STEYR MOTORS Marine Engine 2012 Series, Service Manual

Page: 217 / 274

Cooling System
11/21 Z001138-1_2013-02-01
05.00.07 Drain the coolant from engine
To drain the closed cooling circuit, lift or lower
the engine in such a way that the engine is in
horizontal position, which permits an ideal
drainage of engine block.
ATTENTION: Approx. 1 litre of coolant will
remain in the engine block
which is to be considered for
refilling.
With hot engine, the closed
cooling circuit is under
pressure. Do not try to open
the pressure cap on the
expansion vessel or any drain
plug or hoses of the coolant
system. This may lead to
severe injuries by hot coolant
under pressure. Wait until the
engine has cooled down, then
the pressure cap may be
opened by 1/4 turn to the left,
to release possibly remaining
system pressure. Then press
down the cap, turn and
remove.
1. Loosen hose clamp on lower coolant hose
at oil cooler unit. Pull hose from oil cooler
nipple and drain coolant into bucket.
NOTE : There is no drain plug on the engine
through which the coolant from the internal
cooling circuit can be drained.
ATTENTION: The closed cooling circuit
must always be filled with
coolant. If the circuit remains
for a long time without
coolant, corrosion damages
may occur.