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Westerbeke 108B Manual de instalación Pagina 20

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COOLING
SYSTEM
THERMOSTAT
A thermostat, located near the manifold
at
the front
of
the
engine, controls the coolant temperature as the coolant
continuously flows through the closed cooling circuit.
When the engine is first started, the closed thennostatpre-
vents coolant from flowing (some coolant
is
by-passed
through a hole
in
the thermostat to prevent the exhaust
manifold from overheating). As the engine warms up, the
thermostat gradually opens. The thermostat
is
accessible
and
can be checked, cleaned, or replaced easily. Carry a
spare theimostat and gasket.
THIS
HOSE
CLAMP
COOLANT
PRESSUIRE
CAP--\\
REPLACING
THE
THERMOSTAT
1.
Drain
off
some coolant: Release the coolant pressure cap
and drain
the
coolant to the approximate
level
off the
thermostat housing. This can be done using
the
heat
exchanger drain plug.
2. Rotate the
thermostat
assembly: Loosen
the
hose clamp
as shown and remove the three allen screws that hold
down the thermostat housing cover, the assembly
can
now
be
twisted enough
to
access the gasket and thermostat.
3. Remove/replace the gasket
and
thermostat:
When
installing the new parts, apply a thin coat
of
sealant
on
both side
of
the gasket before pressing it into place.
HEAT
EXCHANGER
,
~-assemble
:n;:t:
Thm
the cover
back
into place and
~7''''
___
~
( tighten the three screws.
Do
not over-tighten! Tighten the
THERMOSTAT
ASSEMBLY
GASKET
SEAL
WITH
Hh'A"'i
COOLANT
SWITCH
PASSAGE
(KEEP
CLEAN)
l~
hose clamp and tighten the dntins.
Top
off
the coolant and
mn
the engine. Check for normal temperature and for any
leaks around the thermostat assembly.
A
CAUTION:
The
engine
lIJust
be
allowed
to
cool
down
before
attempting
these
procedures_
Not
only
is
the
surface
of
the
engine
hot
but
coolant
temperatures
can
be
at
190·
F.
1I'1r)+---JIIR
BLEED
.
PETCOCK
THERMOSTAT
HOUSING
COVER
I;ng/nes.& GllheratQrs
. 14 . .
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