2003-10:1 © Scania Industrial & Marine Engines 33
6. Every 2400 hours:
CHECKING THE COOLANT
Coolant should be checked as follows:
a) Check the appearance of the coolant.
b) Coolant with glycol only: check the glycol content.
c) Coolant with Scania Corrosion Inhibitor only:
Check the anti-corrosive content.
The composition of the coolant is described in more detail under
"Starting and running"
a)
Checking the appearance of the coolant
- Fill a container with a little coolant and check that it is clean and clear.
- If the coolant is contaminated or cloudy, consider changing it.
- Water added to the coolant should be clean and free from dirt of any
kind.
- Use drinking water with a pH of 6 - 9.
b)
Checking the glycol content
If there is a danger of freezing, use only glycol as an anti-corrosive in the
coolant.
- Cooling systems with glycol should contain at least 30% glycol by
volume to provide acceptable protection against corrosion.
- 30% glycol by volume provides protection against freezing to -16°C. If
additional protection against freezing is required, see the table on the
next page to help you calculate how much glycol you need.
We recommend only nitrite-free anti-freeze glycol with the following
supplier designations:
BASF G48 or BASF D542
- Always top up the anti-freeze if its glycol content drops below 30% by
volume. A glycol content above 60% by volume will not provide greater
protection against freezing.
- The table shows the temperature at which ice starts to form. The engine
will freeze and break at appreciably lower temperatures, see diagram.
- Ice forming in the coolant often causes malfunctioning without any risk
of damage. The engine should not be subjected to heavy loads when ice
starts to form.
Note: The coolant should be changed when the cooling system is
cleaned: every 4800 hours or at least every 5th year.
Important! If a coolant filter is used in the cooling system it must not
contain an inhibitor.
Coolant composition:
If there is a danger of freezing:
minimum
30% glycol by volume
maximum
60% glycol by volume
If there is no danger of freezing:
7-12% by volume
Scania Corrosion Inhibitor
The coolant should be ready
mixed when it is poured into the
cooling system.
Never top up with only water or
only glycol.
Ethylene glycol is
corrosion inhibitor.
Avoid skin contact
with glycol.
The recommended glycol must
not be mixed with glycol having
nitrite-based anti-corrosive.
Risk for build up of sludge and
reduced cooling capacity.
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