Evinrude 4906B 4HP 1969 Owner's Manual page 212

for more than 3D-seconds without allowing
the motor to cool for at least three minutes.
Actually, this time can be spent in making
preliminary checks to determine
engine fails to start.
Most starter motors operate in much the
same manner and the service work involved
in restor ing a defective
almost identical. Therefore,
tion in this chapter is grouped together
the major components of the starter
separate headings.
occur, between the various manufacturers,
are clearly indicated.
Theory of Operation
Power is transmitted
motor to the engine
Bendix dr ive, This drive has a pinion gear
mounted on screw threads.
is operated, the pinion gear moves up into
mesh with the teeth on the flywheel
gear.
When the engine starts, the pinion gear
is driven faster than the shaft,
result, it screws out of mesh with the fly-
wheel. A rubber cushion is built into the
Bendix dr ive to absorb the shock when the
pinion meshes with the flywheel ring gear.
The parts of the drive MUST be properly
assembled for efficient
drive is removed for cleaning, TAKE CARE
to assemble the parts as shown in the ac-
companying illustration.
assembly is reversed, it will strike the splin-
es and the rubber cushion will not absorb the
shock.
Functional diagram
why the
unit to service is
the informa-
under
Differences, where they
from the starter
flywheel through
When the motor
ring
and as a
operation. If the
If the screw shaft
to
show current flow when the key switch
The sound of the motor during cranking
is a good indication of whether the starter
motor is operating properly or not. Natural-
ly, temperature
speed at which the starter
crank the engine.
cold engine will be much slower than when
cranking a warm engine.
operator will learn to recognize the favor-
able sounds of the cranking
for
var ious conditions.
Faulty Symptoms
If the starter spins, but fails to crank the
engine, the cause is usually a corroded or
gummy Bendix drive.
removed, cleaned, and given an inspection.
a If the starter
slowly, the following are possible causes and
the corrective
a- Battery
battery to full capacity.
b- High resistance
battery,
tighten all connections.
c- Undersize
cables with sufficient size.
d- Battery
the battery
starter solenoid.
Maintenance
The starter
odic maintenance
just a drop of light-weight
shaft to ease movement of the Bendix drive.
If the motor fails to perform properly, the
SAFETY SWITCH
is
STARTER MOTOR
conditions will affect
motor is able to
The speed of cranking a
An experienced
engine under
The drive should be
motor cranks the engine to
actions that may be taken:
charge is low.
connections
solenoid, or motor.
battery cables.
cables too long.
to shorten the run to the
motor does not require peri-
or lubrication
oil on the starter
STARTER
GROUND
to
turned the START position.
6-23
the
Charge the
at the
Clean and
Replace
Relocate
EXCEPT