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 TM 55-1905-223-24-3
CAUTION
Do not stop the engine immediately after the last run-in step is completed.
Serious engine damage can result.
b. Checks During Run-In. During engine run-in, make the following checks frequently.
(1)
Oil Pressure. Pressure must not change while the engine is operating at a given rpm.
(a) Oil pressure should be 15 psi at idle speed.
(b) Oil pressure should be 50-70 psi at rated speed.
(c) Check the oil temperature. If the oil temperature rises above 225 (107 ), stop the engine,
F
C
locate the problem, and make the necessary corrections. Refer to Table 2-2.
NOTE
Check the oil pressure when the temperature of the oil in the oil pan is at 200 to
225 (93 to 107 ).
F
C
(2)
Engine Coolant. Temperature of engine coolant must be between 160 (71 ) and 200
F
C
F
(93 ) during engine operation.
C
2-10. Governor Speed Check and Adjustment. Before applying a "LOAD" to the generator, check the
governed speed of the engine (2) and adjust as required.
a. Idle Speed.
(1)
Place the Idle-Run Switch on the engine instrument panel in the "Idle" position (Figure 2-1).
(2)
Start the engine.
(3)
Check the idle speed on the tachometer. It should reach 600 to 650 rpm.
NOTE
Adjust the idle speed potentiometer as necessary by turning the adjusting screw
on the instrument panel (Figure 2-1) and monitor the engine tachometer to
correct engine idle speed.
b. Run Speed.
(1)
Move the Idle-Run Switch to the "Run" position.
(2)
Check the NO-LOAD governed speed. It should be 60 Hz/1800 rpm.
(3)
If required, adjust the run speed potentiometer until the NO LOAD speed is correct.
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