Evinrude 4906B 4HP 1969, Owner'S Manual

Page: 211 / 422

6-22 ELECTRICAL
pulley indexed with the Woodruff key. In-
stall the dr ive bel t around the pulley on the
flywheel and the generator pulley.
3- Install the pulley cap, lockwasher,
and nut, to secure the generator pulley in
place. Hold the generator shaft from turn-
ing with an open-wrench on the flats of the
shaft underneath the pulley. Adjust tension
on the generator pulley by pulling the gener-
ator away from the engine, and then tight-
ening the thru-bolt nuts securing the gener-
ator in the bracket. The pulley is properly
adjusted when it may be depressed approxi-
mately 1/4" at a point mid-way between the
two pulleys.
6-10 CHOKE CIRCUIT SERVICE
This short section provides instructions
to test the choke circuit. If the system fails
the test, the attaching hardware can be
removed and the choke assembly replaced.
TEST
LEAD TO TERMINAL
Hookup points to test an electric choke.
Choke Circuit Testing
The choke circuit may be quickly tested
to determine if it is functioning properly as
follows:
a- Obtain an ohmmeter.
b- Connect the black meter lead to an
unpainted portion of the engine block for
a good ground.
c- Connect the red meter lead to the
choke terminal.
d- Test the circuit using the Rxl scale
of the ohmmeter. A satisfactory reading
is approximately 3 ohms. .
e- After the test is completed, check to
be sure the choke plunger is pulled into
the choke solenoid.
6-11 STARTER MOTOR CIRCUIT SERVICE
CIRCUIT DESCRIPTION
As the name implies, the sole purpose of
the starter motor circuit is to control oper-
ation of the starter motor to crank the
engine until the engine is operating. The
circuit includes a solenoid or magnetic
switch to connect or disconnect the starter
from the battery. The operator controls the
switch with a pushbutton or key switch.
A cutout switch is installed in the sys-
tem to prevent starting the engine if the
throttle is advanced too far, beyond idle
speed. When the throttle is advanced, the
starter solenoid is not grounded and the
starter motor will not rotate. On electric
shift models, a cut-out switch is installed in
the circuit to permit operation of the start-
er motor ONLY if the shift control lever is
in NEUTRAL. This switch is a safety device
to prevent accidental engine start when the
engine is in gear.
STARTER MOTOR DESCRIPTION
Delco-Remy, Autolite, and Prestolite
starter motors are used on the Johnson/
Evinrude engines covered in this manual.
Any of the three may be installed on a
35
hp
or 40 hp engine. The early model starters
(especially the Delco-Rerney) were shorter
and just a bit less powerful than the later
models. If a replacement unit must be
purchased, anyone of the three may be
obtained and installed. The
recommendation is to spend a few dollars
more for the longer, more powerful unit.
One more word: If a long starter motor is
replacing the short model, an additional
bracket MUST be bought and installed on the
lower end of the starter.
Marine starter motors are very similar
in construction and operation to the units
used in the automotive industry. All marine
starter motors use the inertia-type drive
assembly. This type assembly is mounted on
an armature shaft with external spiral
splines which mate with the internal splines
of the drive assembly.
The starter motor is a ser ies wound
electr ic motor which draws a heavy current
from the battery. It is designed to be used
only for short periods of time to crank the
engine for starting. To prevent overheating
the motor, cranking should not be continued