Westerbeke 38B FOUR Betreibershandbuch Seite 29
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Exhaust Back-Pressure
The exhaust discharge hose must be of adequate size and mini-
mal
run
to
prevent excessive exhaust back-pressure. Exhaust
back-pressure should be checked before the engine is put into
~
service. (Refer
to
the illustration.) Excessive back-pressure will
~
affect the engine's performance.
To measure for
back-pressure, use a mercury manometer, a pres-
sure gauge,
or
a water column. A boatyard
or
marine mechanic
should have a manometer or a pressure gauge.
..
..
"
"
-Insulation
Exhaust
Elbow
Measure back-pressure at
the
exhaust elbow when the engine
is
running
at
3600
rpm. Back-pressure, as measured
by
a
manometer, a pressure gauge,
or
water column, should not be
over the specifications listed below.
2.
Exhaust
NOTE: Other pressure gauges may be available to test for
exhaust
baCk-pressure.
Check
with
a
competent
mechanic.
A water column can be made by taking a clear plastic tube and
taping one end of the tube
along a yardstick and fitting the other
end
of
the tube with a 1/4 inch NPT (National Pipe Tap) pipe fit-
ting.
Measure back-pressure at the exhaust
elbow when the engine is
running at 3600 rpm.
Dimension A cannot exceed 39 inches
of
water.
Back-pressure, as measured by a gauge instrument, should not
exceed the
following specifications:
Specilicalions:
3 inches
01
mercury (0.104 kg/cm
2
)
39 inches
01
water
in
a water column
(.099 kg/cm
2
at
4'
C)
22
ounces psi
1 1/2 psi
."
"
I~
~~
Mercury
Manometer
\
\
Excessive back-pressure can be caused
by
a small diameter exhaust hose, a small muffler, sharp bends in
the exhaust hose, improper fittings, water pockets, and a high volume
of
water
in
the exhaust system due
to
the length of the exhaust discharge hose. The use
of
elbows and fittings in the exhaust discharge hose's
routing should be limited since these will create flow restrictions and contribute
to
exhaust back-pressure.
The engine's exhaust system must be separate from any other engine's exhaust system. Dry portions of the
exhaust system
between the engine's exhaust manifold and the water injected exhaust elbow must be insu-
lated
to
hold in the heat.
21
Westerbeke Diesel Engines
- WESI'ERBEKE 1
- SAFETY PRECAUTIONS 2
- 1 Westerbeke Diesel 3
- . 4
- Diesel Engines 5
- Marine Diesel Engine 10
- Lift pump 11
- Oil Fill 12
- 90° Exhaust Elbow 12
- THREE MARINE DIESEL ENGINE 14
- GENERAL SPECIFICATIONS 14
- 6 ft (1.8 m) 15
- + 000 - 100) at full open 16
- + 000 - 100) at full open 19
- ± 0.5' BTDC (Static) 21
- AlnIl:Nan:~~~~~B~~==~' 23
- Rigging and 24
- Engines 24
- Westerbeke Diesel Engines 27
- Exhaust System 28
- ." 29
- * Manufactured 31
- + ) battery connection 34
- 190' 35
- Westerbeke 38
- 30 seconds at a time 41
- Break-In 43
- FITTING 45
- Iills. Prevent 46
- ,-----/---€,i\l--\ 49
- ----+fT 50
- ,----:---"1;" 51
- ~1l1)~,i 52
- 1'1 53
- FUNCTION 55
- MANIFOLD 55
- PRESSURE 55
- '1 56
- : i: ' 56
- REPLACE 57
- IMCOMING 59
- Crankcase 64
- NEUTRAL 66
- "j/ 68
- I I i 69
- 10-13/10-14 70
- Starling the Engine 71
- Shifting 71
- Freewheeling 71
- Cooling Problems 72
- Annual Checks 73
- Daily Checks 73
- Winter Checks 73
- General Checks 73
- Walter V-Drives 75
- RV'IO 76
- ~/LOCKING 77
- "H" 78
- Maintenance 79
- I terminal on the 81
- + and - ground 82
- + 140 psi 86
- W 42B FOUR Engine) 87
- ADJUST VALVES 88
- ~'"'' 89
- 50-50 solution 91
- 38B, and page 19 for 91
- Batleries 93
- 4. Check the condition 94
- QapSQ[9W 95
- A Starter 97
- Weslerbeke Diesel Engines 100
- YOUR NOTES 104
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