scotty 252 #1 Posted September 25, 2015 (edited) anyone know what size an onan 16 hp flywheel bolt is? Is it fine thread or coarse and what is the length? thanks Edited September 25, 2015 by scotty Share this post Link to post Share on other sites
boomers_influence 106 #2 Posted September 25, 2015 scottythe bolt is 7/16 NC X 4.125 longit is listed as a special bolt.there is also a HD large washer and a HD small washer involved.i have a NOS take off from a 1998 P engine.boomers_influence@yahoo.com651 437 2826 M-F 10-7 S-S 12-6 cent time.thank you.boomer ( the used onan engine parts guy, also NOS and new ) 1 Share this post Link to post Share on other sites
