
Cooling system
80
IMPORTANT! To ensure there are no leaks in
the cooling system, carry out a simple pressure
test before bringing the installation into service.
The following pressure conditions must be
fullfilled according to figures on previous page:
A. The pressure on the seawater suction side of
the pump (P
A
), measured immediately before the
pump, and with the engine running at max. rpm,
must not be less than 0.2 bar (2.9 psi) for D5/D7
and –0.3 bar (–4.4 psi) for all other engines. It
must not be higher than .0 bar (4.5 psi).
B. The pressure after the seawater pump (P
B
max)
must not be exceed bar (4.5 psi) for D5/D7 and
2.5 bar (36.3 psi) for all other engines.
C. When the engine is installed higher than the maxi-
mum suction head of the pump, 3 m (9'), an extra
seawater pump must be installed.
D. The seawater intake, the valve, the strainer hoses
and piping must have sufficient flow area to avoid
restriction losses. Any bends in the line must be
swept, to avoid unnecessary restriction losses.
Copper pipe is recommended. It should be ar-
ranged in a U-bend to reduce stresses, and must
be connected with reinforced rubber hose. To pre-
vent collapse, the hose must have several layers
of fabric.
E. The temperature increase of the seawater,
∆
t
B-E
and the pressure increase,
∆
P
A
give a good un-
derstanding of the function of the system. For tem-
perature increase, see table on page 8.
Where a genuine Volvo Penta seawater pump is re-
placed with a different type of pump, the flow must be
measured.
A flowmeter is installed in the outgoing seawater
line after the reverse gear oil cooler, and the seawa-
ter flow is checked with the engine running at max.
speed.
For the recommended seawater flows for the vari-
ous engines at different speeds, see
Sales Guide
Marine Propulsion Diesel Engines
for each engine
type and rpm.
Volvo Penta standard cooling systems are designed
for a max. seawater temperature of
32°C (90°F).
Содержание D11 series
Страница 1: ...Marine Propulsion Diesel Engines Installation 1 1 D E D5 D16 series ...
Страница 2: ......
Страница 208: ...206 References to Service Bulletins Group No Date Concerns ...
Страница 209: ...207 Notes ...
Страница 210: ...208 Notes ...
Страница 212: ...7748655 English 11 2007 ...