FPT NEF67TM7 - ENGINE COOLANT CHANGE PROCEDURE; Coolant Draining, Refilling & Air Bleeding

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Drainage/suction of water, condensation and
impurities from the fuel tank/s
Perform the drainage/suction of water, condensation and impurities
from the fuel tank/s by following the instructions contained in the
manual supplied by the tank manufacturer.
Proceed as necessary based on the structure or location of the tank:
engines that operate in adverse environments and conditions and/or
that are refuelled using drums or jerry cans, require more attention
when cleaning the tank.
Change the engine coolant
Only proceed when the engine is not turning, and is at low
temperature, so as not to run the risk of burns.
 Place a container for collecting coolant under the heat exchanger
(radiator).
 Remove the pressurization cap from the expansion tank.
 Loosen the fastening elements and remove the coupling sleeves
connecting the engine cooling circuit to the heat exchanger.
 Drain the coolant from the heat exchanger (radiator) and wait until
it is completely empty.
 Once emptied, restore the integrity of the cooling circuit, by
ensuring the perfect seal of the sleeves.
 Refill the engine and the heat exchanger until the cooling circuit has
been completely refilled using a mixture of 50% water and
PARAFLU 11, as contained in the section FLUIDS. Do not fill the
expansion tank to the brim.
 With the coolant filler plug open, start the engine and let it idle for
approx. one minute. This helps to completely bleed the air
contained in the cooling circuit.
 Stop the engine and then top up with coolant if necessary.
 When the engine is cold, make sure that the coolant in the
expansion tank is a few centimetres below the filling hole.
In the event of an externally located level indicator as regards the heat
exchangers, proceed with the top up operation by making sure that
the coolant does not overfill the internal volume of the exchanger in
order to allow the expansion of coolant volume during increases in
temperature.
The failure to observe the aforesaid procedure does not
guarantee the presence of the correct quantity of
coolant in the engine.
ATTENTION!
When the engine is hot, pressure builds up in the
cooling circuits which may eject hot liquid violently,
resulting in a risk of burns. Open the filler cap of the
coolant tank only if necessary and only when the
engine is cold.