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Toro Snowthrower Problems Again


deerefan's Avatar
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10-20-08, 11:29 AM   #1  
Toro Snowthrower Problems Again

i have a toro with a 7hp tecumseh
and i just cleaned and rebuilt the carb with the kit
but i can't seem to get it to run right
the motor vibrates but i don't hear any knocking
i mean the chute handle will spin around and around
i adjust the idle screw first at low speed and then
i move it to full throttle and adjusted the main screw
but vibration is still there
what could cause the vibration?
it wasn't there before i rebuilt the carb
the carb was very dirty and would not run on open choke
any help?

 
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WML13's Avatar
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10-20-08, 06:14 PM   #2  
Toro Snow Thrower

Did you take the Cylinder head off and check the valves?

 
deerefan's Avatar
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10-21-08, 06:23 AM   #3  
i wouldn't know how to work on these things
you think it's the valves ?
i hear it could be a bent crank,
is anyway to check this?
i paid $150 for this machine and really can't afford to spend too much more

 
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10-21-08, 12:37 PM   #4  
Are you getting any black smoke out the exhaust?

I doubt that the crankshaft would be bent. If there was no vibration prior to the carburetor work, perhaps it's just running rich, or possibly the ignition may be cutting out. A bad spark plug could cause this or a problem with the ignition.

Have you tested the spark or replaced the spark plug?

 
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10-21-08, 01:23 PM   #5  
no black smoke and i replaced the plug
i don't think the crank is bent either
how to tell if the ignition is bad?
i don't know if this will help but when i started the engine
for the very first time when i got it home
the pull cord retracted back hard, pulling me with it
this only happen once but seems normal now


Last edited by deerefan; 10-21-08 at 01:32 PM. Reason: forgot to add
 
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10-23-08, 06:05 PM   #6  
I agree it is most likely not a bent crank, rare in a snowblower. It does sound like you have a partially sheared flywheel key. You may not have noticed the vibration prior to carb work as engine may not have been reaching proper RPM's. Sheared flywheel key disrupts timing and can cause vibration and cord retracting as you mentioned

 
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10-24-08, 06:31 AM   #7  
thank you smallengineguy and 30yeartech
yesterday i removed all of the belts from the pulleys to see if something else was causing the vibration, but it was still vibrating
is the key easy to replace? machine is toro 724 model 38072 from 1995 engine HSSK 70

 
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10-24-08, 08:19 AM   #8  
Flywheel Key

Best to use a flywheel puller, but you can get away with a big gear puller if you know what you are doing. Keys are cheap, flywheels are not.
Take the head off and look at the valves.

 
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10-29-08, 06:53 PM   #9  
took it to the shop
they told me the engine wouldn't run at all
with a sheered key after i told tecumseh tech it might be a sheered key so after a few days he said it was a sheered key that cause the vibration
my toro runs great


thanks guys for your help

 
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10-30-08, 08:38 AM   #10  
Sheared Flywheel Key

Well Since you knew it WOULD run with a partially sheared flyweel key, how did you take it when the shop said it would'nt? You don't have to tell me, but was the key all they billed you for on the repair order? Anyway, if all you need now is snow I'm glad to hear it!

 
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10-30-08, 10:37 AM   #11  
i just said maybe it's sheered key might be causing the vibration as smallengineguy said
and surly enough it was
they charged me total $68 bucks
i don't have any puller tools on hand to do the job
but anyway i,m happy

 
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