Cleaning cooling system
55
Cleaning the outside of the radiator
Extreme dirt deposits can clog the honeycombs so that the remaining surface no longer ensures sufficient
cooling. In such cases, the insects, dust etc. should be removed from the honeycomb system of the radia-
tor block and the radiator itself then cleaned with the cleansing agent HENKEL P3-begesol. This cleansing
agent is available from MAN in 10-kg cans under Part No. 09.21002-0164.
Procedure:
D Mix P3-begesol with water, ratio 1:1
D Using a spray gun, spray the mixture in as straight a jet as possible directly into the radiator fins
D Let the mixture work for 5 minutes
D Hose down the radiator with a straight jet of tap water directly from the front. In cases of stubborn dirt
deposits remove the radiator and hose it down directly from behind. Do not use high-pressure cleaners
(steam sprayers may be used)
Henkel P3-begesol contains no toxic or corrosive substances and, if handled properly, may be used without
hesitation.
Cleaning the inside of the cooling system
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 nor-
mally 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 leakes or the coolant is heavily contaminated
(dull, brown, mechanically contaminated, grey or black signs of a leakage on the water pump casing, after
the defect on the oil cooler) clean the cooling system prior to removing that water pump as follows:
a) Drain coolant
b) Open thermostats positively (use short-circuit inserts), so that the entire coolant circuit is flushed in the
cleaning operation
c) Fill coolant circuit with a mixture of hot water (min. 50°C) and Henkel P 3 neutrasel 5265 detergent
(1.5% by volume) (-5266, -5225, Kluthe Hakopur 316), refer to Publication ”Fuels, Lubricants ...”
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. To this effect
h) Replace drain plug by drain plug with a bore of 8 mm dia
i) Fill cooling system with hot water
k) 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
Repair water pump only now. Thereafter, fill the cooling system with approved cooling fluid. See Publication
“Fuels, Lubricants ...”.
Note:
Only sediments and suspended particles can be removed by this cleaning method. If corrosion
and lime deposits are found, proceed according to the following section:
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