MTD Snow Kind w/Tecumseh LH318SA-156554H - Snowblower Forum : Snow Blower Forums
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post #1 of 20 Old 05-17-2018, 10:26 PM Thread Starter
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MTD Snow Kind w/Tecumseh LH318SA-156554H

Tecumseh LH318SA-156554H
Start the motor on full choke, go to no choke, and it will overrev.
Adjusted both throttle screw and carb idle screw-no change
Adjusted throttle adjustment bar-all the way in, all the way out-no change
Adjusted linkage (bent)- no change

Is there something I am missing? Both the carb and the throttle are oiled and in good working condition where they respond to movement. It constantly overrevs no matter the situation.

What should I do? I bought this on a need to have, and now it isnt running right.
Help please!
Brian
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post #2 of 20 Old 05-17-2018, 10:40 PM
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It could be a few things, I have a 5hp that does similar that the governor may need replacing but that one also does not speed up when loaded so the governor does not seem to working but yours could also have a air leak some place causing a lean situation making it rev.

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post #3 of 20 Old 05-17-2018, 10:53 PM Thread Starter
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Pretty handy, dont mind a governor replacement. How difficult is that, and is it cost effective (or how would you test other than the way I am if a governor needs replacing?)?
How can I search for an air leak?
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post #4 of 20 Old 05-18-2018, 06:36 PM
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A Harbor Freight Predator 212cc will fix that.
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post #5 of 20 Old 05-19-2018, 07:51 PM
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if this is a 5 HP TEC, have you checked the linkage on the throttle and governor to insure they're hooked up correctly along with moving as they should?
That's where I'd start: insure they're correct and they move correctly. I did find a couple of pictures of a 5 hp I rebuilt and hopefully it might help such that it is.
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post #6 of 20 Old 05-21-2018, 12:16 AM Thread Starter
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It is a Tec. 8 hp, 2006 build year it looks like.
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post #7 of 20 Old 05-21-2018, 12:19 AM Thread Starter
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As a point of reference, even when I push towards the motor on the governor lever, so that would be towards a lower RPM, it really does not go low unless I press relatively hard on the lever, but even when you push without much force, it does not slow the motor down. That makes me think that it could be a governor issue inside....but, if I knew, I would not be asking!!
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post #8 of 20 Old 05-21-2018, 07:21 AM
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Is it safe to say that the engine HAS NOT been disassembled at all recently, and that there's NO possibility that someone pulled the Oil Pan and didn't put the Mechanical Governor's Gear Shaft back together quite right ?
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post #9 of 20 Old 05-21-2018, 12:36 PM Thread Starter
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Pulling the pan

Quote:
Originally Posted by Vermont007 View Post
Is it safe to say that the engine HAS NOT been disassembled at all recently, and that there's NO possibility that someone pulled the Oil Pan and didn't put the Mechanical Governor's Gear Shaft back together quite right ?

I can not confirm that. In the 3 months I have owned it, I have not. However, who knows about the previous owner. It had run rough, so I cleaned out the carb and it runs smooth, other than the overrev issue. How would you recommend making sure it "goes back together right" if I pull the pan?
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post #10 of 20 Old 05-21-2018, 01:46 PM
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maybe un-hook the throttle from the governor and manipulate the throttle by hand. if you can control the rpms by hand then you know it is not a carb issue and it is a governor linkage or governor issue
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