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N14 Base Engine Troubleshooting and Repair Manual – 007-083   Lubricating Oil and Filter Analysis

Table of Contents

Failure Analysis Inspection

Failure Analysis Inspection

 TOC

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

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.

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 CAUTION 

Carefully cut open the upper section of the combination filter. The filter element spring is under compression and can cause personal injury.

Use the tube cutter, Part Number 3376579, or equivalent, to open the upper section of the combination filter.

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

Metal Probable Source
Copper Bearings and Bushings
Chromium Piston Rings
Iron Cylinder Liners
Lead Bearing Overlay Material
Aluminum Piston Wear or Scuffing
 
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Last Modified:  15-Mar-2005
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