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(3) Check the unit seals installed in the impeller and water pump case for damage and wear. If defects are evident, or when water leaks during operation, replace the unit seals with new ones. Whenever the unit seal is removed, it must be replaced with a new one. (4) Using a gear puller or press, remove the ball bearings. Do not remove the ball bearing except for replacement. (5) When the impeller and flange are removed from the water pump shaft, it may result in insufficient interference. If the interference is below the specification even reassembly is two times or less they must be replaced with new ones.Reassembly
5.3 Thermostat
Removal and installation
Do not remove the thermostat case and front hanger unless they cause water leak or other defects.Inspection
Agitate water in the container with the stirrer to obtain uniform temperature. For the inspection, use the following procedures. (1) Slowly heat water to the thermostat valve opening temperature. Keep this condition for about five minutes and make sure that the valve is open.(2) Raise the water temperature up to 90°C. Keep the condition for five minutes and measure the lift of pellet.(3) Lower temperature down to 65°C or below and ensure that the valve is fully closed. If the thermostat is found defective in any of the above items, replace it with a new one. Support the thermostat so that the heat source will not directly heat the thermostat.5.4 Radiator
Inspection (1) Using a copper wire or similar device, remove dirt, mud, and bugs from the front of radiator core with care to prevent damage to tubings. (2) Connect a hose to one of the radiator ports, cap the other port, and immerse the radiator into water. Using a radiator cap tester, force the compressed air under the specified inspection pressure from the hose end to check for leaks.If there is a leak, resolder the point of leakage or replace the radiator.(3) Inspection of Radiator Cap Check the spring tension and sealing condition of the pressure valve and vent valve. If defective, replace. Check the pressure valve opening pressure, using a radiator cap tester.5.5 Inspection and Adjustment of V-belt Tension
Adjust the belt tension to obtain the specified belt deflection when the center of each belt is pressed with a force of approximately 98 N (10 kgf). 1. A slack belt can be a cause of overheating and undercharge.2. An excessively tight belt may result in damaged bearings and belts.3. When paired belts are to be replaced, be sure to replace both.5.6 Cleaning of Cooling System
If the radiator is used for a long time, rust, scale, mud, etc. are deposited inside, resulting in overheat. Clean the cooling system with city water by using the following procedures.The city water to be used should have the following properties.Required properties of city water 1. Use a cleaning solution if the radiator is seriously obstructed or coolant is seriously contaminated.2. When the cooling system is cleaned or washed with water, make sure that the coolant temperature is