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Cooling System
Monitor
system coolant
(50/50 antifreeeze mixture)
and,
if rust
or
scale are evident, flush and clean system and replenish the antifreeze
mixture.
Use antifreeze that is compatible with aluminum engine com-
ponents.
Maintain proper belt tension on the fresh water circulating pump and
sea water pump,
three-eighths to one-half
inch deflection along the
belt's longest span.
Replace if cracked or
fr ayed.
Do not over-
tighten
as
it
is
possible
to
bend
the
governor
shaft
by
over-
tightening.
Check
the
impeller
in
the
sea
water
pump.
flexible and not cracking.
Ensure
the
vanes
are
Check
the
sea
water
pump
for
wear
on
the
front
cover,
cam plate
and inner wear plate.
An
excessively-worn
pump
will
not
pump
efficiently,
resulting
in
improper cooling.
Cylinder Head and Valves
Tighten
cylinder
head
bolts
in
the
sequence
should
be
cold.
Loosen
each
bolt
one-eighth
before tightening in the sequence shown.
shown.
The
eng ine
to one-quar ter
tur n
.,
"0
"en
_
C
o
-
.t
®
®
®
I
Tightening Sequence
30
Head bolt tightening torque:
32 - 43.4 lb-ft
(5.0 - 6.0 kg-m)
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