Mercury MerCruiser MCM 454 Mag MPI Service Manual page 71

Table of Contents

DRAINING CLOSED COOLING (COOLANT) MODELS

NOTE: All factory installed closed cooling systems come filled with DexCool Extended Life

Coolant. This antifreeze requires draining and replacing every five years. The color of this

antifreeze is orange. For best results any "top-off" fluid used should be DexCool Extended

Life Coolant. If DexCool Extended Life Coolant. is unavailable any type of ethylene glycol

based antifreeze may be used, but it will require the draining and replacing of the coolant

every two years.

IMPORTANT: Drain seawater section of closed cooling system only.

If boat is to remain in water after draining, seawater inlet hose must be removed and

plugged to prevent a siphoning action that may occur allowing seawater to flow

from the drain holes or removed hoses.

IMPORTANT: Boat must be as level as possible to ensure complete draining of

cooling system.

Seawater section of cooling system MUST BE COMPLETELY drained for winter

storage or immediately after cold weather use if the possibility of freezing

temperatures exist. Failure to comply may result in trapped water causing freeze

and/or corrosion damage to engine. Damage caused by freezing IS NOT covered by

the MerCruiser Limited Warranty.

IMPORTANT: Closed cooling section must be kept filled year-round with recom-

mended coolant. If engine will be exposed to freezing temperatures, make sure

closed cooling section is filled with an ethylene glycol antifreeze and water solution

properly mixed to protect engine to lowest temperature to which it will be exposed.

Quicksilver Premixed Marine Engine Coolant is already mixed.

IMPORTANT: Do not use Propylene Glycol Antifreeze in the closed cooling section

of the engine.

Downloaded from

https://needmanual.com/

SERVICE MANUAL NUMBER 23

90-861326--1 MARCH 1999

Chapters

Table of Contents