Flushing The Cooling System; Liner Replacement; Jet Drive Removal - Mercury 45 Jet 50-55 Service Manual

Flushing The Cooling System

Use Quicksilver accessory hose coupling Part Number
24789A1.
1. Remove plug and gasket (a) and thread-in hose
coupling (b).
2. Attach a water hose to the hose coupling. Turn on
the water gently, start the engine, and run it at idle
speed only.
3. Check for a steady stream of water flowing out of
the water pump indicator hole. Continue flushing
the outboard for 3 to 5 minutes; adjust water pres-
sure if needed.
4. Stop the engine, turn off the water, and remove the
hose coupling. Reinstall the plug and gasket.
a
a - Plug and Gasket
b - Hose Coupling

Liner Replacement

1. Mark the liner mounting bolts for reassembly into
the same holes. Remove the bolts.
6C-12 - LOWER UNIT
b
2. Remove the liner. If the liner is tight, tap on the inner
edge of the liner with a long drift punch through the
intake grate.
NOTE: Apply grease to the liner mounting bolt threads
before assembly.
3. Position the liner into the water intake housing.
Line up one of the liner bolts and lightly thread it in.
It may be necessary to tap or press the liner into the
water intake housing to locate the liner for installa-
tion of the remaining bolts. Torque bolts to 100 lbs.
in. (11.2 N·m)
4. Grind off the ends of any bolts that may extend be-
yond the inner liner surface.

Jet Drive Removal

1. Shift outboard to NEUTRAL (N) position and dis-
connect the shift linkage.
2. Remove spark plug leads to prevent engine from
starting.
3. Remove the water intake housing that is fastened
with six screws.
90-817643R1 DECEMBER 1996