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 TM 55-1905-223-24-5
2-5. Engine Break-in. The way a new engine is operated during the first 100 hours of service will have an
important effect on the life of the engine and its parts. Even though all engines are run on a dynamometer for
several hours before they leave the factory, an additional period of careful operation is required.
a. Engine Speeds. Avoid operation for long periods at engine idle speeds, or at maximum horsepower
levels in excess of 5 minutes.
b. Engine Instruments. Develop the habit of watching engine instruments closely during operation and
reduce speed if oil temperature reaches 250 (121 ) or coolant temperature exceeds 190
F
C
F
(88 ).
C
c. Oil Level. Check oil level every 10 hours during break-in period.
2-6. Preliminary Servicing and Adjustment. Follow these procedures when starting a new or rebuilt engine for
the first time.
a. Priming the Engine. Prime the fuel and lubricating oil systems before attempting to start the engine.
(1) Fill fuel filter with clean, No. 2 diesel fuel oil.
(2) Remove suction line from fuel pump (paragraph 2-33) and prelubricate gear pump with 2 to 3
oz. (50 to 60 cc) of clean lubricating oil, Item 1, Appendix C. Reconnect the suction line.
(3) Check Fuel Tanks. There must be an adequate supply of clean, No. 2 diesel fuel in the
tanks.
(4) If injector and valve or other adjustments have been disturbed by any maintenance work,
check to be sure they have been properly adjusted before starting the engine.
CAUTION
Remove oil inlet line from the turbocharger (paragraph 2-26) and prelubricate
bearing with 2 to 3 oz (50 to 60 cc) of clean lubricating oil, Item 1, Appendix C.
Reconnect oil supply line.
(5) Fill crankcase until oil appears on dipstick.
(6) Remove plug from lubricating oil filter head and use this opening as the oil priming point.
CAUTION
Do not prime engine lubricating system from bypass filter.
(7) Connect a hand or motor-driven priming pump hose from source of clean lubricating oil to
priming point.
2-2
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