Evinrude 4906B 4HP 1969, Owner'S Manual

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much. Outboard lower units do not have
provisions to accommodate such expansion.
If the lubricant appears milky brown,
indicating the presence of water, a check
should be made to determine how the water
entered. If large amounts of lubricant must
be added to bring the lubricant up to the full
mark, a thorough inspection should be made
to find the cause of the lubricant loss.
Draining Lower Unit
The fill/drain plug on Johnson/Evinrude
lower units may be located towards the
bottom of the unit on the port side, star-
board side, or on the leading edge of the
lower unit. On many models a Phillips
screw will be found very close to the fill/
drain plug. NEVER remove this Phillips
screw because the lower unit would then
have to be disassembled in order to return
the cradle for the shift dog back in place.
Remove the drain plug and then remove
the vent plug located just above the anti-
cavitation plate.
Filling Lower Unit
Position the drive unit approximately
vertical and without a list to either port or
starboard. Insert the lubricant tube into the
FILL/DRAIN hole at the bottom plug hole,
DRAIN ING
GEAR Oil
The gear oil in the lower unit should be checked on a
daily basis during the season
of
operation. The oil
should be drained and replenished with new oil every
100 hours
of
operation.
BOAT TESTING 2-15
and inject lubricant until the excess begins
to come out the VENT hole. Install the
VENT plug first then replace the FILL plug
with NEW gaskets. Check to be sure the
gaskets are properly positioned to prevent
water from entering the housing. Many
times some of the gear lubricant is lost
during installation of the plugs. Therefore,
if the vent plug is removed again, and more
lubricant
added very SLOWLY using a small-
spout oil can to allow air to pass out the
opening, there is no doubt but what the unit
will be filled to capacity.
For detailed lower unit service proce-
dures, see Chapter 8. For lower unit
lubr ication capacities, see the Appendix.
Repairs and Adjustments
For detailed procedures to disassemble,
clean, assemble, and adjust the carburetor,
see the appropriate section in Chapter 4 for
the carburetor type on the engine being
serviced.
2-15 BOAT TESTING
Hook and Rocker
Before testing the boat, check the boat
Filling the lower unit with new gear oil. Notice the
unit is filled through the lower plug, but the upper plug
MUST
be
removed
to
allow trapped air
to
escape.