Volvo Penta D4 Series Operator's Manual page 93

Maintenance
Seawater Filter, Check and Cleaning
WARNING!
Risk of water entry. Close the seawater cocks before
doing any work on the seawater system.
If the water where the boat is used contains contami-
nants, seaweed, etc. the filter should be checked more
frequently than stated in the maintenance schedule.
Otherwise there is a risk that the filter may be blocked
resulting engine overheating.
1 Close the sea cock.
2 Unscrew the cover (1) and remove the sealing plate
(2).
3 Lift out the insert (3) and clean it.
4 Replace parts as illustrated.
5 Open the sea cock and check for leaks.
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