Service Manual for WD10 Diesel Engine 223 Check Fuel Level Check fuel level gauge on instrument panel and add fuel timely. 224 Check “Three Leakages” Check engine appearance for water leakage, air leakage and oil leakage. 225 Check Fan Visually check whether fan blades are damaged, and whether connecting bolts are tightened. Fig. 2-5 Check fan 226 Check Belt The belt is automatically taken-up by a tightening wheel, user can check the tension of the belt by pressing it with hand. 227 Check Whether Exhaust Gas Color is Normal Normal exhaust gas color is light gray. Find out the cause and eliminate it if the color is abnormal. Fig. 2-6 Check exhaust gas 14