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 29 of 736
TM 9-2815-225-34&P
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THEORY OF OPERATION (Contd)
ENGINE OIL SYSTEM COMPONENTS AND PIPING
Breather Tube (1) – Allows fumes from hot oil to escape.
Oil Filler (2) – Located in front rocker arm cover. Used for replenishing oil supply.
Oil Pump (3) – Circulates oil through engine to provide cooling and lubrication.
Oil Cooler (4) – Coolant circulates through internal tubes of cooler and carries away heat from
engine oil.
Primary Oil Filter (5) – Throwaway filter removes dirt and foreign particles from oil.
Bypass Oil Filter (6) – Throwaway filter provides filtration when primary filter is clogged or damaged.
Oil Return Line (7) – Carries return oil from turbocharger to engine block.
Oil Level Dipstick (8) – Indicates engine oil level.
Oil Supply Line (9) – Carries oil under pressure to cool and lubricate turbocharger.
Figure 1. Engine Oil System Components and Piping.
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