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.
3. If the coolant is low in the coolant expansion tank, add the specified coolant as necessary to bring the level between the
minimum mark and the maximum mark.
a - Pressure cap
b - Maximum mark
c - Minimum mark
Description Capacity Part Number
Extended Life Antifreeze/Coolant 9.0 Liter (9.5 US qt) 92‑877770K1
IMPORTANT: When installing the pressure cap, be sure to tighten it securely until the cap clicks to prevent coolant loss.
4. Install the pressure cap. Tighten it securely until the cap clicks.
Changing
Change (replace) the engine coolant at the prescribed interval. Refer to Replacing the Engine Coolant in the
Closed‑Cooling System.
Section 4 - Maintenance
90-8M0133568 eng JUNE 2017 Page 41
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