Mercury MCM Series Important Information Manual page 30

8. Crank engine over slightly with starter motor to
purge any water trapped in seawater pickup
pump. DO NOT ALLOW ENGINE TO START.
9. After cooling system has been drained complete-
ly, coat threads of drain plugs with Quicksilver
Perfect Seal. Install all drain plugs and tighten se-
curely. Reconnect all hoses and tighten all hose
clamps securely.
IMPORTANT: MerCruiser recommends that pro-
pylene glycol antifreeze (nontoxic and biode-
gradable, which makes it friendly to lakes and riv-
ers) be used in sea-water section of the cooling
system for cold weather or extended storage.
Make sure that the propylene glycol antifreeze
contains a rust inhibitor and is recommended for
use in marine engines. Be certain to follow the
propylene glycol manufacturer's recommenda-
tions.
Index
1B-28 - MAINTENANCE
10. For additional assurance against freezing and
rust, remove the thermostat cover and thermo-
stat. Fill the engine seawater cooling system with
a mixture of antifreeze and tap water mixed to
manufacturer's recommendation to protect en-
gine to the lowest temperature to which it will be
exposed during cold weather or extended stor-
age. Using a new gasket, reinstall thermostat and
cover. Tighten cover bolts to 30 lb. ft. (41 N·m).
NOTE: Hoses shown removed only to indicate flow.
Do not remove hoses.
a
b
c
f
f
c
a - Cover
b - Gasket
c - Spacer
d - Thermostat
e - O-Ring
f - Housing
g - Fill Here
d
e
g
72589
e
d
g
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