Volvo Penta D4 Series Operator's Manual page 90

Maintenance
88
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 cock where fitted.
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 Move the hose to stop cock (3).
Open stop cock (3) and drain all coolant. Close the
stop cock.
6 Refit the drain hose to stop cock (1).
7 Open the sea cock where fitted.
47702599 12-2011