Volvo Penta D4 Operator's Manual page 42

Engine Shutdown
40
Operation Break
Operation break with the boat in water
If the boat is not used, but left in the water, the engine
must be warmed up at least once every fortnight. This
prevents corrosion damage in the engine.
If you expect the boat to be unused for two months or
more, it must be laid up, please refer to Stor-
age page 98.
Operation break with the boat out of water
Where boats are kept laid up on land when not in use,
there is a lower level of galvanic corrosion protection
due to oxidation on the sacrificial anodes. Before
launching the boat the sacrificial anodes on the drive
and shield must be cleaned with emery paper to
remove any oxidation.
If you expect the boat to be unused for two months or
more, it must be laid up, please refer to Stor-
age page 98.
IMPORTANT!
Use emery paper. Do not use a wire brush or other
steel tools when cleaning, as these may damage the
galvanic protection.
Laying Up and Launching
IMPORTANT!
If the boat submerges significantly below the static
waterline when it is laid up or launched there is a risk
of water entering the engine through the exhaust sys-
tem.
7748934 04-2008