Yaroslavl Engine Plant YMZ-536, Operation Manual

Page: 134 / 168

134
COOLING SYSTEM MAINTENANCE
Proper operation of the cooling system is critical for the engine
efficiency, reliability, service life and other performance
characteristics.
The cooling system maintenance procedure includes the
following:
1. Replace the cooling liquid every three years of the vehicle
operation.
To drain the cooling liquid, use the tap or the drain plug
located on the cooling liquid feed line from the vehicle radiator to the
engine water pump (see Vehicle Operation Manual).
2. Before filling in fresh cooling liquid, wash the cooling
system with clean water by means of a special washing gun; if the gun
is not available, wash the system with a high-pressure jet stream of
clean water (preferably pulsating).
3. Fill the system with cooling liquid.
4. Start the engine and let it run for 1 or 2 minutes at min. idle
speed in order to remove airlocks. Stop the engine and check the
cooling liquid level. If the level is below normal and there are no
traces of leakage, add more cooling liquid.
To ensure normal engine operation, pay attention to a change
in the color of the cooling liquid. If the liquid becomes brown, it
means that it is aggressive to the structural materials of the engine
parts. In this case the cooling liquid must be changed. Prior to filling
in a new coolant, the cooling system must be thoughtfully washed.
ATTENTION!
1.
FOR THE ENGINE COOLING SYSTEM USE ONLY THE
COOLANTS SPECIFIED IN THE “
CONSUMABLES”
SECTION OF
THIS MANUAL
2. POUR IN THE COOLING LIQUID THROUGH A FUNNEL WITH A
SCREEN USING CLEAN CONTAINER.
3. BEFORE ADDING THE COOLING LIQUID, STOP THE ENGINE
AND LET IT COOL DOWN TO BELOW 40

С . BE CAREFUL WHEN
OPENING THE CAP OF THE FILLER NECK AS THERE IS A RISK OF
HOT WATER AND STEAM BLOWOUT.