
Starting
System
The W 40NA diesel engine uses an electric starter for both normal and cold weather starting. A cold start aid
system is furnished
on
the W 40NA engine as standard equipment (part #36258). Both the thermostart device
and
the
cold
start aid are located
on
the air intake, manifold side
of
the engine. The PREHEAT button ener-
gizes the thermostart device assists
in
vaporizing the fuel at the intake manifold inlet. The vaporized diesel
fuel
is drawn
into
the cylinder during cranking and allows
for
easy combustion during compression. This
process
allows the engine
to
start rapidly and reduces wear on the starter.
Air
I ntake Screen
Stand Pipe
Thermostart
Cold Start Aid
The W 40NA engine's electrical system is designed so that the PREHEAT button must be depressed
for
the
time specified in the
"Preheat" chart shown on page
26.
While keeping the PREHEAT button depressed, the
START
button must
be
pressed
to
crank the engine.
NOTE: The
START button will
not
crank the engine unless the PREHEAT button is depressed
atthe
same time. When the PREHEAT button is depressed, the thermostart device is activated.
USE THE PREHEAT
BUnON
ONLY AS NECESSARY. Overuse
of
the PREHEAT button will
overheat the thermostart device.
Refer
to
the "STARTING PROCEDURE" section
of
this manual
for
starting instructions, page 26
23
Westerbeke
Diesel
Engines
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