Closed Cooling System; Checking Coolant Level - Mercury MerCruiser MCM 4.3L ALPHA Service Manual

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SERVICE MANUAL NUMBER 25

Closed Cooling System

Checking Coolant Level

Allow engine to cool down before removing pressure 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 on
filler neck.
2. Coolant level should be between the ADD and FULL marks on coolant recovery reser-
voir with the engine at normal operating temperature.
Index
90-861328--1 NOVEMBER 1999
a -
Coolant Recovery Reservoir
CAUTION
a
MAINTENANCE
72520
Page 1B-17

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