Contamination and Sludge Formation

Contamination and Sludge Formation Points : Contamination and Sludge Formation, Lubrication System Problem, Problems in internal combustion engines ic engine High temperature tends to hum the oil to carbon and to make the oil combine with air and become oxidized, so that it leaves gummy deposits on valve steams and piston rings and make them stick in their guides and grooves. High working pressure raises the temperature of the oil and tends to produce the above effects. If oil is used for too long, it becomes full of dirt, sludge and acids, which attack bright metal surfaces instead of protecting them against corrosion.

The formation of sludge in an engine is largely caused by condensation of moisture in the crankcase. At the same lime; blow of acid gasses past the piston rings causes correction, contributes to gum deposits and also carries carbon particles and other foreign matter into the lubricating oil. Various methods of providing positive crankcase ventilation causes of contamination are:
1. Blow-by
2. Rings worn excessive piston or cylinder wear
3. Water entering oil
4. Crankcase condensation due to low engine operating temperature.