Scania DC09 - Internal Cleaning: Deposit Removal and Filling Coolant

OPM 100 en-GB 78
© Scania CV AB 2023, Sweden
Cooling system
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 if possible and then drain the
cooling system following the previous de-
scription.
2. Remove the thermostats.
3. Fill the cooling system with clean hot water
mixed with a radiator detergent that is based
on sulfamic 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. Refit the thermostats.
9. Fill the cooling system with new coolant as
described in the next section.
Filling coolant
These procedures apply when the cooling system
has been drained and needs to be filled with a
large amount of coolant.
WARNING!
Use protective gloves as coolant can cause irrita-
tion if it comes in contact with the skin. Hot cool-
ant can also cause scalding.
IMPORTANT!
Mix the coolant as specified in the section head-
ed Coolant
.
It is not permissible to top up large amounts of
coolant via the expansion tank. Filling via the ex-
pansion tank leads to air pockets in the cooling
system which can lead to e.g. damage to the cool-
ant pump shaft seal. If a large amount of coolant
needs to be added, follow the instructions in the
section Filling coolant
.
Never fill a hot engine with a large amount of
cold coolant. There is a high risk of cracks form-
ing in the cylinder block and cylinder heads
Do not start the engine until the correct coolant
level has been obtained. If the engine is started
with engine coolant level low, it can damage the
coolant pump shaft seal, which leads to coolant
leakage.