[Shop-talk] Mower blade orientaaion relative to piston

[Bob Spidell]

Possibly of some interest: I had a Craftsman walk-behind that quit 
running suddenly. I tore the engine down, didn't find anything, then 
finally took it to a repair shop. They told me the blade had a crack in 
it that caused the problem; supposedly the blade is part of a timing 
loop that fires the spark. Sort of makes sense if you think of the blade 
as a flywheel with a position sensor on it.

Bob

On 5/18/2021 2:55 PM, Brian and Wendy Warrick wrote:
> I run Snapper walk behind mowers and have never gave it a thought. I 
> can't see why it would matter. If it did, they would have designed the 
> adapter differently.
>
> Brian
> Nampa, ID
>
> ------------------------------------------------------------------------
> *From:* Shop-talk <shop-talk-bounces at autox.team.net> on behalf of Karl 
> Vacek <stearman809 at gmail.com>
> *Sent:* Tuesday, May 18, 2021 3:52 PM
> *To:* 'shop-talk at autox.team.net' <Shop-talk at autox.team.net>
> *Subject:* [Shop-talk] Mower blade orientaaion relative to piston
>
> Last time I sharpened my 21” walk-behind mower blade I thought of 
> something that’s never occurred to me, after using the same brand of 
> mower for 25 years..
>
> On a Snapper, the blade can actually go on any way onto the square 
> adapter keyed to the crankshaft.  The mounting point is square, no 
> pins, no longer side, nothing.
>
> One way would be aligned with the cylinder at TDC/BDC, and the other 
> way would be across.  It’s been off many times and there’s no way to 
> tell how it was mounted originally. The manual is silent on this.
>
> Power stroke shouldn’t matter, but maybe some dynamic issue one way or 
> the other?
>
> Thanks!
> Karl
>
>

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