ISM, ISMe, and QSM11 – Lubricating Oil Pressure Low

Electronic fault codes active or high counts of inactive fault codes

View and troubleshoot the fault codes with INSITE™ electronic service tool. Refer to Section TF in the Troubleshooting and Repair Manual, Electronic Control System, ISM and QSM11 Engines, Bulletin 3666266. Refer to the Troubleshooting and Repair Manual, CM870 Electronic Control System, ISM Engines, Bulletin 4021381.Refer to the Troubleshooting and Repair Manual, ISM CM875 Electronic Control System, Bulletin 4021477. Refer to the Troubleshooting and Repair Manual, ISX CM871 and ISM CM876 Electronic Control System, Bulletin 4021560.

Lubricating oil level is above or below specification

Check the oil level. Add or drain oil if necessary. Refer to Procedure 007-025 in Section 7 and
Procedure 007-009 in Section 7. Check the dipstick calibration.

Lubricating oil leak (external)

Inspect the engine for external oil leaks. Tighten the capscrews, pipe plugs, and fittings. Replace gaskets if necessary. Refer to Procedure 018-009 in Section 18 and
Procedure 018-012 in Section V for specifications.

The present lubricating oil drain interval was missed or exceeded based on duty cycle, or oil and filter combination

Change the oil and filters. Refer to Procedure 007-013 in Section 7 and Procedure 007-037 in Section 7. Use INSITE electronic service tool to verify the average kilometers per liter (km/liter) [miles per gallon (mpg)]. Refer to Procedure 102-002 in Section 2 in the Operation and Maintenance Manual, ISM and ISMe Engines, Bulletin 3666319.

Lubricating oil does not meet specifications for operating conditions

If an inspection or customer interview identifies incorrect oil type/grade being used; change the oil and filters. Refer to Procedure 007-013 in Section 7 and Procedure 007-037 in Section 7. Refer to Cummins® Engine Oil Recommendations, Bulletin 3810340. or use the following procedure in the Operation and Maintenance Manual, ISM and ISMe engines, Bulletin 3666319. Refer to Procedure 018-003 in Section V as needed.

Lubricating oil is visually contaminated with coolant, fuel, or sludge

Refer to the Lubricating Oil Contaminated symptom tree, if an inspection reveals contamination.

Oil pressure is critically low, or non-existent

Proceed forward in this tree to the step that directs removing the oil pan and checking the suction tube. (Do not perform steps in the symptom tree requiring engine operation if oil pressure is non-existent).

Accessory oil flow is excessive

Identify oil flow ratings of installed accessories (Spinner filter, alternator, etc.) Compare total flow to Cummins® recommendations. Refer to the Engine Specification data sheet. Contact a Cummins® Authorized Repair Location for technical assistance, if necessary.

Engine angularity during operation exceeds specification

Refer to the Engine Specification data sheet. Contact a Cummins® Authorized Repair Location for technical assistance, if necessary.

Lubricating oil pressure sensor or gauge is malfunctioning, or is not in the correct location

Verify oil pressure at the main oil rifle using a known good gauge. Check the oil pressure switch or gauge for correct operation and location. Refer to Procedure 007-028 in Section 7.

Lubricating oil temperature is above specification

Refer to the Lubricating Oil Temperature Above Specification symptom tree.

Lubricating oil filter is plugged

Establish a baseline oil pressure at operating temperature, and steady RPM. Change the oil and filter. Refer to Procedure 007-013 in Section 7 and Procedure 007-037 in Section 7.

Lubricating oil filter is plugged

Inspect the used oil filter removed in the previous step. Refer to Procedure 007-083 in Section 7. Verify oil pressure improvement with a new oil filter and oil under baseline conditions.

Internal oil leak (engine brake)

Check the engine brake hose connections, o-rings, engine brake housing, and pipe plugs for oil leaks. Refer to Procedure 020-024 in Section 20.

Lubricating oil suction or transfer tube is loose or broken, or the gasket or o-rings are leaking

Remove and inspect the oil pan or suction tube. Refer to Procedure 007-025 in Section 7.

Main oil pressure regulator is malfunctioningProcedure 007-029 in Section 7

Check the main oil pressure regulator assembly. Refer to Procedure 007-029 in Section 7.

Lubricating oil high-pressure relief valve is malfunctioning

Remove and inspect the high-pressure relief valve. Refer to Procedure 007-021 in Section 7.

Piston cooling nozzles are damaged or are not installed correctly

Check the piston cooling nozzles for damage and correct installation. Refer to Procedure 001-046 in Section 1.

Lubricating oil pump is malfunctioning or the o-rings are damaged

Inspect the lubricating oil pump mounting capscrews for correct use of sealant. Inspect the lube pump and o-rings. Refer to Procedure 007-031 in Section 7.

Lubricating oil is contaminated or outside of viscosity specifications, with no clear visual indication

Review the customer’s oil analysis records, if available. If no recent oil analysis results are available, perform an oil analysis to identify potential contamination. See the used oil contamination guidelines. Refer to the Cummins® Engine Oil and Oil Analysis Recommendations Bulletin 3810340.

Lubricating oil cooler is plugged

Check the oil cooler. Refer to Procedure 007-003 in Section 7.

Lubricating oil filter head is damaged

Check the lubricating oil filter head for damage. Inspect the filter bypass plunger, spring and bore. Inspect the oil thermostat and bore. Refer to Procedure 007-015 in Section 7.

Internal engine damage or internal lubricating oil leak

Request additional Cummins Inc. technical assistance before continuing to the next step. Contact a Cummins® Authorized Repair Location..

Internal engine damage (bearing clearance excessive)

Check the main bearings for excessive clearance or wear. Refer to Procedure 001-006 in Section 1.

Internal lubricating oil leak between the gear housing and the cylinder block

Check for excessive internal oil leakage between the cylinder block and gear housing.

Oil rifle cup plug, located behind flywheel housing, is missing or leaking oil

Inspect behind the flywheel housing for a missing or leaking oil rifle cup plug.