WÄRTSILÄ VASA 6L32, Instruction Manual

Page: 244 / 394

15.5 Charge air cooler
Data and dimension
Material
-Tubes:
copper alloy
-Water boxes: cast iron.
Test pressure: 8 bar (water
side)
The charge air cooler is of self-supported type. The housing is
fitted to the engine block.
The air cooler is of tube type. The tubes are provided with thin
fins to get a more efficient cooling of the air. The cooling water
circulates in the tubes, while the charge air passes between the
fins on the outside of the tubes.
15.5.1 General maintenance
1 Condensate from the air is drained
through a small
hole/pipe (8) at the bottom of the cooler housing after the cooler.
Examine regularly that the drain pipe is open by checking the
air flow when running.
If water keeps on dripping or flowing from the draining pipe for
a longer period (unless running in conditions with very high
humidity or with too low LT temperature due to a defective LT
thermostatic valve) the cooler may be leaky and must be
dismantled and pressure tested.
2 At longer stops,
the cooler should be either completely
filled or completely empty, as a half-filled cooler increases the
risk of corrosion. If there is a risk of a lowwater level in the
system when the engine is stopped, drain the cooler com-
pletely. Open the air vent screw at the top of the cooler to avoid
vacuum when draining.
3 Clean and pressure test the cooler
at intervals accord-
ing to chapter 04. or if the receiver temperature cannot be held
within stipulated values at full load.
4 Always when cleaning,
check for corrosion
15.5.2 Dismantling (V-engines)
1 Drain the cooler
trough the draining plugs (36), see Fig
15-8.
2 Loosen the fixing screws
and remove the covers (7), (9),
(10) and (37), see Fig 15-2.
3 Disconnect the external connector X3
if WECS system
is used.
4 Carefully loosen and remove under the cooler 2 pcs of
electrical cables (38),
see Fig 15-2, to enable dismantling of
the air cooler. Loosen and remove the plate (12) holding the
electrical boxes.
15 Turbocharging and Air Cooling 32-200549-10
15 - 10 WÄRTSILÄ 32