PENGARUH PENGGUNAAN AIR PDAM DAN BERBAGAI VARIAN CAIRAN PENDINGIN (COOLANT) TERHADAP POTENSI TERJADINYA OVERHEATING PADA MESIN (STUDI KASUS MITSUBISHI L300)

The cooling system on the engine works as an engine protector by absorbing
heat. Engine heat is generated from the combustion of fuel in the cylinders. The
heat is something that is deliberately created to produce power, but if left unchecked
it will cause excessive heat (overheating effect). Excessive heat is the cause of
changes in the mechanical properties and shape of engine components.
This research was conducted on the basis of the widespread use of tap water
on radiators by owners of Compulsory Test Motor Vehicles in the Surakarta City
area. The study was conducted on Mitsubishi Colt Diesel L300 vehicles with
methods of testing the effectiveness of radiator performance and engine
temperature measurements at engine speed variations of 2.500 and 3.100 rpm. The
results showed that of several variants of coolant sampled, tap water has the worst
heat exchange power compared to other cooling media samples. This is evidenced
by the temperature of the liquid entering the radiator (Th1) produced at 2.500 rpm
of water of 90°C, and 96.4°C at 3.100 rpm, thus impacting the engine temperature
produced by 92.1°C at 2.500 rpm and 98.4°C at 3.100 rpm. While the most effective
type of coolant used is the Prestie Radiator Coolant brand with Th1 at 2.500 rpm of
74.6°C and at 3.100 rpm of 78.2°C, thus impacting the working temperature of the
engine produced at 2.500 rpm of 84.7°C and 88.8°C at 3.100 rpm.
Keywords: Overheating, temperature, water, cooling medium, rpm, engine