MerCruiser 305 CID (5.0L) Service Manual page 77

SERVICE MANUAL NUMBER 24
4. Remove seawater pump inlet hose.
5. Remove end caps, sealing washers and gaskets from the heat exchanger. Allow tubes
to drain.
IMPORTANT: Use compressed air to blow any remaining water from the tubes in the
heat exchanger.
6. Repeatedly clean out drain holes using a stiff piece of wire. Do this until entire system
is drained.
7. After seawater section of cooling system has been drained completely:
a. Install all drain plugs and tighten securely.
b. Reconnect hoses and tighten all hose clamps securely.
c. Apply Quicksilver Perfect Seal to both sides of new end plate gaskets.
d. Assemble new gaskets, new sealing washers and end plates onto heat exchanger.
e. If NOT equipped with seacock: Seawater inlet hose must remain disconnected
Index
90-861327--1 OCTOBER 1999
a - Seawater Inlet Hose
b - Hose To Cooler
c
a - Heat Exchanger
b - Sealing Washer
c - End Cap
d - Gasket
Torque end plate screws to 36-72 lb-in. (4-8 Nm).
and plugged until engine is to be restarted.
b
a
a
b
d
MAINTENANCE
75533
71515
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