Quantcast AIR INLET AND EXHAUST SYSTEM - TM-5-2815-232-140151

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WOODWARD UG8 LEVER GOVERNOR
TESTING AND ADJUSTING
AIR INLET AND EXHAUST SYSTEM
RESTRICTION OF AIR INLET AND EXHAUST
There will be a reduction of horsepower and
efficiency of the engine if there is a restriction in the air
inlet or exhaust system.
Air flow through the air cleaner must not have a
restriction (negative pressure difference measurement
between atmospheric air and air that has gone through
air cleaner) of more than 762 mm (30 in.) of water.
Back pressure from the exhaust (pressure
difference measurement between exhaust at outlet
elbow and atmospheric air) must not be more than 686
PRESSURE TEST LOCATION
mm (27 in.) of water.
1. Inlet water elbow to aftercooler. 2. Elbow or plug for
aftercooler air chamber pressure.
MEASUREMENT OF PRESSURE IN INLET MANIFOLD
Use the 6V3150 Engine Pressure Group to
The efficiency of an engine can be checked by
check the pressure in the inlet manifold.
making a comparison of the pressure in the inlet
manifold with the information given in the FUEL
SETTING AND RELATED INFORMATION FICHE. This
test is used when there is a decrease of horsepower
from the engine, yet there is no real sign of a problem
with the engine.
The correct pressure for the inlet manifold is
given  in  the  FUEL  SETTING  AND  RELATED
INFORMATION FICHE. Development of this information
is done with these conditions:
a.
737 mm (29 in.) of mercury barometric
pressure (dry).
29 C (850 F) outside air temperature.
b.
6V3150 ENGINE PRESSURE GROUP
c.
35 API rated fuel.
1. Differential pressure gauges. 2. Zero adjustment
screw. 3. Pressure gauge 0 to 100 kPa (0 to 160 psi).
On a turbocharged aftercooled engine, a change
4. Pressure tap. 5. Pressure gauge 0 to 415 kPa (O to
in fuel rating will also change horsepower and the
60 psi).
pressure in the inlet manifold. If the fuel is rated above
35 API, pressure in the inlet manifold can be less than
This tool group has a gauge to read pressure in
given  in  the  FUEL  SETTING  AND  RELATED
the inlet manifold.
Special Instruction, Form No.
INFORMATION FICHE. If the fuel is rated below 35 API,
SEHS7851 is with the tool group and gives instructions
the pressure in the inlet manifold can be more than given
for its use.
in the FUEL SETTING AND RELATED INFORMATION
FICHE.
BE SURE THAT THE AIR INLET AND
EXHAUST DO NOT HAVE A RESTRICTION WHEN
MAKING A CHECK OF PRESSURE IN THE INLET
MANIFOLD.
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