24. SERVICE PROCEDURE 1. Stop the engine and tighten valve 1 of the corrosion resistor. 2. Turn radiator cap 2 slowly and remove it. 3. Set a container to catch the coolant, open drain valve 3 at the bottom of the radiator and drain valve 4 at the bottom of oil cooler and drain plugs 5 at the both sides of cylinder block, and drain off the cooling water. 4. After draining, close up drain valve 3 , 4 and plugs 5 and pour in clean water (ex. city water) up to the vicinity of the water filler. 5. When the water reaches the vicinity of the water filler, put the engine at low idling, open drain valve 3 , 4 and plugs 5 , then pass water through the cooling system for 10 minutes.
When doing this, keep the radiator filled up to the filler with water. When filling with water, be careful to check that the hose supplying the water does not come out of the water filler port at the radiator cap. 6 After washing the cooling system, stop the engine. Drain water and close drain valve 3 , 4 and plugs 5 . 7. After draining the water, flush the system with a flushing agent. For details of the flushing method, see the instructions on the flushing agent. 8. After flushing, open drain valve 3 , 4 and drain plugs 5 , completely drain all the water, then close the drain valve and drain plug, and fill with city water up to near the filler port. 9.
When the tank is filled to near the water filler port, open drain valve 3 , 4 and drain plugs 5 , start the engine, run at low idling, and continue the flushing operation until clean water comes out. While flushing the radiator, adjust the incoming flow of water to match the drain flow so that the radiator is always kept full during the flushing operation. Be sure that the water supply hose does not slip out of the radiator water filler when flushing. 10. When clean water comes out, stop the engine and close drain valve 3 , 4 and drain plug 5 . 11. Replace the corrosion resistor and open valve 1 . For details on the corrosion resistor replacement method, see “24.6 EVERY 1000 HOURS SERVICE”.
12. Add city water until the water overflows from the water filler port. 13. To remove the air in the cooling water, run for five minutes at low idling, then for another five minutes at high idling. (When doing this, leave the radiator cap off.) 3-25