OPM 320 en-GB
38
©
Scania CV AB 2019, Sweden
Cooling system
Checking coolant level
WARNING!
Do not open the coolant filler cap in the expan-
sion tank if the engine is hot. Hot coolant and
steam may spray out and cause burns. If the cap
has to be opened do it slowly to release the pres-
sure before removing the cap.
Use protective gloves as coolant can cause irrita-
tion if it comes in contact with the skin.
IMPORTANT!
It is not permissible to top up large amounts of
coolant via the expansion tank. Filling via the ex-
pansion tank leads to air locks in the cooling sys-
tem which can lead to e.g. cavitation damage to
the coolant pump shaft seal. If a large amount of
coolant needs to be added, follow the instruc-
tions in the section
Only pour pre-mixed coolant into the cooling
system.
The following instructions apply to Scania ex-
pansion tanks. For other types of expansion
tanks, follow the manufacturer's instructions.
1.
Open the expansion tank cap and check the
coolant level.
– The right coolant level on a cold engine is
even with the lower edge of the filler neck.
– The right coolant level on a hot engine is
approximately 25 mm (1 in) over the low-
er edge of the filler neck.
2.
Top up with coolant as necessary.
Checking the coolant's anti-
freeze and corrosion protec-
tion
Tools
WARNING!
Avoid skin contact with coolant as this may
cause irritation to the skin. Wear protective gog-
gles and gloves when handling coolant.
IMPORTANT!
Use only pure fresh water that is free of particles,
sludge and other impurities.
1.
Pour a small amount of coolant into a con-
tainer and check that the coolant is pure and
clear.
2.
Change the coolant if it is contaminated or
cloudy.
3.
Measure the antifreeze and corrosion inhibi-
tor content with the refractometer.
The following rules apply to ethylene glycol-
based coolant:
• The antifreeze and corrosion inhibitor content
must be minimum 35 percent by volume for
corrosion protection to be sufficient.
• An antifreeze and corrosion inhibitor content
greater than 55 percent by volume impairs the
ability to protect against frost.
• If ice forms in the coolant, there are disrup-
tions initially, but there is no immediate risk
of damage. The engine should not be subject-
ed to heavy loads if ice starts to form.
Designation
Illustration
Refractometer
305 523
1380
08
