Nanni N16.900 CR3, Operator'S Manual

Page: 23 / 119

23
CHECKING THE 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 pressure before removing the cap.
Use protective gloves as coolant can cause irritation 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 expansion tank
leads to air locks in the cooling system 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
instructions in the section Filling coolant.
Only pour pre-mixed coolant into the cooling system.
The following instructions apply to Scania expansion
tanks. For other types of expansion tanks, follow the
manufacturer’s instructions.
1. Check the coolant level through the sight glass on the
expansion tank.
2. Top up with coolant as necessary.
S03 FLUIDS
CHECKING THE COOLANT’S ANTIFREEZE
& CORROSION PROTECTION
Specific tool
Description Illustration
Refractometer
WARNING !
Avoid skin contact with coolant as this may cause irri-
tation to the skin. Wear protective goggles and gloves
when handling coolant.
IMPORTANT !
Use only pure fresh water that is free from particles,
sludge and other impurities.
1. Pour a small amount of coolant into a container 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 inhibitor con-
tent with the refractometer.
The following rules apply to ethylene glycol-based cool-
ant:
• 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 pro-
tect against frost.
• If ice forms in the coolant, there are disruptions ini-
tially, but there is no immediate risk of damage. The
engine should not be subjected to heavy loads when
ice starts to form.