Checking
IMPORTANT: Check the engine coolant before starting the engine.
1. Stop the engine and allow the engine to cool.
2. Remove the pressure cap from the coolant expansion tank.
3. The coolant level must be above the minimum mark and below the maximum mark on the coolant expansion tank.
a - Pressure cap
b - Maximum mark
c - Minimum mark
IMPORTANT: The coolant level is monitored by a sensor. If the coolant level is low, a fault will be recorded, indicated on a
SmartCraft gauge, and a warning tone will be activated.
4. If the coolant level is low:
a. Inspect the coolant recovery system for leaks.
b. Inspect the O‑ring in the pressure cap for damage and replace if necessary.
a - Pressure cap
b - Over pressure valve
c - O‑ring
c. The pressure cap maintains pressure on the cooling system and may not be holding pressure properly. To have the
cap tested, contact your Mercury Diesel authorized repair facility.
d.
Refer to Filling and add the specified coolant as necessary.
IMPORTANT: When installing the pressure cap, be sure to tighten it securely until it clicks to prevent coolant loss.
5. If the coolant level is correct, install the pressure cap and tighten securely until it clicks.
Filling
1. Allow the engine to cool.
2. Remove the pressure cap from the coolant expansion tank.
Section 4 - Maintenance
90-8M0145546 eng MAY 2018 Page 53
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