Westerbeke 4.5 KW BGC -60Hz Manual del operador Pagina 51
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COOLING SYSTEM
Description
Westerbeke marine gasoline engines are designed and equipped
for
fresh water cooling. Heat produced in
the engine
by
combustion and friction
is
transferred
to
the fresh water which circulates throughout the en-
gine. This circulating fresh water cools the engine block and
tts internal moving parts. The heat is transferred
externally from the fresh water
to
sea water by means
of
a heat exchanger, similar in function
to
an automo-
tive radiator.
Sea water flows through the tubes
of
the heat exchanger
While
fresh water flows around the
tubes; engine heat transferred
to
fresh water is conducted through the tube walls
to
the sea water which
is
pumped into the exhaust system and discharged overboard. In basic terms, the engine
is
cooled
by
fresh
water, the fresh water
is
cooled
by
sea water, and the sea water carries the transferred heat over the side
through the exhaust system. The fresh water and sea water circuits are independent
of
each other. Using
only fresh water within the engine allows the
cooling water passages
to
stay clean and free from harmful
deposits. The
two
independent circuits and their components are discussed in the following paragraphs.
Fresh
Water
Circuit
NOTE: Refer
to
paragraphs A and B in this section on the recommended antifreeze and water
mixture
to
be used as the fresh water coolant, and for information on filling the fresh water
system.
Fresh water
Is
pumped through the engine by a belt-driven circulating pump, absorbing heat from the en-
gine. The fresh water coolant circulates through the engine's block absorbing heat, then passes through
the thermostat into the exhaust manifold, then
to
the heat exchanger where
tt
is
cooled, and then is returned
to the engine block through the suction side
of
the fresh water circulating pump. When the engine
is
started
cold, external fresh water flow
is
prevented
by
the closed thermostat (although some fresh water flow is
bypassed around the thermostat
to
prevent the exhaust manifold from overheating). As the engine warms
up, the thermostat gradually opens, allowing the engine's fresh water coolant
to
flow unrestricted
to
the ex-
ternal portion
of
the cooling system.
A. Fresh Water Coolant (Antifreeze) Mixture.
A freshwater and antifreeze mixture should be used year-round. Water, when
tt
freezes, expands sufficient-
ly
to
split the heat exchanger and crack the engine block. A water/antifreeze mixture
of
proper concentra-
tion will prevent freezing (see page 49 for an antifreeze/water mixture chart).
Use soft water with few
impurtties, such as tap water (potable water)
or
rainwater. Never use hard
or
foul
water. Use of hard water
or
water containing impurities will lead to the collection
of
scale in the engine and
heat exchanger which will reduce the cooling system's efficiency.
Antifreeze of
poor
quality
or
without rust inhibitors will cause corrosion within the
COOling
system. Always
use antifreeze which is compatible with aluminum
cooling system components and which
is
made
by
a reli-
able manufacturer. Never
mix
different brands
of
antifreeze.
Make sure that the
cooling system
of
the engine
is
well cleaned before adding antifreeze.
Recommended antifreeze
for
year round use
is
ZEREX
or
PRESTONE with rust inhibitors.
In order
to
control the concentration
of
the mixture, mix the antifreeze and fresh waterthoroughly before ad-
ding it
to
the cooling system.
Westerbeke Generators
48
- WESI'ERBEKE 1
- Engines & Generators 2
- SAFETY PRECAUTIONS 3
- I WESTERBEKE 5
- Generators 6
- Understanding 8
- Ordering 8
- Marine Gasoline Generator 12
- Pressure 12
- Westerbeke Generators 12
- & Stroke 17
- 90 - 125 (Ampere-Hours) 19
- ± 3 Hertz (5%) 20
- MOUNTING 23
- """u"i 24
- ." 25
- :' 26
- 35 Ib-in, or 0.27 27
- --"..::---~~-~~.:::.-.: 28
- -:::::=:~--:-d 28
- _'-'...\ 28
- ELECTRICALLY 29
- DEFLECTION 30
- Automatic Shutdown 31
- + ) battery connection 32
- 4.0KW, and page 17 for the 33
- (NORMRL 36
- C) before ap 37
- + path for voltage to 38
- SCREENED 41
- CLEANER 41
- IIPPIIOII£II 42
- ~~~::-t--Magnet 43
- IGNITION 44
- + and - 45
- O.C.Charge 46
- 't~ 47
- ;l' 48
- . " 49
- 1~~I~:r~25f~~2r~t~:t 50
- "r 52
- FUNCTION 53
- MANIFOLD 53
- PRESSURE 53
- CRAUSHAFT 55
- OVERHERT 56
- 44m#¥tlw*!2:o#i@> 57
- IlliI'III1T?" 58
- Westerbeke 59
- Crankcase 59
- '-'0 60
- 60
- 110v 50 Hz 61
- 220v 50 Hz 61
- '" 62
- ~WARNINGI 63
- "'" 64
- 1 b 4 3 65
- ,,--> 66
- 60 120 240 68
- + ) at overspeed switch 69
- H the bear 75
- -\--~~~ 76
- HuntinglBeculatjQo 77
- 75 Westerbeke Generators 78
- ~~~Yl~~~~~~~ 79
- 8(G Ii.SlW 80
- TIGMTEKIKG 80
- SEQUENCE 80
- 360'. The valves for 81
- 9.4 Ib·ft (0.7 - 1.3 kg-m) 81
- If batteries are 85
- 1.5 - 1.8 87
- YOUR NOTES 95
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