Water Content; Flash Point; Insolubles - Mitsubishi S16R2-PTAW Operation & Maintenance Manual

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Chapter 5 ENGINE OIL

Water Content

Water in oil promotes corrosion/wear, and decreases

lubricity in sliding parts.

The flash point is lowered by contamination with fuels.

Flash point is used to check the dilution of fuel. The

dilution of fuel reduces oil film, and causes insufficient

lubrication that will cause friction or wear of engine

parts.

Insoluble

Insoluble include acid products of engine oil, imperfect

combustion products, sludge or soot, metal abrasive

particles and dust. Insoluble is an indication of degra-

dation/contamination of oil.

Dispersant detergent, which is an additive in engine

oil, absorbs sludge particles, and disperses them as

fine particles in oil. Total insoluble density and remain-

ing dispersibility can be obtained by measuring insolu-

ble and coagulated insoluble (chemical specialties

which stop action of disperse detergent and collect the

sludge dispersed in oil) to understand engine oil con-

tamination level, and thereby, piston ring seizure or

premature wear can be prevented before it occurs.

5-6

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