Cleaning Of The Cooling Inside System Circuit - Daewoo DE12T Manual

2.7.3. 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 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
contaminated (dull, brown, mechanically contaminated, grey 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 °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) 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.
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TECHNICAL INFORMATION