OPM 260 en-GB
57
©
Scania CV AB 2021, Sweden
Cooling system
Internal cleaning: Removing oil and
grease in the cooling system
Environment
Use a suitable container. Used coolant must be
disposed of as specified in national and interna
-
tional laws and regulations.
Always fit a new thermostat and a new cover to
the expansion tank after cleaning, as the oil in the
cooling system destroys the seals. If the engine is
fitted with a coolant filter, also renew this filter.
It may be necessary to wash it multiple times if
the cooling system is very dirty. One cause of
contamination can be that oil is lying on top of
the coolant and collecting high up in the cooling
system. If several rinses are needed, this is not
necessarily because work has been carried out
incorrectly. Oil residues often need to be rinsed
repeatedly from the expansion tank and the ex
-
ternal heating system to be completely clean.
Repeated washing is more effective and prefera
-
ble to using higher concentrations of detergent
(max. 10%) or cleaning for a longer period (max
30 minutes).
If only a small amount of dirt has collected in the
expansion tank after cleaning, one extra rinse
and clean of the expansion tank only is usually
sufficient. There is no need to clean the whole
cooling system again.
1.
Run the engine until it has reached operating
temperature if possible and then drain the
cooling system following the previous de
-
scription.
2.
Remove the thermostat.
3.
Fill the cooling system with clean hot water
mixed with detergent 2 479 017. Detergent
2 479 017 must make up 5-10% (depending
on the degree of dirt) of the total coolant vol
-
ume.
If detergent 2 479 017 is not available, use a
dishwashing detergent for domestic appli
-
ances that does not foam. Concentration 1%.
4.
Warm up the engine for approximately 20-30
minutes. Remember to switch on the cab
heating system, if one is installed.
5.
Drain the cooling system.
6.
Fill the cooling system with clean, hot water
and run the engine for about 20-30 minutes.
7.
Repeat steps 3-6 if the cooling system is not
clean.
8.
Drain the water from the cooling system.
9.
If necessary, clean the expansion tank by de
-
taching all hoses and rinsing and cleaning
with a degreasing agent and a dish brush.
Alternatively, dismantle the expansion tank
and clean it with water with 10% of detergent
2 479 017. Fill the expansion tank with the
mixture, shake it and drain it. Renew the cov
-
er of the expansion tank.
10.
Fit a new thermostat.
11.
Fill the cooling system with new coolant as
described in the next section.
12.
Check again whether further dirt or oil has
collected in the expansion tank. Decide
whether it is necessary to carry out another
full cleaning or whether only rinsing or
cleaning of the expansion tank will suffice.
