Section 5 - Maintenance
90-8M0099741
eng
JUNE 2015
Page 57
1. Remove the cap from the heat exchanger and observe the fluid level.
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Heat exchanger cap
2. The coolant level in the heat exchanger should be at the bottom of the filler neck. If the coolant level is low, contact your
authorized Mercury MerCruiser dealer.
3. Install the cap onto the heat exchanger.
IMPORTANT: When installing the cap, be sure to tighten it until it seats on the filler neck.
4. With the engine at normal operating temperature, check the coolant level in the coolant recovery bottle.
5. The coolant level should be between the ADD and FULL marks.
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6. Add the specified fluid as necessary.
Tube Ref No.
Description
Where Used
Part No.
122
Extended Life Antifreeze/Coolant
Closed Cooling System
92-877770K1
Filling
NOTICE
Using propylene glycol antifreeze in the closed cooling system can damage the cooling system or the engine. Fill the closed
cooling system with an ethylene glycol antifreeze solution suitable to the lowest temperature to which the engine will be
exposed.
NOTICE
Without sufficient cooling water, the engine, the water pump, and other components will overheat and suffer damage. Provide
a sufficient supply of water to the water inlets during operation.
NOTICE
Air trapped in the closed cooling system can cause the engine to overheat, resulting in engine damage. Minimize the
possibility of trapping air when initially filling the closed cooling system by positioning the boat so that the front of the engine
is higher than the rear of the engine.
