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Old 04-12-2013, 08:31 AM
besman besman is offline
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Join Date: Nov 2011
Posts: 10
21hp Briggs engine

Hi - i am working on my cousin's lanwnmower since they don't have alot of funds to take it to the shop. It's a JD 0-turn originally with a 17.5hp Briggs vertical shaft engine but let loose last year so was replaced with a 21hp single Briggs. I don't have the engine model number but the date of manufacture was oct 2012 i believe. i found that the flywheel bolt was loose and sheared the key. The keyways on both the flywheel and crank are fine just needs a new key. Now, the question, what's the correct torque for this flywheell bolt?

thanks,

M
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Old 04-12-2013, 10:58 AM
kymowboy kymowboy is offline
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Join Date: Jun 2012
Location: Kentucky
Posts: 44
21 hp single vertical is either a model 31 or model 33, both show 100 ft-lb in the Briggs "Single Cyinder OHV Air Cooled" manual.
Make sure you get the "right" key, don't try to make a piece of regular key stock work.
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Old 04-12-2013, 11:11 AM
besman besman is offline
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Join Date: Nov 2011
Posts: 10
kymowboy - ok. 100 ft-lbs. Just what i needed. yeah i told him to go to the store and pick up a key, he was wanting to make since he was a machinist at one time. He is now going to get one this morning.
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