DV11
Operation and Maintenance
175
Commissioning and Operation
Printed in Mar. 2005 PS-MMA0608-E1A
4.7.2. Cleaning of the cooling inside system circuit
When the cooling system circuits are fouled with water scales or sludge particles, the
cooling efficiency will be lowered. When the cooling system circuits are clogged, the
water pump mechanical seal is damaged.
The poor condition of the cooling system is normally due to use of unsuitable or no
anti-freezing agents and corrosion inhibitor or defect.
If twice in a short time (within 6 months) 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°C 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.
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