Home » ISX11.9 CM2250 - Service Manual » Cummins ISX11.9 CM2250 – Service Manual 007-031   Lubricating Oil Pump

Cummins ISX11.9 CM2250 – Service Manual 007-031   Lubricating Oil Pump

Preparatory Steps

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 WARNING 

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

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Remove

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Remove the four capscrews and the oil pump.

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Disassemble

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 WARNING 

The high-pressure relief valve spring is under compression. Slowly remove the threaded retaining plug to reduce the possibility of personal injury.

Remove the high-pressure relief valve and spring by removing the threaded retaining plug from the lubricating oil pump cover. Refer to Procedure 007-021 in Section 7.

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 WARNING 

The pressure regulator spring is under compression. Slowly remove the threaded retaining plug to reduce the possibility of personal injury.

Remove the lubricating oil pressure regulator and spring by removing the threaded retaining plug on the bottom of the lubricating oil pump.

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Do not remove the external drive gear or external idler gear.

If the external drive gear or external idler gear is damaged, replace the lubricating oil pump.

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Remove the eight assembly capscrews, four capscrew sealing washers, and the lubricating oil pump cover.

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Do not remove the internal drive gear. If the internal drive gear is damaged, replace the lubricating oil pump.

Remove the idler pumping gear and shaft from the lubricating oil pump body.

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Clean and Inspect for Reuse

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 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 

Some solvents are flammable and toxic. Read the manufacturer’s instructions before using.
 CAUTION 

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

Clean the lubricating oil pump components with solvent.

Use a bristle brush to clean any internal ports.

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 WARNING 

When using a steam cleaner, wear safety glasses or a face shield, as well as protective clothing. Hot steam can cause serious personal injury.
 WARNING 

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

Use a steam cleaner to rinse the components.

Dry with compressed air.

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Inspect the following areas of the lubricating oil pump for damage or blockage.

  • Lubricating oil pump body gear cavity
  • Inlet and outlet ports
  • Internal oil passages
  • Lubricating oil pump housing body
  • Pressure regulator bore
  • High pressure relief bore and seat.

If the lube pump housing is damaged, it must be replaced.

Inspect the bushings for scuffing and wear.

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Inspect the lubricating oil pump cover for damage.

Inspect the bushing for scuffing and wear.

If the marks on the lubricating oil pump cover can be felt with a fingernail, the cover must be replaced.

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Inspect the pressure regulator spool for scuffing.

Minor spool scuff is acceptable. If the scuff can be felt by a fingernail, the spool will need to be replaced.

Insert the spool in the bore and check for smooth movement in and out of the bore. If any hesitation is felt, the spool must be replaced and the bore inspected for burrs.

Remove any burrs found in the bore before installing a new spool.

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Inspect the pressure regulator spring for broken coils or rust.

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Inspect the external idler gear for cracks, chips, and broken teeth.

If the external idler gear is damaged, the lubricating oil pump must be replaced.

Check the idler gear bushing (bore) for wear and scuffing.

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Inspect the external drive gear for cracks, chips, and broken teeth.

If the external drive gear is damaged, the lubricating oil pump must be replaced.

Check the drive gear bushing (bore) for wear and scuffing.

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Inspect the lubricating oil pump internal gears for excessive wear, cracks, or broken teeth.

Erosion and pitting on the tip and root of the gear tooth is unacceptable. The lubricating oil pump must be replaced if erosion or pitting is found.

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Inspect the internal drive gear and shaft assemblies for damage.

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Assemble

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Install the internal idler gear into the lubricating oil pump cover.

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No gasket is used when installing the lubricating oil pump cover.

Install the cover to the lubricating oil pump.

Install the sealing washers over the four lower capscrews.

Tighten the center capscrews first, then the outside capscrews.

Install the eight capscrews and tighten.

Torque Value:  35  n.m  [26 ft-lb]

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Lubricate the oil pressure regulator valve and bore with clean engine oil.

Install the spring, valve, and threaded retaining plug.

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Install the high-pressure relief valve and spring into its bore in the lube pump housing. Refer to Procedure 007-021 in Section 7.

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Turn the main drive gear by hand to check the gears for freedom of rotation.

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Measure the gear backlash by mounting a dial indicator. Position the dial indicator contact point onto the lubricating oil pump external idler gear teeth.

With the external drive gear locked into place and the dial indicator contact in place, rotate the external idler gear clockwise and counterclockwise to measure the backlash.

Lubricating Oil Pump Gear Backlash

mm in
0.05 MIN 0.002
0.38 MAX 0.015

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Install

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Align the dowels on the lubricating oil pump with the mounting holes in the cylinder block.

Install the lubricating oil pump and the four capscrews.

Tighten the capscrews.

Torque Value:  47  n.m  [35 ft-lb]

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Use a dial indicator to check the lubricating oil pump idler gear backlash.

Lubricating Oil Pump Idler Gear Backlash

mm in
0.05 MIN 0.002
0.38 MAX 0.015

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Finishing Steps

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Last Modified:  03-Aug-2010