Chapter
Eight
Cooling
System
8
This chapter covers service procedures for the thermo-
stat, engine water pump, seawater pumps, drive belts and
connecting hoses in both standard and closed cooling sys-
tems.
Cooling system flushing procedures are provided in
Chapter Three. Drain and refill procedures are described
in Chapter Four.
Table I and Table 2 are located at the end
ofth
is chap-
ter.
NOTE
Except where s
pec
ified. F
and
D series en-
gine
s are included when a basic modelnum -
ber is specified. For example,
if
model 3GM
is called out in a procedure. the procedure
also applies 10
3GMD
and
3GMF.
COOLl:'\G
SYSTEMS
Seawater
(Sta
ndard)
Cooling System
All engines arc equipped with a seawater cooling sys-
tem. The water in which the boat is being operated is used
as a coolant to absorbengine heat. Water from outside the
boat passes through the water intake to the impeller-type
seawater pump located on the engine (Figure
I , typical).
The seawater pump sends the water to the engine for cir-
culation through the engine block. head and manifold.
A thermostat controls water circulation to provide
quick engine warm-up and maintain a constant operating
temperature.
R
ef
er to typical cooling system diagrams in Figure 2.
Fig
ure
3 and Figure 4.
To Next Page
Loading...
