GATE-SHIFT 9D1106 - Caterpillar

Table 2
Common Chemical Wear Factors    
Item    No Action Required    Monitor    Action Required    
Oxidation     ≤ 23 UFM     24-33 UFM     ≥ 34 UFM    
Sulfation     ≤ 27 UFM     28-33 UFM     ≥ 34 UFM    
Viscosity     < 2 cSt     2 cSt     ≥ 3 cSt    Table 2 lists factors related to the proper chemistry of diesel engine oil and certain guidelines for monitoring those factors.Soot is a product of unburned fuel and is produced by all diesel engines. Soot is an abrasive that becomes more damaging to engine components if soot particles are allowed to agglomerate to form larger particles. All diesel engine oils contain dispersants to keep soot particles from sticking together. When engine oil is contaminated with soot, abrasive mechanical wear accelerates. Soot tends to be produced more readily in engines operating at high altitudes and/or having lower than optimal boost pressure. Soot is one of the reasons that recommended oil change intervals for products operating at high altitudes are reduced relative to the oil change intervals of similar products operating at low altitudes.
Illustration 10 g03403376
Oil deterioration and accumulation of soot often results from broken rings and/or worn liners that allow excessive blowby. Refer to Special Instruction, REHS7857, "Testing for Excessive Cylinder Blowby in 3500 Engines" for guidance in identifying cylinders plagued with broken rings and/or worn liners.Resolve and Proceed
Table 3
Quick Reference Troubleshooting Guide    
Oil Analysis Result    Probable Cause    Notes and References    Recommended Action    
High Pb and high Si, Al     Mechanical Wear : Dirt/Debris Introduced Through Service or Operations     Review service and maintenance practices. Inspection of magnetic plugs and oil filter elements are recommended.     Alter service or maintenance practices to eliminate dirt/debris introduction. Resample oil to confirm wear metal concentrations return to acceptable levels. Consider bearing replacement if the dirt/debris introduction was severe (high concentration, long duration, and so on) and/or if the engine is not close to PCR target.    
High Pb and high Si, Al, Fe, Cr     Mechanical Wear : Dirt Ingestion Through the Air System     Refer to Service Magazine, SEPD0712, "Procedure to Test Air Induction System".     Repair source of dirt ingestion and resample oil to confirm wear metal concentrations return to acceptable levels. Consider bearing replacement if the dirt ingestion was severe (high concentration, long duration, and so on) and/or if the engine is not close to PCR target.    
High Pb and high Cu     Mechanical Wear : Thrust Bearings or Bushings     Bushings, bearings, and thrust washers in rear gear train and air compressors are common sources. Larger particles can often be observed in filter media.     Check filter media and magnetic plugs for presence of larger particles. Replace worn components and resample oil to confirm wear metal concentrations have returned to acceptable levels.    
High Pb Only     Mechanical and/or Chemical Wear : Extended Oil Change Interval, Abnormal Operating Conditions, Out of Specification or End of