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11 Maintenance and inspection
Cooling liquid
Check-up of coolant level
Always verify the level of the cooling fluid when
the engine is cold. Open the filler cap on the
expansion tank (if fitted) or else the filler cap on top of
the housing of the heat exchanger and make sure that
the coolant is level is about 1 cm below the bottom of
the filler pipe.
If so required, top up with fresh cooling liquid (see
page 43 )
22
craftsman marine diesel engines CM2.12 , cm2.16 / cm3.27
Replace cooling liquid
Remove the two drain plugs of the cooling system
from the engine block (1) and the housing of the heat
exchanger (2). Remove the filler cap from the expansi-
on tank (and/or the heat exchanger housing), in order
to quickly drain the liquid from the internal cooling
circuit and to make sure that all of the liquid has been
discharged from the engine.
Replace the drain plugs and tighten them well.
The inner cooling circuit is filled through the filler cap
on top of the heat exchanger housing or, as the case
may be, of the expansion tank.
Before filling in the fresh coolant, remove as well the
bolt on top of the cover of the thermostat housing.
This enables the cooling system to be vented
(air-bled).
Fill the system with a mixture of 40% of anti-freeze
and 60% of clean tap water.
1.
You may also use ready-made cooling liquid; see page
43 for the relevant specifications of the recommended
coolant.
Top up to a level of about 1 cm below the bottom of
the filler pipe.
After the engine being commissioned for the first time,
i.e. has warmed-up and cooled down completely
thereafter, check again the coolant level and top up if
necessary.
Open the filler cap on top of the heat
exchanger housing only when the
engine is cold.
Never add sea (or salt) water into the inner cooling
circuit!
2.
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