TM-9-2815-225-34-P
ENGINE, DIESEL: 6 CYLINDER IN-LINE TURBOCHARGED, CUMMINS MODEL NTC-400
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE MANUAL INCLUDING REPAIR PARTS AND SPECIAL TOOLS LIST
JULY 2005
TM-9-2815-225-34-P - Page 237 of 736
TM 9-2815-225-34&P
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OIL PUMP (Contd)
Figure 3. Oil Pump Disassembly—Big Cam III.
BIG CAM III (Contd)
Cleaning and Inspection (Contd)
6.
Inspect coupling (16) for cracks or stripped teeth.
7.
Inspect oil pump driveshaft (10) and idler shaft (21) for galling, breaks, cracks, or bends.
8.
Using micrometer or equivalent, measure oil pump driveshaft (10) and idler shaft (21) outside
diameter. Minimum outside diameter is 0.874 in (22.20 mm).
9.
Inspect woodruff key (9) for damage and woodruff key slot on oil pump driveshaft (10). Replace
woodruff key (9) and oil pump driveshaft (10) if woodruff key (9) fits loose in slot.
10.
Inspect pressure regulator plunger (22) for movement in bore of oil pump body (3). Replace
pressure regulator plunger (22) if it sticks, binds, or is excessively loose.
11.
Inspect bypass valve disc (6) for movement in bore of oil pump body (3). Replace bypass valve
disc (6) if it sticks, binds, or is excessively loose.
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