It walks you through the whole process step by step, from checking the shear-key, tapping & removing the flywheel, fitting the shear-key, torquing the flywheel, and setting the armature air gap. Remember Snow engines are not equipped with element air cleaners. pto shaft - Replacement engine is Tecumseh part 907364A. If you need video help, check out “Shear-key replacing video”. cast iron cylinder sleeve - recoil & 220 volt electric start (no cord) - MTD style crankshaft - crankshaft 35975 (click to view)- 3.25' long with a final diameter of 7/8' - has keyway and d/t 3/8-24 - has 2:1 side aux. The repair procedure isn’t complex, but a few techniques need to be followed to nail this repair successfully. A broken shear-key is, as you now know, the most likely cause of engine kickback. If the timing is out a little, your mower may run but run rough. When the timing is out a lot, the mower won’t start. When the timing is out/off, you run the risk of severely damaging the engine. Timing maintains a mechanical set relationship between internal engine components and firing the spark plug at the optimum time. Common symptoms of broken shear key include:īefore I describe the repair, it may be helpful to know a little about engine timing, don’t worry, I’ll keep it short. The shear key commonly breaks because the blade has kit a solid object and come to a sudden stop. It can sometimes whip you as it does so, which is Oouch!!.Ī lawnmower engine commonly kicks back when the shear key breaks. Kickback is when you pull start your mower, and the pull cord is snapped from your hand. When you experience kickback, you won’t mistake it for anything else.
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