Cold Weather Or Extended Storage; Precautions - Mercury MerCruiser MCM 454 Mag MPI Service Manual

MAINTENANCE
10. Manually close the throttle to bring engine rpm back to idle.
IMPORTANT: Set the tool to NORMAL MODE before attempting to resume normal op-
erations. If the setting of the tool remains in SERVICE MODE, the ignition system will
operate only in the "Service Mode." This means that the additional timing advance
features would not function.
11. Set the Scan Tool to NORMAL MODE. Disconnect the tool.
12. Stop the engine. Turn ignition key to OFF position.
13. Remove timing light.

Cold Weather or Extended Storage

Precautions

BE CAREFUL while working on fuel system; gasoline is extremely flammable and
highly explosive under certain conditions. Be sure that ignition key is OFF and do
not smoke or allow sources of spark and/or open flames in the area.
To prevent a potential fire hazard, be sure that engine compartment is well
ventilated and that there are no gasoline vapors present during starting or fogging
of engine.
DO NOT operate engine without cooling water being supplied to seawater pickup
pump or water pump impeller will be damaged and subsequent overheating
damage to engine may result.
Seawater (Raw-water) section of cooling system MUST BE COMPLETELY drained
for winter storage, or immediately after cold weather use, if the possibility of freez-
ing temperatures exists. Failure to comply may result in trapped water causing
freeze and/or corrosion damage to engine.
If boat is in the water, seacock (water inlet valve), if so equipped, must be left closed
until engine is to be re-started, to prevent water from flowing back into cooling
system and/or boat. If boat is not fitted with a seacock, water inlet hose must be left
disconnected and plugged to prevent water from flowing back into cooling system
and/or boat. As a precautionary measure, attach a tag to the ignition switch or
steering wheel of the boat with the warning: Open seacock or reconnect water inlet
hose before starting engine.
IMPORTANT: Observe the following information to ensure complete draining of cool-
ing system.
Engine must be as level as possible.
A wire should be repeatedly inserted into all drain holes to ensure there are no
obstructions in passages. Remove petcock, if necessary, to insert wire complete-
ly into drain hole.
Index Index
Page 1B-44
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WARNING
WARNING
CAUTION
CAUTION
CAUTION
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999