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 TM 55-1905-220-14-10
5-33. ENGINE ASSEMBLY-REMOVAL AND RUN-IN-MAINTENANCE INSTRUCTIONS.
LOCATION
ITEM
ACTION
REMARKS
ENGINE RUN-IN INSTRUCTIONS
12.
a.
Following a complete overhaul or any major repair
engine
job involving the installation of piston rings, pistons,
cylinder liners or bearings, the engine 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 (160185 .) should be
-
F
maintained throughout the 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 . higher
F
than the water inlet temperature. Though a 10rise across
an engine is recommended, it has been found that 15
temperature 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 regulator, such as a Taylor valve or equivalent, the
engine should be tested without thermostats.
f.
The Basic Run-in Horsepower Schedule is shown in the
Table. The horsepower shown in the table is at SAE
conditions: dry air density .0705 lb/cu. ft., air temperature of
85 ., and 500 ft. elevation.
F
5-526
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