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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
REMOVAL (Cont)
14. Vehicle
Lift engine
Deck
RUN IN
15. MAIN PROPULSION ENGINE.
a. Following a complete overhaul or any major repair 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 e 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 maintained throughout the run-in.
-
F
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 than the water inlet temperature. Though a 10rise
F
across an engine is recommended, it has been found that a 15temperature rise maximum can be permitt6d.
e. Thermostats are used in the engine to control the coolant flow; therefore, be sure they are 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 equipment, then 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
5-23
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