Home » Cummins N14 » Cummins N14 – Lubricating Oil Pump – Rebuild – Assembly

Cummins N14 – Lubricating Oil Pump – Rebuild – Assembly

Use clean 15W-40 oil to lubricate the drive shaft.
Install the drive shaft, from the gear pocket side of the oil pump body, into the drive shaft bore.
Use clean 15W-40 oil to lubricate the inside diameter of the oil pump main drive gear.

Install the oil pump body and the drive shaft assembly in an arbor press.
Support the end of the drive shaft, and press the main drive gear onto the shaft.
NOTE: At this stage of assembly, there must not be more than 0.30 mm [0.012-inch] end clearance between the main
drive gear and the oil pump body. Use a dial indicator located on the end of the lubricating oil pump drive shaft to
make this measurement.

Lubricate the inside diameter of the bushings in the driven gear with clean 15W-40 oil.
Install the driven gear on the shaft.

Install the high oil pressure relief valve as follows:
1. Install locating plate, Part No. 3376013 (in DFC pressure valve fixture, Part No. 3376011) on the oil pump body.
NOTE: Use two 5/16 – 18 X 1 1/4-inch capscrews. Do not tighten the capscrews at this time.

Install the large diameter of valve mandrel, Part No. 3376012, through the locating plate into the pressure limit
valve bore in the oil pump body.
Tighten the capscrews, and remove the mandrel.

Install the spring (4), the washer (3), the valve disc (2), and the retainer plug (1) into the bore of the locating plate.
NOTE: Make sure the prongs on the disc are down (toward the washer) and that the cup side of the retainer plug is up
(toward the mandrel).

Install the small end of valve mandrel, Part No. 3376012, into the bore in the locating plate.
Install the assembly in an arbor press.
Press the mandrel until the large diameter of the mandrel is against the locating plate.

Remove the assembly from the arbor press.
Remove the mandrel and locating plate from the oil pump body.

Install a new gasket and the cover to the pump body.
NOTE: Tap the cover lightly with a rubber hammer to push the cover over the dowels.
Install the capscrews and the washers. Tighten the capscrews.
Torque Value: 25 N•m [20 ft-lb]
Turn the gears to make sure they rotate freely.

Install new o-rings on the main oil pressure regulator plunger retainer plug. Lubricate the o-rings with vegetable oil.
Install the plunger (4), the spring (3), the retainer plug (2), and the capscrew (1).
Tighten the retainer plug capscrew.
Torque Value: 25 N•m [20 ft-lb]

Install a new o-ring on the adapter elbow. Lubricate the o-ring with clean 15W-40 oil.
Install the adapter elbow into the lube pump cover. Tighten the adapter.
Torque Value: 7 N•m [60 in-lb]
NOTE: The adapter must be positioned to align with the DFC signal line.