Flushing Cooling System - Mercury 496 MAG Bravo Owner's Manual

MANUAL DRAIN SYSTEM
NOTE: If air actuated drain system fails, use the blue drain plugs to drain engine.
NOTE: It may be necessary to lift, bend or lower hoses to allow water to drain completely when hoses are
disconnected.
7
Remove blue drain plugs from front and rear of cool fuel cell and from the seawater pump.
8
Remove end caps, sealing washers and gaskets from heat exchangers.
9
Repeatedly clean out drain holes using a stiff piece of wire. Do this until entire system is drained.
10
Remove both hoses from seawater pump.
11
Crank engine over slightly with starter motor to purge any water trapped in seawater pickup pump. DO NOT
ALLOW ENGINE TO START.
CB844
Your boat could come equipped with one of three different types of water pickups: through the hull, through the
transom and through the sterndrive. The flushing procedures for these systems are separated into two
categories: sterndrive water pickups and alternative water pickups. Consult your authorized Mercury MerCruiser
dealer for further explanation.
Sterndrive Water Pickups
There are three types of water pickups available on Mercury MerCruiser sterndrives: low water, dual water and
side pickups. Dual water pickups require the flushing attachment (44357Q2) and the flush seal kit (881150Q1),
low water pickups require the flushing attachment (849996T1) and side pickups require the flushing attachment
(44357Q2).
Dual Water Pickup
NOTE: Flushing is needed only for salty, brackish, mineral laden or polluted water applications. Flushing is
recommended after each outing for best results.
1
If flushing cooling system with boat in water:
A
Raise drive unit to TRAILER position.
B
Install appropriate flushing attachment over water intake openings in the gear housing.
C
Lower drive unit to full DOWN/IN position

Flushing Cooling System

Low Water Pickup
.
77899
Side Pickup
INDEX
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