Craftsman CM4.33 - Page 22

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22
craftsman marine diesel engines CM4.33 / cm4.42
Check-up of coolant level
Always verify the level of the cooling uid when the
engine is cold. Open the ller cap on the expansion
tank (if tted) or else the ller 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 ller pipe.
If so required, top up with fresh cooling liquid (see page
43 )
Replace cooling liquid
Remove the two drain plugs of the cooling system from
the engine block (1) and the housing of the heat exchan-
ger (2). Remove the ller cap from the expansion 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 lled through the ller cap on
top of the heat exchanger housing or, as the case may
be, of the expansion tank.
Before lling 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.
You may also use ready-made cooling liquid; see page
43 for the relevant specications of the recommended
coolant.
Top up to a level of about 1 cm below the bottom of the
ller pipe.
After the engine being commissioned for the rst time,
i.e. has warmed-up and cooled down completely there-
after, check again the coolant level and top up if neces-
sary.
Open the ller cap on top of the heat ex-
changer housing only when the en-
gine is cold.
Never add sea (or salt) water into the
inner cooling circuit!
Cooling liquid
11 Maintenance and inspection
1. 2.