Evinrude 4906B 4HP 1969 Owner's Manual page 133

4-42 FUEL
7- Align the mark on the cover with the
mark on the body, and then secure the cover
in this position with the three
screws.
8- Clean the surface of the intake mani-
fold thoroughly. Check to be sure all old
gasket material has been removed.
NEW gasket over the studs and into place on
the manifold. Slide the carburetor
intake manifold studs and secure it in place
with the attaching
EVENLY and ALTERNATELY.
fuel hose to the carburetor.
vacuum and water hoses to the carburetor
paying careful ATTENTION to connect the
proper hose to the correct
to the identification
during disassembly.
not made during disassemby, follow the hose
to the other end to ensure proper connection
to the carburetor.
a- Connect the water
fitting of the water choke.
b- Connect the outlet water hose to the
fitting closest to the carburetor.
end of this line is connected
the exhaust chamber on the port side of the
engine.
c- Connect the vacuum line to the vacu-
um diaphragm fitting.
line is connected to the intake manifold.
If the hoses are not connected correctly,
attaching
Place a
onto the
nuts. Tighten the nuts
Connect the
Connect
fitting according
given to the hoses
If identification was
hose to the top
The other
to a fitting on
The other end of this
wa ter will be injected
when the engine is cranked,
ser ies of horrendous problems.
Install the starter motor and generator
the engine being serviced
these two units.
dures outlined in the next paragraphs to test
and make the carburetor
a load condition.
n
TYPE CARBURETOR ADJUSTMENTS
the GOOD WORD
Under all conditions,
fuel system MUST be synchronized
the fine adjustments
made. See Chapter 5. After the synchroni-
zation has been completed,
following work.
9- Mount the engine in a test tank or
body of water.
connect a flush attachment
to the lower unit.
adjustment
attachment.
idle speed with no load on the propeller, the
engine could RUN-AWAY resulting
ous damage or destruction
CAUTION: Water must circulate through
the lower unit to the engine any time the en-
gine is run to prevent
pump in the lower unit. Just five seconds
without water will damage the water pump.
Start the engine and allow it to warm to
operating
speed idle by turning the low-speed needle
valve CLOCKW1SE until the engine begins to
misfire or the rpm drops noticeably.
this point, rotate the needle valve COUNT-
ERCLOCKWISE until the engine is operating
at the highest rpm.
If the engine is equipped with an adjust-
able high-speed
engine into FOR WARD gear, and then ad-
vance the throttle
(WOT). NEVER attempt
justment with a flush attachment
den hose attached
the high-speed
needle valve CLOCKWISE until the number
of rpm begins to drop, then rotate the high-
speed needle valve COUNTER-CLOCKWISE
until the highest rpm is reached.
throttle to idle speed.
a second time as described
step. Again, advance
WOT position and check the high-speed ad-
into the cylinder
resulting
is equipped with
Now, perform
adjustments
the ignition
to the carburetor
proceed with the
If this is not possible,
and garden hose
ONLY the low-speed
may be made using the flush
If the engine is operated above
of the unit.
damage
temperature. Adjust
needle valve,
to the wide open position
to make this ad-
to the lower unit.
by rotating the high-speed
Adjust the idle speed -
earlier
the throttle
in a
if
the proce-
under
and
before
are
in seri-
to the water
the 10w-
From
.
shift the
and gar-
Adjust
Return the
in this
to the