Cummins N14 STC, Celect, Celect Plus – Service Manual 007-031   Lubricating Oil Pump

WARNING  Some state and federal agencies have determined that used engine oil can be carcinogenic and cause reproductive toxicity. Avoid inhalation of vapors, ingestion, and prolonged contact with used engine oil. If not reused, dispose of in accordance with local environmental regulations.

WARNING  To reduce the possibility of personal injury, avoid direct contact of hot oil with your skin.

• Drain the lubricating oil system. Refer to Procedure 007-037 in Section 7.
• Remove the lubricating oil transfer tube. Refer to Procedure 007-040 in Section 7.

Remove the demand flow cooling signal line between the cylinder block main oil rifle and the lubricating oil pump.

Remove the five capscrews which hold the lubricating oil pump to the cylinder block.

NOTE: Do not pry on the lubricating oil pump mounting flange.

Remove the lubricating oil pump from the cylinder block gear flange. Discard the gasket.

CAUTION  Do not allow dirt or gasket material to enter the oil passages. Bearing damage can result.

Clean the lubricating oil pump and the cylinder block gasket surfaces.

CAUTION  Carefully remove the capscrew (1). The pressure regulator spring is under compression.

Remove the lubricating oil pressure regulator.

Refer to Procedure 007-029 in Section 7.

Remove the lubricating oil pump front cover and the lubricating oil pump driven gear.

Remove the 7/16-20 UNF straight thread with o-ring seal adapter and the power steering pump mounting flange cover from the lubricating oil pump cover.

Clean the gasket material from the lubricating oil pump body and cover.

Use an acetylene torch tip cleaner, or equivalent, that is 1.0 mm [0.04 in] or less in diameter to clean the orifice.

NOTE: The diameter of the orifice is 1.0 mm [0.04 in]. Do not
attempt to drill out the orifice or use a larger diameter wire to clean the orifice.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

CAUTION  Wear safety goggles when using an air solvent gun to prevent possible eye injury.

Use solvent and an air solvent gun to clean the signal line, the lubricating oil pump cover, and the body. Hold the driven gear off of the lubricating oil pump body when cleaning the gear bore area.

Dry with compressed air.

Inspect the gears for freedom of rotation and cracked or broken teeth.

Inspect the lubricating oil pump gears for cracked or broken teeth. Wear on the gear teeth face has not been detrimental to the lubricating oil pump life or low oil pressure. Wear is acceptable if backlash is within specifications.

Lock the idler gear to keep it from rotating by applying a clamp to the gear and the pump body as illustrated.

With the gear clamped and the dial indicator in place as illustrated, rotate the external drive gear clockwise
and then

counterclockwise
to measure and record the backlash in the pumping gears on the dial indicator.

Pumping Gear Backlash

Use depth calipers, or a dial indicator, to measure the drive shaft end clearance in two locations 90 degrees apart.

Drive Shaft End Clearance

Rebuild the lubricating oil pump if the driveshaft end clearance does

not meet specifications. Refer to the Engine Shop Manual.

Use 15W-40 oil to lubricate the shaft, the gears, and the bushings. Make sure to lubricate the area between the driven gear and the body.

Install the driven gear onto the shaft.

Install a new gasket on the pump body and install the cover.

Install the capscrews and tighten.

Check the gears for freedom of rotation in the pump.

Install the lubricating oil pressure regulator.

Refer to Procedure 007-029 in Section 7.

Install the power steering pump mounting flange gasket and cover. Tighten the capscrews.

Install a new gasket onto the mounting trunion of the lubricating oil pump.

Install the lubricating oil pump into the mounting hole in the cylinder block gear flange.

Install the five mounting capscrews. Tighten the capscrews.

Install the demand flow cooling signal line. Tighten the signal line fittings.

WARNING  Some state and federal agencies have determined that used engine oil can be carcinogenic and cause reproductive toxicity. Avoid inhalation of vapors, ingestion, and prolonged contact with used engine oil. If not reused, dispose of in accordance with local environmental regulations.

WARNING  To reduce the possibility of personal injury, avoid direct contact of hot oil with your skin.

• Install the lubricating oil transfer tube. Refer to Procedure 007-040 in Section 7.
• Fill the lubricating oil system. Refer to Procedure 007-037 in Section 7.
• Operate the engine until the water temperature reaches 82°C [180°F]. Check the oil pressure and check for oil leaks.