INSTALLATION MANUAL
Page 64 of 77 90-864198020
4. Remove the two blue drain plugs from the seawater pickup pump (front, starboard side).
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5. Verify that water is draining from each opening.
6. Allow the system to drain for a minimum of 5 minutes. Mercury MerCruiser recommends
leaving the drain system open while transporting the boat or while performing other
maintenance.
7. Crank engine over slightly with starter motor to purge any water trapped in seawater
pickup pump. Do NOT allow engine to start.
8. Prior to launching boat or starting the engine, close the drain system by installing the
4 blue drain plugs.
IMPORTANT: Mercury MerCruiser recommends that propylene glycol (a nontoxic
and environmentally safe) antifreeze be used in the 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 recommendations.
9. Open the seacock prior to operating the engine.
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