Volkswagen Marine SDI Series Operating Manual page 61

INSPECTION
Flushing and draining seawater
cooling system
Important
Observe the safety precautions
beginning on page 17 before
performing out any work on the
engine or
compartment.
Flushing and subsequent draining of the
seawater cooling system with fresh water
is very important for preventing corrosion
and frost damage.
The flushing process should be carried out
together with the engine oil change.
Conduct flushing in the specified order:
1 - Close the seawater valve.
2 - Open and clean the seawater filter - see
page 42.
3 - Fill the seawater filter with fresh water
and run the engine at idle.
Make sure that the seawater filter is
always filled with fresh water to
prevent the seawater pump from
running dry. This would cause the
pump to be come defective.
60
60
BM4-018M
in the engine
1 2
It is important that the engine runs for a
while so that all sludge and salt residues are
flushed away that could otherwise promote
corrosion.
4 - Switch off the engine again.
5 - Screw on the cover of the seawater
filter.
6 - Fit a suitable hose on the connection -
see Fig. BM4-018M - of the drain
screw 1.
7 - Open the drain screw 1 - see Fig.
BM4-018M - and catch the water with
a suitable container.
8 - Losen the retaining clip 2 - see Fig.
BM4-021M - and pull off the hose.
Catch the water with a suitable con-
tainer.
9 - After draining is complete, pull the hose
off the drain screw 1 again, close the
drain screw 1 and reattach the hose 2.
Note
Also remember to remove the water from
the exhaust plenum chamber. For an exact
description of the process, please see the
manual of the respective manufacturer.
BM4-021M
INSPECTION