Maintaining Closed Cooling Coolant Level; Flushing Cooling System; Mcm (Stern Drive) - Mercury MCM Series Important Information Manual

Maintaining Closed Cooling
Coolant Level
! WARNING
Allow engine to cool down before removing pres-
sure cap. Sudden loss of pressure could cause
hot coolant to boil and discharge violently. After
engine has cooled, turn cap 1/4 turn to allow any
pressure to escape slowly, then push down and
turn cap all the way off.
1. Coolant level in heat exchanger should be full (to
bottom of filler neck).
IMPORTANT: When reinstalling pressure cap, be
sure to tighten it until it contacts stop on filler
neck.
2. Coolant level should be between the ADD and
FULL marks on coolant recovery reservoir with
the engine at normal operating temperature.
a
a - Coolant Recovery Reservoir
Index
90-823224--2 796

Flushing Cooling System

If engine is operated in salty, polluted, or mineral-lad-
en water, flush cooling system (preferably after each
use) to reduce corrosion and prevent the accumula-
tion of deposits in the system. Thoroughly flush cool-
ing system prior to storage.

MCM (Stern Drive)

BOAT OUT OF WATER
1. Install flushing attachment over water pickup
holes in gear housing as shown.
2. Attach a garden hose between the flushing at-
tachment and a water tap.
a - Flushing Attachment
b - Hose
72520 When flushing, be certain the area around pro-
peller is clear, and no one is standing nearby. To
avoid possible injury, remove propeller.
Do not run engine above 1500 RPM when flush-
ing. Suction created by seawater pickup pump
may collapse flushing hose, causing engine to
overheat.
a
b
! WARNING
! CAUTION
MAINTENANCE - 1B-13
72693