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 TM 55-1905-219-14-10
5-33. ENGINE ASSEMBLY - REMOVAL AND RUN IN - MAINTENANCE
INSTRUCTIONS (Continued).
LOCATION
ITEM
ACTION
REMARKS
ENGINE RUN-IN INSTRUCTIONS
12. Generator
a. Following a complete overhaul or any major repair
engine
job involving the installation of piston rings,
gine should be "run-in" on a dynamometer prior
to release for service.
b. The dynamometer is a device for applying specific
loads to an engine. It permits the serviceman to
physically and visually inspect and check the
engine while it is operating. It is an excellent
method of detecting improper tune-up, misfiring
injectors, low compression and other malfunctions,
and may save an engine from damage at a later
date.
c.
The operating temperature within the engine affects
the operating clearances between the various moving
parts of the engine and determines to a degree how
the parts will wear. Normal coolant temperature
(160- 185 .) should be maintained throughout the
F
run-in.
d. The rate of water circulation through the engine on
a dynamometer should be sufficient to avoid having
the engine outlet water temperature more than 10 .
F
higher than the water inlet temperature. Though a
10rise across an engine is recommended, it has
been found that 15temperature rise maximum can be
permitted.
e. A thermostat is used in the engine to control the
coolant flow; therefore, be sure it is in place
and fully operative or the engine will overheat
during the run-in. However, if the dynamometer has
a water stand-pipe with a temperature control regu-
lator, such as a Taylor valve or equivalent, the
engine should be tested without. Thermostats.
f.
The Basic Run-in Horsepower Scheduleis shown below
The horsepower shown in the table is at SAE condi-
tions: dry air density .0705 lb/cu .ft., air temper-
ature of 85 ., and 500 ft. elevation.
F
5-518
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