About Marc Mielhausen Expertise I work on equipment in my spare time for myself, family and friends. I have experience in troubleshooting and fixing lawnmowers, string trimmers, chain saws, tillers, snowmobiles, inboard and outboard motors. As I am not currently employed in this industry, I can be of assistance more in non-brand-specific diagnostic questions. Try me.
Experience 15 years experience (6 professionally & 9 personally) Also have related experience in automotive manufacturing, machining, precision measurement, gauge and fixture design. As long as I can remember I have been troubleshooting and repairing mechanical devices of all types.
Education/Credentials Ontario Certificate of Qualification for Marine and Small Powered Equipment Technician (1993)
Mechanical Engineering Technician - Materials & Quality (1997)
Question I have a Sears model number 917.373980,22", 5.5 hp self propelled rotary lawn mower. When last running, the engine was very noisy, sounding like a bucket of bolts. I stopped for a break, and it would not restart. There was kick-back on the pull starter rope, and a puff of black smoke from the filter. Thanks
Answer Sounds like the flywheel key is sheared. The noise is likely the blade hub is loose or the key is sheared. This would also shear the flywheel key. If you have to replace the flywheel key, make sure you inspect the blade hub or it will just shear the flywheel key again. Hope this helps.
