c) Loosen the coolant drain plug.
Loosen the coolant drain plug of the cylinder
block.
Caution : When removing the pressure filler cap while the engine is still hot, cover the cap
with a rag, then turn it slowly to release the internal steam pressure This will pre-
vent a person from scalding with hot steam spouted out from the filler port.
5.3.2. Cleaning of the cooling system inside circuit (by authorized specialist personnel)
When the cooling system circuits are fouled with water scales or sludge particles, the cooling
efficiency will be lowered.
Investigations have shown that in many cases the poor condition of the coolant and /or the cool-
ing system accounts for damage to the water pump mechanical seal, The poor condition of the
cooling system is normally due to use of unsuitable or no anti-freezing agents and corrosion
inhibitor or defect, not early enough replaced covers for filler neck and working valves.
If twice in a short time the water pump of an engine develops leases or the coolant is heavily con-
taminated (dull, brown, mechanically contaminated, gray or black signs of a leakage on the water
pump casing) clean the cooling system prior to removing that water pump as follows.
a) Drain coolant.
b) Remove thermostats, so that the whole cooling system is immediately flown through when
cleaned.
c) Fill the cooling system with a mixture of potable water and 1.5% by volume of cleaner.
(Henkel P3T5175)
d) Warm up engine under load. After a temperature of 60
û
C is reached, run engine for a further
15 minutes.
e) Drain cleaning fluid.
f) Repeat steps c) and d).
g) Flush cooling system.
h) Replace drain plug by drain plug with a bore of 8mm diameter.
i) Fill cooling system with hot water.
j) Run engine at idle for 30 minutes. At the same time continuously replenish the water leak-
ing from the bore in drain plug by adding fresh water.
Periodically clean the circuit interior with a cleaner.
- Cooling system cleaning interval: Every 1,200 hours.
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