Mercury 4.2 Diesel User Manual

Section 4 - Maintenance
Page 68 90-8M0113987 eng DECEMBER 2015
4. Remove the heat exchanger drain plug.
4.2 shown, 2.8 similar
a - Intake and exhaust manifold drain plug
b - Fluid cooler drain plug
5. Open the engine block drain plug.
4.2 shown, 2.8 similar
a - Engine block drain plug
6. After the coolant has drained completely, install the intake and exhaust manifold drain plug, the heat exchanger drain plug,
and the engine block drain plug. Tighten all drain plugs securely.
7. If required, clean the closed‑cooling system. See your local Mercury Diesel authorized repair facility.
8.
Fill the system with the specified coolant. Refer to Filling the Closed Cooling System.
Filling the Closed‑Cooling System
1. Remove the pressure cap.
a -
Pressure cap
b - Coolant expansion tank
a
b
23631
24552
a
a
b
23302

Mercury 4.2 Diesel Specifications

General

Brand	Mercury
Model	4.2 Diesel
Category	Engine
Language	English