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Registered
Join Date: Apr 2001
Location: Linn County, Oregon
Posts: 48,886
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Quote:
Originally Posted by Rot 911
Your mower, like most mowers, should have a Woodruff key at the end of the crank where the flywheel (pull cord) attaches. The purpose of the Woodruff key is for it to sheer off when the mower blade strikes an unmovable object. It’s possible that you only partially sheered the Woodruff key and the timing is off just enough to produce the knock you are hearing. I would at least check that before I started tearing the engine apart. Plenty of YouTube videos showing you how to replace the Woodruff key.
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Bingo! New blade, new woodruff key and you'll be fine...my thought as well. In an earlier life, I worked on mowers. 95% of the time, that's all that was needed.
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"Now, to put a water-cooled engine in the rear and to have a radiator in the front, that's not very intelligent."
-Ferry Porsche (PANO, Oct. '73) (I, Paul D. have loved this quote since 1973. It will remain as long as I post here.)
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