Cleaning And Inspection; Reassembly; Thermostat; Removal - Mercury MerCruiser MCM 454 Mag MPI Service Manual

SEAWATER COOLED MODELS

Cleaning and Inspection

1. Clean any debris from strainer housing.
2. Flush both strainer and housing with clean water.
3. Check gasket; replace when necessary (if it leaks).

Reassembly

1. Reinstall strainer, drain plug and washer.
2. Reattach cover with screws and washers.
3. Open seacock, or unplug and reconnect seawater inlet hose.
4. Tighten hose clamps securely.
5. After starting engine, check for leaks and/or air in system, which would indicate an exter-
nal leak.

Thermostat

Removal

1. Drain water from cylinder block and exhaust manifolds.
2. Remove thermostat housing and related components.
3. Remove thermostat from thermostat housing or cover.
Index
Page 6A-24
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a - Housing
b - O-Ring
c - Thermostat (Stainless Steel)
d - Spacer
e - Gasket
SERVICE MANUAL NUMBER 23
a
b
c
d
e
90-861326--1 MARCH 1999
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