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 TM 55-1905-220-14-10
5-4. MAIN PROPULSION ENGINE/MARINE GEAR - REMOVAL AND RUN-IN
MAINTENANCE INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
RUN IN (Cont)
11
The restriction at this point should be checked at a specific engine speed. Then the air
cleaner and ducting should be removed from the air inlet housing and the engine again
operated at the same speed while noting the manometer reading. On turbo-charged
engines, take the reading on the inlet side of the turbocharger. The difference between
the two readings, with and without the air cleaner and ducting, is the actual restriction
caused by the air cleaner and ducting.
12
Check the normal air intake vacuum at various speeds (at no-load) and compare the
results with the Engine Operating Conditions in Chapter 3. Record these readings on
the Engine Test Report.
13
Check the exhaust back pressure (except turbo-charged engines) at the exhaust
manifold companion flange or within one inch of this location.' This check should be
made with a mercury manometer through a tube adaptor installed at the tapped hole.
If the exhaust manifold does not provide a 1/8" pipe tapped hole, such a hole can be
incorporated by reworking the exhaust manifold. Install a fitting for a pressure gage or
manometer in this hole. Care should be exercised so that the fitting does not protrude
into the stack. On turbo-charged engines, check the exhaust back pressure in the
exhaust piping 6" to 12" from the turbine outlet. The tapped hole must be in a
comparatively straight area for an accurate measurement. The manometer check
should produce a reading in inches that is below the Maximum Exhaust Back Pressure
for the engine.
14
Turbocharger compressor outlet pressure and turbine inlet pressures are taken at full-
load and no-load speeds.
5-33
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