
CAUTION
DO
NOT
use a scoop-type through-hull fitting as a means of supplying sea water
to
the en-
gine. Water pressure against this type of fitting, while the vessel is under sail, can push
sea
water past the sea water pump's impeller into the engine's exhaust system, filling it and the
engine as well. Flush-type, clear, through-hull fittings are recommended and should be lo-
cated on the hull so as
to
be below the waterline during
all
angles
of
boat operation.
The use
of
common-type street elbows
is
not recommended for plumbing the sea water cir-
cuit. These generally have very restrictive inside diameters. Machine fittings are preferred.
To
Fresh
Water
Circulating
Pump
Inlel
on
Engine
Block
~iI
~
.:,~.:
',-
'.':
. :
~
.
r:J
r-"\.
Fresh
Water
Pressure
Fill
Cap
" Y
'<W:?'~
,,'
"
'FRESH
~~~~
/~
"
WATER
~~
/
Thermostat
~
,f"
~(
Incoming
Sea
Water
Exhaust
Manifold
/~-,
Sea
Water
Impeller
Pump
I
J
Coolant
Recovery
Tank
To
Transmission
Oil
Cooler
111ustrated
above
is
the cooling system for the W 40NA engine
19 Westerbeke Diesel
Engines
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