Ratchet nut has a right hand thread. Although there is a Mercury
Service Tool for removing and installing the Ratchet Nut a padded
pipe wrench will work. There is also a Mercury Service Tool for holding flywheel steady many use rope in cylinder, Torque spec for flywheen
nut is 40 FOOT pounds, Too little and keyway gets battered by loose flywheel…too tight may split hub of flywheel thru keyway slot
To have spark. the points. coils, condensers, connections, wires and
spark plug ALL have to be at work. If you find a film of oil on magneto
plate suspect the upper crankshaft seal. At the other end of things water pump impeller and seal are usually deteriorated. Gear case should
be inspected and lubed. There are some small parts involved that may
insist on getting lost of left out, Take photos as you go so you can
follow a favorite repair manual instruction…Reassemble in Reverse Order…Upper seal is 7415 water pump seal is 4923
Upper seal access requires removal of magnet rotor…tricky job without
the Mercury Service Tools for removing and replacing. Rotor can be
broken by prying (this applies for Bendix Scintilla magneto system yours appeare to be Eisemann Magneto system _
A lot of do this and don’t do that…all of which I learned the hard way…the language in your work shop will be more civil if you can avoid
the learning experiences,
Good Luck
Louis
