Evinrude 4906B 4HP 1969 Owner's Manual page 35

2-10 TUNING
of
Two the many types
OMC outboard engines.
rebuilt, as explained in the text.
to enter the crankcase
spark plug at idle-speed.
operation, gas quantity
is not foul and will therefor
satisfactory manner.
If the fuel pump falls to per orm proper-
ly, an insufficient
livered to the carburetor.
will cause the engine to run
or cause piston scoring.
When a fuel pressure gauge is added to
the system, it should be installed at the end
of the fuel Iine leading to the upper carbu-
retor. To ensure maximum
the fuel pressure must be 2 psi or more at
full throttle.
This fuel pump is the only OMC pump that can
rebuilt. Replacement parts are available from the local
OMC dealer.
of
fuel purr installed
IS
pu IpS
These fuel cannot
and w t foul the
Durin high-speed
is Emit d, the plug
fire in a
fuel supply will be de-
This lack of fuel
If .an, lose rpm
performance,
Tune-up Task
Most fuel pumps are equipped with a fuel
filter. The filter may be cleaned by first
removing the cap, then the filter element,
cleaning the parts
compressed
in their original position.
A fuel pump pressure
made any time the engine falls to perform
satisfactorily
NEVER use liquid Neoprene on fuel line
fittings. Always use Permatex
fuel line connections.
at almost all marine and hardware stores.
Only one Johnson/Evinrude
on
may be rebuilt,
be
tion. All others pumps must be replace as a
unit. For fuel pump service, see Chapter 4.
2-10 STARTER AND SOLENOID
Starter Motor Test
Check to be sure the battery
ampere rating and is fully charged.
you believe, many starter
lessly disassembled,
actually the culprit.
Lubricate
shaft with No. 10 oil.
Connect one lead of a voltmeter
posi ive terminal
t
Commercial
to keep the gasoline
be
favorable conditions,
fuelfrom "souring" for
and drying them
air, and finally installing
test
at high speed.
when making
Permatex
see accompanying
motors are need-
when the
the pinion gear
of the starter
additives, such as Sui-btl,
in the fuel tank fresh.
such additives will
up to
twelve months.
with
them
should be
is available
fuel pump
illustra-
has a 70-
Would
battery is
and screw
to the
motor.
may be used
Under
prevent the