5.3.2. Cleaning of the cooling system inside 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 cor-
rosion 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 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
˚
C is reached, run engine for a fur-
ther 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.
- 36 -
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