Drain the coolant in the following order:
Figure 4.74. Removing the plug from the expansion tank of the cooling system: 1 - cork
- unscrew plug 1 (figure 4.74) expansion tank;
Figure 4.75. Radiator drain plug: 1 - cork
- unscrew plug 1 (figure 4.75) radiator drain hole;
Note: Place a piece of hose over the drain hole to prevent liquid from splashing out of the system.
Figure 4.76. Cooling system plug: 1 - plug
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- unscrew plug 1 (figure 4.76) cooling system drain hole;
Figure 4.77. Cooling system plug: 1 - cork
- unscrew plug 1 (figure 4.77) and drain the coolant from the engine cooling system.
Fill the cooling system and remove air from it in the following order:
- before filling the system with coolant, flush it with clean fresh water;
- check the engine cooling system for leaks;
Figure 4.78. Filling the engine cooling system: 1 - cylinder for filling with coolant
- install cylinder 1 on the filler neck of the expansion tank (figure 4.78) for filling with coolant;
- unscrew all the plugs of the cooling system drain holes;
- slowly begin to pour coolant into the cooling system;
- successively close the drain holes with plugs as the coolant flows through them without air bubbles;
- the coolant filling cylinder must be filled to the 1L mark to ensure proper bleeding of the system;
- start the engine;
- stabilize the crankshaft speed from 1500 to 2000 min⁻¹ until the end of the second cooling cycle (turning on and then off the engine cooling fans), maintaining the filling of the cylinder, creating excess pressure in the system;
- stop the engine;
- remove cylinder 1 (see figure 4.78) for filling with coolant;
- close the cap on the tank as quickly as possible to remove air bubbles;
- if necessary, top up the coolant level to the maximum mark when the engine is cold.