Seawater System
The raw water system is the engine's external cooling
system. On IPS engines, the raw water pump sucks in
water via the IPS cooling water inlet, through the IPS
unit oil cooler to the raw water pump. The water then
passes through the raw water filter before being
pumped through the fuel cooler, intercooler, engine oil
cooler and heat exchanger. Finally the water is fed out
through the exhaust elbow, where it is mixed with the
exhaust gases.
WARNING!
If the boat is in the water while working on the seawater
system the two seawater cocks on the propulsion units
must be closed. Otherwise there is a risk of flooding of
the engine compartement and sinking of the boat. The
boat must be brought up on land if this is not possible.
A Open
B Closed
Seawater System, Draining
WARNING!
Risk of water entry. Close the seawater cocks before
doing any work on the seawater system.
To prevent frost damage, the raw water system must
be drained during cold weather if there is a risk for frost.
An alternative to draining is to keep the engine room
warm using an approved heater fan.
Draining:
1 Close the sea cocks.
2 Open the drain stop cock (
1
) by unscrewing it care-
fully.
3 Drain the coolant into a container. Screw in the stop
cock by hand.
4 Move the hose on the stop cock (
1
) and connect to
stop cock (
2
).
Open stop cock (
2
) and drain all coolant. Close the
stop cock.
5 Refit the drain hose to stop cock (
1
).
6 Remove hose clamp (
3
) and release the end of the
hose. Drain the coolant from the hose and oil
cooler.
Refit the end of the hose.
7 Open the sea cocks and check for leaks.
A
B
B
A
P0002849
2
1
3
P0006575
Maintenance
80
7748921 04-2008
Содержание D4-260
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