Tecumseh HS50 too much compression? - Snowblower Forum : Snow Blower Forums
 
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post #1 of 8 Old 10-29-2019, 02:42 PM Thread Starter
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Tecumseh HS50 too much compression?

Hey there, new to the forum and looking forward to hear what you say!

I have a older Noma 523 on tracks, I bought it off a guy who was having troubles with it and I thought I could fix it up and have a solid blower. Unfortunately not the case. It had no compression so I replaced the head gasket and now has 160psi?? I replaced the carb and still having the same issue. It will fire a few times and die, hit the electric start and fires a few times and dies again. Has strong spark and spark plug looks like its in good shape. Where do I look next? does that compassion seem abnormal high?

Thanks a lot!!
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post #2 of 8 Old 10-29-2019, 05:49 PM
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Welcome to SBF Mike. Did you happen to check the valve clearances before changing the head gasket? If the clearance is to big on the exhaust valve, the cam shaft has a compression release that slightly opens the exhaust valve to lower the compression for easier starting.


If the clearance is in the .006 thousandths range, it is ok. If the clearance is around .015, the compression release won't activate. Another possibility, the camshaft has a broken compression release and isn't making starting easier.


I'm guessing that a good compression reading, with a good compression release and valve clearances would be around 60 psi?

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post #3 of 8 Old 10-29-2019, 07:51 PM
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have you removed the float bowl to check and see if there is any other crud in there that may be preventing it from running?

arien 520 snow blower 6.5hp swap
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post #4 of 8 Old Yesterday, 11:19 AM Thread Starter
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Thanks for the help! Turns out the fly wheel key was broken and the timing was off just a bit so I would not stay running. Now to figure out why it broke.. when I try to pull it over there is a lot of resistance, so I will check the valve clearance and go from there. Also the governor seems to be non existant, doesnít matter how it is set it will over rev everytime. Iím almost thinking something is wrong with the cam shaft/ internal governor parts. Any thoughts? Appreciate the feed back!
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post #5 of 8 Old Yesterday, 11:37 AM
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For 99.00, just slap a Predator on there and be done with it ….
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post #6 of 8 Old Yesterday, 02:27 PM
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Quote:
Originally Posted by oneacer View Post
For 99.00, just slap a Predator on there and be done with it Ö.

Unless he has a two shaft engine, which is quite possible on an older machine.

Toro 8/24 (38080) 1989
Toro 721-QZR (38743) 2015 (Hemi Predator Power)
Toro 421-E (38585) 2008 (New Owner)
Experience is something you don't get until just after you need it.
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post #7 of 8 Old Yesterday, 02:34 PM
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Quote:
Originally Posted by Mike Gruben View Post
Thanks for the help! Turns out the fly wheel key was broken and the timing was off just a bit so I would not stay running. Now to figure out why it broke.. when I try to pull it over there is a lot of resistance, so I will check the valve clearance and go from there. Also the governor seems to be non existant, doesnít matter how it is set it will over rev everytime. Iím almost thinking something is wrong with the cam shaft/ internal governor parts. Any thoughts? Appreciate the feed back!

A sheared flywheel key on a snow blower motor is pretty RARE. The seller may have tried fixing the motor and never torqued the flywheel nut to correct spec or the valves being out of adjustment caused a backfire and it sheared.

Toro 8/24 (38080) 1989
Toro 721-QZR (38743) 2015 (Hemi Predator Power)
Toro 421-E (38585) 2008 (New Owner)
Experience is something you don't get until just after you need it.
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post #8 of 8 Old Today, 11:31 AM Thread Starter
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Originally Posted by oneacer View Post
For 99.00, just slap a Predator on there and be done with it Ö.
Thatís no fun! Some quality time in the shop, learning new things. Iíll post back when I have the time to dig a little deeper.
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