NOTE: If the piston cooling rifle pressure is below specifi-
cations and the oil filter outlet pressure is within, or exceeds,
specifications, check for broken piston cooling nozzles, a
stuck pressure regulator plunger, or for internal engine
damage.
Lubricating Oil and Filter Analysis
(2-02)
Lubricating Oil
An analysis of used oil can help diagnose internal engine
damage and determine if it was caused by one of the
following:
• Intake air filter malfunction.
• Coolant leaks.
• Oil diluted with fuel.
• Metal particles causing wear.
For additional oil analysis information, refer to Cummins
Engine Oil Recommendations, Bulletin No. 3810340.
NOTE: Do not disassemble an engine for repair based only
on the results of an oil analysis. The oil filter must also be
inspected. If the oil filter shows evidence of internal damage,
find the source of the problem and repair the damage. Refer
to the appropriate Procedure(s) based on the following oil
filter inspection.
Lubricating Oil Filter
Caution: Carefully cut the upper section of the combo
filter open. The filter element spring is under compres-
sion and can cause personal injury.
Use the tube cutter, Part No. 3376579, to open the upper
section of the combo filter.
Lubricating Oil and Filter Analysis (2-02) Section 2 - Lubricating System
N14Page 2-18
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