Raw Water System
WARNING!
Risk of water entry. Close and drain the raw water
system before starting any work on the system.
Raw Water System, Draining
1 Close the raw water in- and outlet cocks.
2 Open the drains, refer to chapter
General, page 67, and allow the water to drain.
IMPORTANT!
Check that the raw water really drains. Deposits may
need to be removed from inside the drain plugs/taps.
Impeller, raw water pump
Checking and changing
IMPORTANT!
Always keep a spare impeller and gasket in store
aboard the ship.
1 Close the raw water cocks and drain the external
cooling water as described in the chapter draining
the raw water system.
2 Remove the pump end cover (1), the seal (2), and
the impeller(3).
3 Inspect the impeller. Change the impeller if there
are any visible cracks or other defects.
4 Clean the inside of the housing. Lubricate the pump
housing and the inside of the cover with water-
resistant grease (non-aggressive on rubber).
5 Push the impeller into position while rotating it in the
normal operating direction.
6 Fit the cover with a new seal.
7 Open the raw water cocks.
Maintenance
47713337 03-2021 © AB VOLVO PENTA 83
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