OPM 320 en-GB
41
©
Scania CV AB 2019, Sweden
Cooling system
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
dishwasher detergent for household dish-
washers that does not foam. Concentration
1%.
4.
Run the engine until it has reached operating
temperature for approximately 20-30 min-
utes. 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 dishwashing
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 it is necessary to carry out another
full cleaning or whether only rinsing or
cleaning of the expansion tank will suffice.
Internal cleaning: Removing deposits 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.
1.
Run the engine until it has reached operating
temperature and then drain the cooling sys-
tem following the previous description.
2.
Remove the thermostat.
3.
Fill the cooling system with clean, hot water
mixed with radiator detergent which is based
on sulphamic acid and contains dispersing
agents. Follow the manufacturer's instruc-
tions for the concentration and cleaning peri-
od.
4.
Run the engine for the specified time. Re-
member 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.
Drain the water from the cooling system.
8.
Reinstall the thermostat.
9.
Fill the cooling system with new coolant as
described in the next section.
External cleaning: Cleaning the radia-
tor and charge air cooler
1.
Check that neither the radiator nor the charge
air cooler are clogged on the air side and that
the cooling fins are not damaged.
2.
Carefully scrape away any deposits from the
radiator cooling fins. Use a paraffin-based
engine cleaner if necessary.
3.
Carefully straighten bent cooling fins using a
steel brush or the like.
