Volvo D11 series, Installation Manual

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Cooling system
77
Minimum flow area of seawater intake = .5 x hose
inner cross section area.
Seawater filter
. Inlet via sea cock.
2. Outlet to seawater pump.
3. Clearance for removal of filter basket, about 550 mm.
The seawater filter, as illustrated, is positioned so that
it is easily accessible for servicing, and far enough
above the waterline to ensure that water cannot flow
in, even if the sea cock is not closed.
For necessary seawater flow see
Sales Guide Ma-
rine Propulsion Diesel Engines
for each engine
type.
Any bends in the suction line must be swept and the
line must be correctly dimensioned to avoid any un-
necessary restrictions. Recommended materials for
the suction line are rubber hose, copper pipe or acid-
resistant stainless steel pipe.
Connections above the waterline are to be made with
high-quality rubber hose with several layers of fabric
to resist hose collapse under suction. Double stain-
less steel hoseclamps must be used at both ends of
the hose.
Dimensions of hoses
Dimensions of hoses and pipes for seawater to and
from the engine, see drawings for each engine type.
200 mm
(8")
200 mm
(8")
500 mm
(20")
WL
Anti-siphoning valve
An anti-siphoning valve (vacuum valve) should be fit-
ted in cases where the engine is installed so deep in
the boat that the distance between the exhaust pipe
flange (lower part) and waterline is less than
200
mm (8"). When correctly fitted the valve prevents si-
phoning, that is stopping seawater from entering the
engine.
Height position of the anti-siphoning valve should
be at least 500 mm (20") above waterline. See also
chapter
Exhaust system , Wet exhaust line .
2
1
Flow area of the seawater intake