The piston ring on the 4-stroke engine prevents air leakage, fuel, and combustion gases through the gap between the piston and the cylinder wall into the crank. This happens as long as the piston moves to suction and discard.
Well, because of this vital function, if until damage occurs or the piston ring has begun to wear out, will make the performance of the car or motor is reduced. Not only that, the machine will ngebul or remove white smoke, the use of oil so wasteful and low compression pressure.
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