Old 12-22-2015, 12:00 PM Thread Starter
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New Carb leaking

I just installed a brand new Oregon 50-642 on my Tecumseh HMSK80. It is leaking gas from the main adjustment screw on the bottom of the bowl. The bowl is dry and its not leaking from the fuel hose (I closed the fuel shutoff valve).

Any thoughts (besides return it)?
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Last edited by Cubby; 12-22-2015 at 12:07 PM.
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post #2 of 9 Old 12-22-2015, 12:24 PM
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to the forum Cubby


Have you tried removing the bowl and then checking if there's an O ring missing, cut, twisted ...


This is from a briggs:

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Make sure the windows are up before the snow plow goes by !!

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post #3 of 9 Old 12-22-2015, 12:30 PM Thread Starter
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I took it out and there is an o-ring and the gasket. I flipped the or ring over and re-installed. I will keep and eye on it.

Update - still leaking. I will get a new o ring for it.

Last edited by Cubby; 12-22-2015 at 03:00 PM.
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post #4 of 9 Old 12-24-2015, 05:54 PM
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Mine's having the same issue. I'll have to get a slightly smaller O-ring for the carb and try it.

1971 Ariens 922002 (sold)
198x Toro 3521 with Predator 212 and tall chute
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post #5 of 9 Old 12-24-2015, 11:15 PM
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Try seeing if you can find a Viton O ring in the right size. They hold up much better.....



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post #6 of 9 Old 01-03-2016, 03:11 PM
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Another thing to consider is that the threads make a fairly poor sealing surface. Putting some epoxy or other gas-resistant stuff onto the lower-most threads where that O-ring rides to make a smooth surface might help it seal better. The original adjustment needle on my Tecumseh carb has a smooth area for the O-ring to seal on. The replacement has threads in that area. The replacement was impossible to seal, so back to the cleaned-up original main jet adjustment needle it was.

1971 Ariens 922002 (sold)
198x Toro 3521 with Predator 212 and tall chute
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post #7 of 9 Old 01-03-2016, 04:45 PM
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As sciphi said you may have better luck reusing the original needle. The o-ring needs a flat surface on the face and a smooth surface on the ID. If there are threads for it to seal against on on the ID you are asking too much from a conventional o-ring. I doubt a new o-ring will solve the problem. Make sure the bowl is relatively flat on the mating surface and there is not debris present. The spring needs to have ample tension too!

good luck.

Current machines
Ariens 926LE

Yard Machine 22" upgraded with 6.5 HP Predator
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post #8 of 9 Old 01-07-2016, 10:19 PM
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Post #2 illustrates the issue I had nicely. The O-ring has to seal against the solid area on the adjusting needle. If it's not available, it can be made, or the original re-used after cleaning.

1971 Ariens 922002 (sold)
198x Toro 3521 with Predator 212 and tall chute
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post #9 of 9 Old 01-09-2016, 09:34 AM Thread Starter
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We haven't had snow in 3 weeks so I have been ignoring the snowblower. Its -27 C right now so I will wait for warmer weather to check the bowl and all mating surfaces.
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