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2.
The exhaust line should be supported so that its weight does not rest on
the manifold flange.
3.
Use a flexible section preferably of
st~ess
steel
at
the manifold
f1~ge
(which should ,be
'W~a~ped
due
to'
fhe" high" "temperature)
and
no '"
--,
less than 12 inches .overalI
Iengf1i~
threaaEi¢[ at "eacn'"ena-.,
,"
4.
The exhaust pipe 'inust be of
suffici~nt
size to handle
th~
exnaust gases
from the engine properly and should never be made $maller than the
opening, of the exhaust
m~ifold.
The I. D. -of the exhaust should be
increased 1/2 inch for every ten feet of length beyond the first ten.
ENGINE COOLING SYSTEM
The Westerbeke Four-50 diesel is fresh water cooled, utilizing what is known as a
"closed system", wherein the fresh water is circulated by a centrifugal pump
through the engine biock and head, ·exhaust
manif~ld,_
and
he~t
exchanger. The heat
e~changer
is cooled by the sea water pump ..
FUE~ PI~ING
We recommend 1/4 inch O. D. copper tubing together with suitable fittings, both
for the. supply line and return line.
Run tne tubing in the longest pieces obtainable
to avoid .the u.se of unnecessary fittings and connectors.
The shut off valve
in
the
line between the fuel tank and engine should be of the fuel oil type, and it. is impor-
tant that
all
joints be free of pressure leaks.
Keep fuel lines as far as possible from exhaust pipe for minimum temperature to
eliminate
II
yapor lock.
I'
The fuel" piping leading from the tank to the engine compartment should always be
'securely anchored to prevent chafing.
Usually the copper tubing is secured by
m'eans of copper straps.
The final connection to the
eng~e
should be through the flexible rubber hoses
supplied •.
FUEL SUPPLY (see Fig. 2 for Fuel inj~ction P:t:imp lever control positions)
To
ensure satisfactory operation, a Diesel engine must have a dependable supply
of clean fuel oil.
For this reason, cleanliness and c'are are especially import,ant
at the time when the fuel tank is installed because dirt left anywhere in the fuel
lines or tank will certainly cause fouling of
~jector
nozzles when t:q..e engine is
started for' the first 'time. If a molded tank of fiberglas is used, be ce.rtain .that the
interior is _ gel- coated to prevent fibres from contaminating the fuel system.
In
the Westerbeke
D~esel
fuel system,
:;tIl
excess
0:(
fue,l oil is supplied to t:q.e injec-
tion pump by a fuel lift pump and the oversupply which is not required for injectic;>n
to the
e~g~e
is returned to the fuel tank.
Two' fuel 'filters are provided with the engine; one is an i,ntegral part of the fuel lift
pump (called the Primary Filter), the other mounted on the engine (called the
Secondary Filter).
The Primary Unit has a bowl and screen, the purpose of which
is to trap water and has the advantage that the owner
can
tell at a glance if water
or dirt is collecting in the glass bowl.' The Secondary Filter is a replacement ele-
ment type, the purpose of which is to filter all contaminants before -the fuel oil
reaches the injection system.
Connection for the fuel supply line is on the fuel lift
pump which has a hand primer required for filling the fuel supply lines and the
filters, and for purging the" system
of
air when engine is started for the first time,
or whenever the system has been opened for any reason.
12
(
(
,
'-."
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