154159-0100 ZEXEL 9 421 617 042 BOSCH CAP NUT 9421617042 1541590100 9813251120

Removal of Cooling System
Disassembly, Inspection and Reassembly Of Cooling System
Water Pump
Inspection of Water Pump
Inspection of impeller and shaft rotation conditionIf the inspection of the impeller and shaft finds abnormal noise or rough rotation, replace the assembly.Thermostat
Disassembly of Thermostat
Inspection of Thermostat
Inspection of thermostatTo test the thermostat operation, immerse the thermostat in a container filled with water, and heat the water while measuring the water temperature. Record the temperature at which the valve starts to open and the temperature at which the valve lift becomes 8 mm [0.3 in.] or more. (a) Stir the water in the container to ensure uniform temperature distribution.(b) When installing the thermostat, be sure to check the valve opening temperature indication stamped on the upper face of the thermostat mounting flange.Overheating Warming Unit (Thermo Switch)
Inspection of Overheating Warming Unit
Overheating warming unit Immerse the temperature sensor in oil, and measure the resistance while increasing the oil temperature. If the temperature measurement exceeds the standard value significantly, replace the thermo switch.
Since the inspection requires heating of oil to high temperatures, be careful not to get burns or start a fire.
Installation of Cooling System
Installation of Cooling System