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 TM 55-1905-219-14-10
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 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
(160-185F) should be 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 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 permitted.
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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