... gasoline engines, diesel engines, CNG Engines, generators.2) Japanese, Korean, European, American, etc. engines.3) car, passenger car, truck, tractor, ... construction machinery, agricultural machinery, motorcycle, industries and marine, etc.4) make of vehicle/engine: ISUZU, HINO, NISSAN, TOYOTA, ... , CHEVROLET, HUMMER, DODGE, JEEP, CUMMINS, CATERPLILLAR, LADA, SCANIA, ETC. VALVE TAPPET