Service manual

MAINTENANCE SERVICE MANUAL NUMBER 26

Page 1B-24 90-861329--1 MARCH 1999

5. Insert a small wire (repeatedly) to make sure that vent holes and water drain holes and

passages (as shown) are unobstructed and open.

71216

70134

a-Speedometer Pitot Tube

b-Gear Housing Cavity Drain Hole

c-Trim Tab Cavity Vent Hole

d-Trim Tab Cavity Drain Passage

e-Gear Housing Water Drain Hole (One Each - Port and Starboard)

f-Gear Housing Cavity Vent Hole

6. Crank engine over SLIGHTLY, with starter motor, to purge any water trapped in seawa-

ter pickup pump. DO NOT ALLOW ENGINE TO START.

CAUTION

If boat is in the water or is to remain in the water, seacock (if equipped) must remain

closed until engine is to be restarted, to prevent water from flowing back into

cooling system. If boat is not fitted with a seacock, seawater inlet hose must remain

disconnected and plugged, to prevent water from flowing into cooling system

and/or boat. As a precautionary measure, attach a tag to the ignition switch or

steering wheel with the warning that the seacock must be opened or the seawater

inlet hose reconnected prior to starting the engine.

7. After cooling system has been drained completely, coat threads of drain plugs with

Quicksilver Perfect Seal and reinstall. Tighten drain plugs securely. Reconnect hoses

and tighten all hose clamps securely. If NOT equipped with seacock: seawater inlet

hose must remain disconnected and plugged until engine is to be restarted.

IMPORTANT: MerCruiser recommends that propylene glycol antifreeze (nontoxic

and biodegradable, which makes it friendly to lakes and rivers) be used in seawater

section of the cooling system for cold weather or extended storage. Make sure that

the propylene glycol antifreeze contains a rust inhibitor and is recommended for use

in marine engines. Be certain to follow the propylene glycol manufacturer’s recom-

mendations.

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