Mercury 305 CID - Thermostat; Removal

SEAWATER COOLING MODELS - 6A-990-823225--1 1096
!
CAUTION
Do not over-tighten cover screws or cover will
warp and leak.
2. With engine off, close seacock, if so equipped, or
remove and plug seawater inlet hose, if no sea-
cock exists. Remove two screws and washers,
and cover. Remove strainer, and drain plug and
washer. Clean any debris from strainer housing;
flush both strainer and housing with clean water.
Check gasket; replace when necessary (if it
leaks). Reinstall strainer, drain plug and washer.
Reattach cover with screws and washers. Open
seacock, or unplug and reconnect seawater inlet
hose. Tighten hose clamps securely. After start-
ing engine, check for leaks and/or air in system,
which would indicate an external leak.
72673
b
c
d
e
f
g
h
a
Quicksilver Seawater Strainer Shown
a - Screws and Washers
b - Cover
c - Glass
d - O-Ring
e - Strainer
f - Housing
g - Drain Plug and Sealing Washer
h - Gasket
Thermostat
Removal
1. Drain water from cylinder block and exhaust
manifolds.
2. Remove thermostat cover attaching bolts and
lockwashers, then remove cover and gasket.
3. Remove thermostat from thermostat housing or
cover.
NOTE: If equipped with a lifting eye (not shown in
following), note placement of lifting eye so that it may
be positioned exactly the same upon installation, or
it may interfere with the fit of the flame arrestor
cover.
72589
b
c
d
a
e
f
6 Hose Thermostat Housing
a - Cover
b - Gasket
c - Spacer
d - Thermostat
e - O-Ring
f - Housing
71758
b
c
d
a
e
4 Hose Thermostat Housing
a - Housing
b - O-Ring
c - Thermostat (Stainless Steel)
d - Spacer
e - Gasket