Mercury MerCruiser D2.8L D-Tronic Service Manual page 61

MAINTENANCE
SERVICE MANUAL NUMBER 22
3. –Drain coolant from the engine block by opening the drain valve.
a
76391
Typical
a - Engine Block Drain Valve
4. After coolant has drained completely, securely close drain valves.
5. Empty the coolant recovery bottle.
6. If required, clean the closed cooled system. Refer to SECTION 6A.
7. Fill system with required coolant, as outlined in Filling.
90-860074--1 FEBRUARY 2002 Page 1B-31