Wayne,
There is a good chance that you damaged the engine
I wouldn't start it without the blade, the it does act as a flywheel,
and the engine could overspeed easily without one installed. There are
several checks you can do though. First, remove the spark plug and
slowly turn the engine through a full 360 deg by hand. Are there any
tight spots? You will have more drag when the crank to connecting rod
are at 90 deg to each other. Next, tip the mower up and look at the end
of the crank while you turn the engine over. The shaft should stay
centered and not wobble. Usually the crank will get bent when hitting
something like this. If it isn't bent and not dragging, put a new blade
on and give it a try. If it is bent, there is an old method of
straightening the crank that I've seen done, but never used that may
work for you. Find a piece of steel pipe that will slide over the crank
and bend it back to where the end of the crank does not wobble. There is
no guarantee that it will work for long after straightening, but if you
want to take the chance, you can't wreck it any more than it is. I've
never heard of a crank breaking after being straightening, but I suppose
it is possible, so use it at your own risk. Now, back to your first
question. If everything seems OK you can block the butterfly so that the
engine won't try to run at full speed and try to start it, but only for
a short test.
Peace,
Pat
Thusly spake Wayne, On 7/16/2010 4:57 PM:
> Hi Guys,
> I have a simple MTD push lawn mower (that I use to mow around my shop)
> with a B&S engine and 22" blade. Today I nailed a small tree stump
> with it. Usually you just "graze" things and it somehow survives when
> you lift off it. Not this time. The engine stopped instantly. The
> tip of the blade, about 3" back, is bent 90 degrees downward!
>
> Is there any chance I damaged the engine? Is it ok to start it with
> the blade off, just to see if it runs ok? (don't know if it depends
> on the blade as a flywheel, or needs it as a load.)
>
> -Thanks, Wayne
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--
Pat Horne, Owner, Horne Systems
(512) 797-7501 Voice 5026 FM 2001
Pat@HorneSystemsTx.com Lockhart, TX 78644-4443
www.hornesystemstx.com
-- We support Habitat for Humanity - a hand UP, not a hand OUT --
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