Tecumseh 8 HP Over Reving all of Sudden - Snowblower Forum : Snow Blower Forums
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post #1 of 12 Old 12-09-2019, 03:45 PM Thread Starter
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Tecumseh 8 HP Over Reving all of Sudden

Hello All

Tecumseh HMSK80 155487S

The Guy across the Street was snow blowing my driveway for me while I was away on a trip. All of a Sudden the engine started to Over Rev.

No warning did not touch anything just happen.

I can work on Small Engines so tried over the phone to help him - He removed the Carb cover and could not find anything that Looked Broken or Disconnected from the outside.
Or snow packing someplace.

Since we had 22" Snow fall and needed a snowblower we went and purchase a new one.

I came home yesterday and went to look at it. As soon as you start it with the Throttle in Full Run it over revs right away. If you lower the throttle to the bottom it seems to run normal idle and sits there running Ok. Have looked at Videos and Read posts - see a lot on over revving - most are from people changing Carbs and not installing linkage correctly or adjusted the Governor incorrectly. Can find nothing on this Happening all of Sudden.

What do you think can cause this to happen all of Sudden? Besides Governor Failing inside engine - if that did happen is there a way to check from outside.

Want to try and eliminate all springs and linkages before opening the engine to check governor inside. Did not see anything that looks wrong or broken.
Checked round spring on Throttle it is there and works. I seen one video on tighten that spring tighter but do not know how this can make Rev all of Sudden.

Was thinking to remove the engine oil and look at it to see if find any metal or plastic that may come from inside governor. I heard the gear is plastic and can break in pieces.

Any help would be appreciated

Thank you
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post #2 of 12 Old 12-09-2019, 03:49 PM
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Any chance you can shoot a photo or 3 of the throttle-carb-governor linkage and post?

I will say that if really truly nothing was done to the engine and the problem appeared out of nowhere, it's likely the governor broke inside the engine. Those plastic gears are getting pretty old! If it broke you might find pieces in the oil, but they alsod may be large enough that they can't fit through the drain hole.

Another possibility that comes to mind is the governor arm slipped on the little shaft that comes out of the engine. I think if you google or look around youtube there are some videos that show how to adjust that arm on the shaft.

Oh and specifically to the point of testing the governor, there's really no specific way to do that. It's more a process of elimination... if the linkage is installed and adjusted correctly, the governor pretty much has to be the problem.

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post #3 of 12 Old 12-09-2019, 04:02 PM Thread Starter
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As soon as can get pictures will post - not sure when he will be home so can get to it. I know how to adjust governor linkage will do that too before re-posting pictures.


Thanks for help
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post #4 of 12 Old 12-09-2019, 05:13 PM Thread Starter
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Talked with him and he said he was going into heavy snow so was loading the engine up when happen and revved up.
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post #5 of 12 Old 12-09-2019, 05:18 PM
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Donyboy73 video on over-revving Tecumseh:

2016 Ariens Professional 28
2017 Toro Power Clear 721R
2018 Simplicity Select 1024
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post #6 of 12 Old 12-09-2019, 05:25 PM
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Originally Posted by Mike Smith View Post
Talked with him and he said he was going into heavy snow so was loading the engine up when happen and revved up.

Sounds like the gov took a dump
or the set screw holding it tight is loose
readjust gov it takes 5 min there are vids on you tube if you have never done it
the arm should be slightly towards carb when adjusted right with the throttle on full
there are 2 ways to adjust it make sure you understand it
if still revs,and the carb linkage isn't farked up
the gov took a dump
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post #7 of 12 Old 12-09-2019, 06:31 PM
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Mike: in your 2nd pic, is there a spring hanging from the linkage assembly that is attached to the shroud?

Paul
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1980 Toro 421, 1995 Craftsman 524
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post #8 of 12 Old 12-09-2019, 06:37 PM
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Originally Posted by paulm12 View Post
Mike: in your 2nd pic, is there a spring hanging from the linkage assembly that is attached to the shroud?
Le

I see no spring you mean the throttle cable
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post #9 of 12 Old 12-09-2019, 06:42 PM Thread Starter
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This snowblower has a Throttle Control on the front panel between handle bars - it does not have a leveler with red knob to control speed



I think you see the wire and the cover ( looks like spring) that goes to the throttle.


Click on the picture you may see better - if not that I do not see what you see


Thanks
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post #10 of 12 Old 12-09-2019, 06:50 PM
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Quote:
Originally Posted by Mike Smith View Post
. . . Governor Failing inside engine - if that did happen is there a way to check from outside. . . .
here's how to get a clue of the condition of the internal governor (and how to reset gov arm)

1986 Toro 524 (Predator 212 Hemi, Impeller Mod.)
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1997 Toro 824XL Power Throw
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