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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)
(b) The engine is connected through an universal
coupling to the absorption unit. The load on
the engine may be varied from zero to maximum
by decreasing or increasing the resistance in
the unit. The amount of power absorbed in a
water brake type dynamometer, as an example,
is governed by the volume of fluid within the
working system. The fluid offers resistance
to a rotating motion. By controlling the
volume of water in the absorption unit, the
load may be increased or decreased as required.
(c) The power absorbed is generally measured in
torque (lb. ft.) on a suitable scale. This
value for a given engine speed will show the
brake horsepower developed in the engine by
the following formula:
BHP = (T x RPM)/5250
Where:
BHP = brake horsepower
T = torque in lb. - ft.
RPM = revolutions per minute
(d) Some dynamometers indicate direct brake horse-
power readings. Therefore, the use of the
formula is not required when using these units.
(e) During the actual operation, all data taken
should be recorded immediately on an Engine
Test Report.
(3) Instrumentation
(a) Certain instrumentation is necessary so that
data required to complete the Engine Test
Report may be obtained. The following list
contains both the minimum amount of instru-
ments and the proper location of the fittings
on the engine so that the readings represent
a true evaluation of engine conditions.
5-920
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