Mercury 35/40HP 2 Cylinder Outboards Service Manual PN 90-42794--1, Page 21Get this manual
Ignition Components Removal and Installation
FL YWHEEL REMOVAL
Install flywheel key (a) into slot in crankshaft
Hold flywheel using Flywheel Holder (91-52344) as shown, and remove locknut and flatwasher which secure flywheel to crankshaft
Reinstall flywheel on crankshaftSecure flywheel with flat washer and locknutWhile holding flywheel with Flywheel Holder (91-52344)torque flywheel nut 70 lbft(95 Nm)