How difficult is it to replace a flywheel on a Tecumseh vertical shaft
engine and are any special tools needed? We have one which has a couple of
bad sections of gear teeth (used by an electric starter). I have no idea
why as the starter gear is plastic.
I'm presuming the gear teeth are integral to the flywheel and therefore
metal, unless they somehow add a ring around the outside with the teeth on
it. (That would help explain how it could be damaged.)
I can go fetch the engine model number if need be though I think most of
these engines are very similar. It's on a Lawn-Boy walk-behind mower.
On Tue, 19 Apr 2011 09:21:28 -0500, Steve Kraus wrote:
Could be debris getting in there and shearing them off - or someone
wedged the flywheel with a screwdriver while trying to remove whatever's
at the other end of the engine (blade, presumably) and sheared the teeth.
I suspect it's a case of undoing an single bolt and gently easing the
flywheel off (where 'gently' might mean a few taps with a cloth-wrapped
I suppose it's possible that replacement teeth could be welded on and
fashioned into shape with a grinder, which might be less expensive than a
whole new flywheel (and could be done in-place) - it'd wear the plastic
starter pinion faster than by design, but I think they're only a couple
of bucks normally.
Hold the flywheel up with a screwdriver/pry bar, and rap the end of the
crankshaft with a hammer. If the threads on the crankshaft go to the end,
you'll want to screw on a coupling nut so as not to mash the threads (they
sell a tool for this if you insist).
I made a flywheel puller for my Tecumseh by drilling three holes in a
piece of 1/4" steel plate so that the holes lined up with the holes in
I threaded nuts onto the bolts, slipped them through the plate and
tightened them into the threaded holes in the flywheel. A few turns of
the nuts and the flywheel pulled right off.
Loosen the flywheel nut, put a couple of levers under the flywheel
to pull it up, then smartly crack the top of the shaft with a (brass)
hammer, and the flywheel should pop off the taper. There are puler
tools available as well, but I've had just as good luck with the
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