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 TM 55-1905-220-14-11
5-69.
ENGINE ASSEMBLY - REMOVAL AND RUN-IN - MAINTENANCE INSTRUCTIONS
(Continued).
LOCATION
ITEM
ACTION
REMARKS
ENGINE RUN-IN INSTRUCTIONS (Cont)
11. The restriction at this point should be
checked at a specific engine speed. 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. 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 (see page 5-926).
13. Check the exhaust back pressure 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 inch
pipe tapped hole, such a hole can be incorpor-
ated by reworking the exhaust manifold.
Install a fitting for a pressure gage or
manometer in this hole. Care should be taken
so that the fitting does not protrude into the
stack. The manometer check should produce a
reading in inches that is below the Maximum
Exhaust Back Pressure for the engine.
14. Refer to the Basic Run-In Horsepower Schedule
(see page 5-919.), and determine the maximum
rated brake horsepower and the full-load speed
to be used during the Final Run-In. Apply the
load thus determined to the dynamometer. If a
hydraulic governor is used, the droop may be
adjusted at this time by following the pre-
scribed procedure. The engine should be run
at this speed and load for 1/2 hour.
5-929
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