Engine repair is a complex process of restoring worn out units and power train parts, which includes many operations. The repair characteristics depend on the type and class of the engine. Engine repair is carried out in case of wear of parts by more than 80%; in case of mechanical damage to the power train; damage caused by incorrect setup or maintenance. There are several types of engine repairs: in-line repair - replacement of parts that have a resource lower than the main power train; unscheduled repairs - elimination of unexpected malfunctions of the power train; scheduled or major repairs, carried out according to the mileage of the car.