8.2
PRIMARY CIRCUIT
This circuit cools down the engine, the lubricant oil, and often the exhaust manifold, as well. The pri-
mary circuit is enclosed and pressurised, and except for the keel-cooling system, it does not require
installation procedures. However, installers must pay special attention to the following:
Filling
The engine installation must guarantee easy filling and coolant level control. The filling volume ranges
from 8 to 10 litres per minute, and the procedure should be carried out by the dockyard personnel.
Make sure there are no air bubbles in the circuit, which might cause localised overheating and cavita-
tions. During filling, air could escape from the cooling system to the charging and expansion tank
installed on the engine. It is necessary to consult each engine use and maintenance manual to verify
whether to open the corresponding degassing plugs.
To ensure the total escape of the air and the complete filling of the circuit, the engine must be tilted
backward when installed.
Coolant tank
The engine has an expansion and charging tank to receive the coolant when its volume increases due
to heating, and to release it when the engine cools down.The tank filler has a cap to guarantee circuit
pressurisation calibrated at 0.5 - 1 bar. Pressurisation increases the liquid boiling point, so cavitations in
the circulation pump are avoided.To increase expansion volumes, an extra tank could be set up in some
cases. It should be connected to the main tank by a pipe fastened to the overfilled hose-end valve.This
tank cap must have a vacuum valve for liquid reflux during engine cooling.This non-pressurised second
tank, generally made of transparent material, is suitable to be installed to control the level easily, even
though it must also be periodically controlled in the main tank.
Heater
It is possible to set up a heater to obtain hot water, taking advantage of the coolant residual heat. Make
sure that:
■
the serpentine highest point is not higher than the filling tank point
■
in the connexion pipe there is a degassing plug near the serpentine upper section
■
liquid drainage and filling points are the ones suggested in the installation layout.
8.3
SECONDARY CIRCUIT
It cools down the engine coolant, the turbocharger air and transmission oil, if applicable.The water taken
through a seacock valve at the bottom of the hull is circulated by a positive-displacement pump placed
in the engine for this purpose. Small quantities of water may be allowed to drip behind the inter-
changers to refrigerate the packing gland.
The following items are part of the dockyard personnel’s responsibilities:
MARCH 2004
COOLING
8.84
MARINE ENGINES INSTALLATION
Summary of Contents for Marine Diesel Engines
Page 1: ...MARINE DIESEL ENGINES INSTALLATION HANDBOOK T E C H N O L O G I C A L E X C E L L E N C E ...
Page 8: ...MARCH 2004 INTRODUCTION 1 8 MARINE ENGINES INSTALLATION ...
Page 24: ...MARCH 2004 ENGINE BOAT CHOICE FACTORS 2 24 MARINE ENGINES INSTALLATION ...
Page 34: ...MARCH 2004 DRIVE 3 34 MARINE ENGINES INSTALLATION ...
Page 50: ...MARCH 2004 DRIVE 3 50 MARINE ENGINES INSTALLATION ...
Page 52: ...MARCH 2004 ENGINE INSTALLATION 4 52 MARINE ENGINES INSTALLATION ...
Page 60: ...MARCH 2004 AIR SUPPLY 5 60 MARINE ENGINES INSTALLATION ...
Page 64: ...MARCH 2004 AIR SUPPLY 5 64 MARINE ENGINES INSTALLATION ...
Page 66: ...MARCH 2004 FUEL SUPPLY 6 66 MARINE ENGINES INSTALLATION ...
Page 74: ...MARCH 2004 FUEL SUPPLY 6 74 MARINE ENGINES INSTALLATION ...
Page 76: ...MARCH 2004 LUBRICATION 7 76 MARINE ENGINES INSTALLATION ...
Page 80: ...MARCH 2004 LUBRICATION 7 80 MARINE ENGINES INSTALLATION ...
Page 82: ...MARCH 2004 COOLING 8 82 MARINE ENGINES INSTALLATION ...
Page 92: ...MARCH 2004 DISCHARGE 9 92 MARINE ENGINES INSTALLATION ...
Page 98: ...MARCH 2004 DISCHARGE 9 98 MARINE ENGINES INSTALLATION ...
Page 100: ...MARCH 2004 AUXILIARY SERVICES 10 100 MARINE ENGINES INSTALLATION ...
Page 104: ...MARCH 2004 AUXILIARY SERVICES 10 104 MARINE ENGINES INSTALLATION ...
Page 106: ...MARCH 2004 CONTROLS 11 106 MARINE ENGINES INSTALLATION ...
Page 110: ...MARCH 2004 ELECTRICAL INSTALLATION 12 110 MARINE ENGINES INSTALLATION ...
Page 120: ...MARCH 2004 GALVANIC CORROSION PROTECTION 13 120 MARINE ENGINES INSTALLATION ...
Page 126: ...MARCH 2004 CONTROL TEST PROCEDURES 14 126 MARINE ENGINES INSTALLATION ...
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