Boat In The Water - MerCruiser 4.3L TKS Sterndrive Owner's Manual

Section 6 - Storage
d. Fuel‑cooler‑to‑thermostat‑housing hose
a
e. Check valve
a
3. On models with a seawater pickup pump, remove the two blue drain plugs. If the seawater pickup pump does not have blue
drain plugs, or you are unable to access them, loosen the clamps and remove both hoses.
a - Hose clamps
b - Blue drain plugs
4. Crank the engine over slightly with the starter motor to purge any water trapped in the seawater pickup pump. Do not allow
the engine to start.
5. After the cooling system has been drained completely, install the drain plugs, reconnect the hoses, and tighten all hose clamps
securely.

Boat in the Water

1. Close the seacock (if equipped) or remove and plug the water inlet hose.
2. Remove the blue drain plugs from the following locations. If necessary, clean out the drain holes using a stiff piece of wire.
Do so until the entire system is drained.
a. Port and starboard side of cylinder block
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a
b
a - Drain plug
a - Drain plug (if equipped)
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90-8M0053265 NOVEMBER 2010