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Monday, October 22, 2012

CRANKCASE OIL ANALYSIS RESULT

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Viscosity-Increases due to thermal degradation or hfo contamination, reduces with diesel oil contamination, corrective action needed if it increases by 25% from new oil.
Water content-Corrective action required at 1%
Insoluble Sediments-basically the result of wear and oxidation, corrective action at 1% by weight
Ash-a measure of incombustible in the oil sample, corrective action at 0.13% by weight
TAN-Total acid number consists of the strong acids (mainly sulphuric acid) formed in the combustion process and weak acids resulting form oxidation of the lub oil.
SAN-Strong acid number, the oil should be renewed if any is detected
TBN-Total base number indicates the alkaline reserve particularly important for trunk piston engines
Closed flash point-highlights fuel contamination, corrective action if reduces by 30oC from new 

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