Commissioning and Operation
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c) Loosen the coolant drain plug.
Loosen the coolant drain plug of the
cylinder block and oil cooler.
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
prevent a person from scalding with hot
steam spouted out from the filler port.
4.7.2. Cleaning of the cooling inside system circuit
(by authorized specialist personnel)
When the cooling system circuit 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 cooling
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
contaminated (dull, brown, mechanically contaminated, gray or black sings 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°ýC is reached, run engine for a further 15
minutes.
e) Drain cleaning fluid.
f) Repeat steps c) and d).
g) Fill cooling system with hot water.
h) Run engine at idle for 30 minutes. At the same time continuously replenish the water leaking from
the bore in drain plug by adding fresh water.
CAUTION:
Periodically clean the circuit interior with a cleaner.
ED4OM042
Drain plug
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