COOLING AND LUBRICATION SYSTEM 7-3 COOLING CIRCUIT RESERVOIR THERMOSTAT ENGINE COOLANT TANK CYLINDER HEAD TEMPERATURE SENSOR CYLINDER RADIATOR WATER PUMP COOLING CIRCUIT INSPECTION Before removing the radiator and draining the engine coolant, E inspect the cooling circuit for tightness. • Remove the under cowlings. (8-5) L • Remove the radiator cap 1 and connect the tester 2 to the filler. P  M Do not remove the radiator cap when the engine is hot. A S • Give a pressure of about 120 kPa (1.2 kgf/cm², 17 psi) and see if the system holds this pressure for 10 seconds. • If the pressure should fall during this 10-second interval, it means that there is a leaking point in the system. In such a case, inspect the entire system and replace the leaking com- ponent or part.  When removing the radiator cap tester, put a rag on the filler to prevent spouting of engine coolant.  Do not allow the pressure to exceed the radiator cap release pressure, or the radiator can be damaged.