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Cavitation – Your Diesel Engine Cooling System’s Worst Nightmare

Cavitation is an issue that has plagued the diesel engine for years. One of the main concerns created by cavitation is the erosion of the metal on the outside surface of cylinder liners.

Tiny air bubbles are formed during normal engine operation and implode at an extremely high temperature and pressure and eat into the wall of the cylinder (see Figure 1). This erosion eventually penetrates the cylinder wall allowing coolant to enter, contaminating the oil or even causing the engine to hydrolock. The liner O-rings are also effected by cavitation as well, and can erode or become brittle and break away.  
    
Supplemental coolant additives (SCA’s), and their concentrations, are important to help minimize this damage. These additives help by coating the surfaces that contact coolant with Nitrites. SCA additives also provide pH control to help fight corrosion, and soften the water to help stop mineral deposits from forming. The proper levels must be maintained in your engines, or it will fail prematurely.

Be sure to remind customers to check the levels of their additive package two times per year and test their coolant for replacement once each year.

–Tech Tip courtesy of Jasper Engines & Transmissions