WATER
HEATER
CONNECTIONS
WATER
HEATER
INSTALLATIONS
This engine
is
equipped with connections for
the
plumbing
of
engine coolant
to
heat an on-board water
heater.
The water
heater should
be
mounted in a convenient location either in a
high or low'position
in
relation
to
the engine,
so
that the con-
necting hoses from the heater to the engine can
run
in
a rea-
sonably direct line without
any
loops which might trap
air.
Hoses should rise continuously from their low point at the
heater
to
the engine
so
that air will rise naturally from the
heater
to
the engine.
If
trapped air
is
able
to
rise
to
the heater,
then
an
air bleed petcock must be installed at the higher
fit-
ting
on
the heater for bleeding air while filling the system.
NOTE:
If
any portion
of
the
heating circuit
rises
above
the
engine
j closed cooling system pressure
cap,
then
a pressur-
ized (aluminum)
remote
expansion tank
(Kit
#024177) must
be
installed
in
the
circuit
to
become
the
highest point.
Tee
the
remote
expansion tank
into
the
heater
circuit,
choosing
the
higher
of
the
two
connections for
the
return.
Tee
at
the
heater,
and plumb a single
line
up
to
the
tanH location and
the
other back
to
the
engines
return.
Install
the
remote
expansion tank
in
a
c_onvenient
location
so
the
fresh water
coolant level
can
easily
be
checked.
The
remote
expansion
-tank
will
now
serve
as
a check and system fill
point.
The
plastic coolant recovery tank
is
not used
when
the
remote
expansion tank kit
is
installed, since
this
tank serves
the
same
function.
HEATER
ABOVE
THE
ENGINE
THERMOSTAT
HOUSING
NOTE:
The
remote
expansion tank
is
for filling and
the
expansion
of
coolant.
Water
heater coolant flow
need not
go
through
the
tank.
The pressure cap on the engine's manifold should
be
installed after the engine's cooling system
is
filled with
coolant. Finish filling the cooling system from the remote
tank after the system
is
filled and
is
free of air
and
exhibits
good coolant circulation. During engine operation, checking
the engine's coolant should
be
done at the remote tank
and
not at the engine manifold cap. The hose connection
from
the
heater
to
the remote expansion tank should
be
routed
and
supported
so
it rises continuously from the heater
to
the tank,
enabling any air in the system
to
rise
up
to
the tank
and
out
of the system.
NOTE:
Air bleed petcocks
are
located
on
the
engine
j heat
exchanger and
on
the
thermostat
housing.
Open
these
pet-
cocks when filling
the
engines fresh water system
to
allow
air
in
the
coolant circuit
to
escape.
Close
tightly after all
the
air
is
removed.
THERMOSTAT
HOUSING
HEATER
BELOW
THE
ENGINE
HOSE
CONNECTIONS
The hose adapters (nipples) corning off the'engine
(thermostat housing and water pump housing) are sized
for
3/8" I.D. hose. An adapter
is
available (#302391) that
will increase the size
to
5/8" I.D. hose.
ADAPTER
PN
302391
·33
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