Cummins ISX11.9 CM2250 – Service Manual 007-083 Lubricating Oil and Filter Analysis

A used oil analysis can help diagnose internal damage and determine the cause, such as:

Intake air filter malfunction
Coolant leaks
Oil diluted with fuel
Metal particles causing wear.

For additional oil analysis information, refer to Cummins® Engine Oil and Oil Analysis Recommendations, Bulletin 3810340.

NOTE: Do not disassemble an engine for repair based solely on the results of an oil analysis. Inspect the oil filters. If the oil filter shows evidence of internal damage, find the source of the problem, and repair the damage. See the appropriate procedure(s) based on the following oil filter inspection.

SMALL | MEDIUM | LARGE

WARNING

Restrain the full flow lubricating oil filter, and carefully cut the filter (upper section of combination filter) open. The filter element spring is under compression and can cause personal injury.

SMALL | MEDIUM | LARGE

Use the filter cutter, Part Number 3376579, to open the full-flow oil filter (upper section of the bypass filter).

Inspect the filter element for evidence of moisture or metal particles.

Metal	Possible Source
Copper	Bearings and Bushings, Lube Pump Bushings, Upper Rod Bushing
Chromium	Piston Rings
Iron	Cylinder Liners, Gears
Lead	Bearing Overlay Material, Lube Pump Bushings, Upper Rod Bushing
Aluminum	Bearing Overlay Material, Lower Rod Bearing, Main Bearings, Camshaft Bushings, Crankshaft Thrust Bearings, Front and Rear Idler Gear Thrust Bearings, Camshaft Thrust Bearings