There are various seals on the engine of a Daihatsu Hijet. The Cam Seal mounts on the front of the cam shaft. The Valve Stem seals are mounted on the valve guide and stop oil from running down the valves and into the combustion chamber, The front and rear crank seal stop oil from escaping the crank case and out of the engine. The differential seals keep the gear oil inside the differential. The Pinion seal and axle seal keep the oil inside the rear end assembly of the Daihatsu Hijet mini truck. There are seals on the front drive train that keep dust and dirt out of the front wheel bearings.