MerCruiser 305 CID (5.0L) Service Manual page 761

CLOSED COOLED MODELS
Installation
Avoid seawater pickup pump impeller damage. DO NOT operate engine without
cooling water being supplied to seawater pickup pump.
1. Remove thermostat housing and gaskets. Discard gaskets.
2. Clean gasket surfaces on thermostat cover, thermostat housing and intake manifold.
3. Position gasket on intake manifold. Place thermostat housing on gasket.
IMPORTANT: If gasket has continuity rivets, do not coat with Quicksilver Perfect Seal,
or audio warning temperature switch may not work properly.
4. Install thermostat, as previously shown, into thermostat housing.
5. Position gasket on thermostat and reinstall thermostat cover. Torque bolts to 30 lb-ft (41
Nm).
6. Connect hoses to thermostat cover. Tighten hose clamps securely.
7. With boat in the water and/or cooling water properly supplied to seawater pickup pump,
start engine and inspect for leaks.
Index
Page 6B-12
a - Thermostat Housing
b - Thermostat
c - Gasket
d - Thermostat Housing Cover
CAUTION
a
b
c
d
SERVICE MANUAL NUMBER 24
75746
90-861327--1 OCTOBER 1999