Flushing Power Unit; Cleaning The Outboard Motor - Yamaha F150D Owner's Manual

Maintenance
Procedure
1. Disconnect and remove the battery from
the boat. Always disconnect the black
negative cable first to prevent the risk of
shorting.
2. Clean the battery casing and terminals.
Fill each cell to the upper level with dis-
tilled water.
3. Store the battery on a level surface in a
cool, dry, well-ventilated place out of di-
rect sunlight.
4. Once a month, check the specific gravity
of the electrolyte and recharge as re-
quired to prolong battery life.
EMU28440

Flushing power unit

Perform this procedure right after operation
for the most thorough flushing.
1. After shutting off the engine, unscrew the
garden hose connector from the fitting on
the bottom cowling.
1. Fitting
2. Garden hose connector
44
3. Garden hose
2. Screw the garden hose connector onto a
garden hose which is connected to a
fresh water supply.
3. With the engine off, turn on the water tap
and let the water flush through the cool-
ing passages for about 15 minutes. Turn
off the water and disconnect the garden
hose.
4. When flushing is complete, reinstall the
garden hose connector on the fitting on
the bottom cowling. Tighten the connec-
tor securely.
ECM00540
CAUTION:
Do not leave the garden hose connector
loose on the bottom cowling fitting or let
the hose hang free during normal opera-
tion. Water will leak out of the connector
instead of cooling the engine, which can
cause serious overheating. Be sure the
connector is tightened securely on the fit-
ting after flushing the engine.
NOTE:
When flushing the engine with the boat in
G
the water, tilting up the outboard motor until
it is completely out of the water will achieve
better results.
For cooling system flushing instructions,
G
see page 41.
EMU28450

Cleaning the outboard motor

After use, wash the exterior of the outboard
motor with fresh water. Flush the cooling sys-
tem with fresh water.