All internal combustion engines produce heat as a byproduct of combustion and
friction. This heat can reach temperatures up to 1925°C (3500°F) and can have
catastrophic effects on engine components. Pistons, valves and cylinder heads
must be cooled to reduce the risk of detonation. Cylinder temperatures need to be
controlled so lubricating oil can maintain a protective film on the cylinder surfaces
and the lubricating oil should be cooled to ensure its integrity.
In addition to overheating, overcooling can have negative effects on the engine.
Overcooling can reduce engine performance and shorten the engine’s service life.
Cooling systems are used to manage engine heat. Cooling systems must be properly
designed, operated and maintained for proper engine operation and service life. This
guide describes and explains methods of managing engine heat for various engine