Evinrude 4906B 4HP 1969, Owner'S Manual

Page: 178 / 422

20- Hold the armature plate and separ-
ate the coils from the plate. As the coil is
separated from the plate, observe the high-
tension lead to the spark plug inside the
coil. Work the small boot, if used, and the
high-tension lead from the coil.
CLEANING AND INSPECTING
Inspect the flywheel for cracks or other
damage, especially around the inside of the
center hub. Check to be sure metal parts
have not become attached to the magnets.
Ver if y each magnet has good magnetism by
using a screwdr iver or other tool.
Throughly clean the inside taper of the
flywheel and the taper on the crankshaft to
prevent the flywheel from "walking" on the
crankshaft while the engine is running.
Check the top seal around the crankshaft
to be sure no oil has been leaking onto the
armature plate. If there is ANY evidence
the seal has been leaking, it
MUST
be re-
placed, as outlined earlier in this section.
A coil burned where the high-tension lead
enters
the
coil on the bottom
side.
Arcing
caused
the damcge.
CLEANING AND INSPECTING 5-19
"'..,' .. BLOW,
hi
~~Oll
A coil destroyed when the side blew out. This
damage was caused when 12-volts was connected to the
magneto circuit at the key switch.
Test the armature plate to verify it is
not loose. Attempt to lift each side of the
plate. There should be little or no evidence
of movement.
Clean the surface of the armature plate
where the points and condenser attach. In-
stall a new condenser into the recess and
secure it with the hold-down screw.
A broken crankshaft
and
cracked flywheel damaged
when the engine was operated
at a
high rpm with
a
flush attachment and garden hose connected to the
lower unit.
Cracks in the flywheel hub caused by metal fatigue
due to
flywheel construction and the inspection hole.
This hole is no longer incorporated in late-model fly-
wheels.