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1 © Wärtsilä 27 September 2007 W50DF04V00BTM01A Rev. 01
04.
COOLING WATER SYSTEMWÄRTSILÄ W50DF
STANDARD ENGINE
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2 © Wärtsilä 27 September 2007 W50DF04V00BTM01A Rev. 01
04 COOLING WATER SYSTEM
Cooling water system arrangement - Internal
Fig. name: Principal scheme of internal cooling water system
Treated cooling water is used for coolingthe cylinder liners, cylinder heads,
exhaust valve seats, charge air and
lubricating oil.
The cooling water system is also needed
for controlling the temperature of charge
air after the turbocharger.
System components
01 HT water pump
02 Charge air cooler (HT)
03 LT water pump
04 Charge air cooler (LT)
05 Non-return valve
06 Orifice
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3 © Wärtsilä 27 September 2007 W50DF04V00BTM01A Rev. 01
04 COOLING WATER SYSTEM
Cooling water system arrangement - Internal
Fig. name: Principal scheme of internal cooling water system
Connections 401 HT water inlet
402 HT water outlet
404A HT water air vent, A-bank
404B HT water air vent, B-bank
406 HT water inlet from pre-heater
411 HT water drain
416A HT water air vent from air cooler, A-bank
416B HT water air vent from air cooler, B-bank
451 LT water inlet
452 LT water outlet
454A LT water air vent from air cooler, A-bank
454B LT water air vent from air cooler, B-bank
460 LT water to alternator
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4 © Wärtsilä 27 September 2007 W50DF04V00BTM01A Rev. 01
04 COOLING WATER SYSTEM
HT cooling water system on engineThe High Temperature cooling water systemcools cylinder liners, cylinder heads, exhaust
valve seats and the first stage of the charge
air cooler.
Connections
401 HT water inlet
402 HT water outlet
404 HT water air vent
406 HT water inlet from pre-heater
411 HT water drain
416 HT water air vent from air cooler
System components
01 HT water pump
02 Water connection piece
03 Return pipe
04 Charge air cooler (HT side) 05 Water connection
Fig. name: HT water system
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5 © Wärtsilä 27 September 2007 W50DF04V00BTM01A Rev. 01
04 COOLING WATER SYSTEM
Cooling water circulation in cylinder head
Fig. name: Cooling water circulation in cylinder head
HT water to the cylinder head comes from the cylinder liner,flows around the exhaust valve seat rings and starting air
delivery valve, around the fuel injection valve and continues
upwards to the cylinder head water space.
The seat cooling circuit cools the exhaust valve seats and
valves against thermal load.
Components
01 Exhaust valve seat ring
02 Inlet valve seat ring
03 Starting air delivery valve in cylinder head
04 Fuel injection valve
05 Center sleeve
06 Sleeve
Connections
A Cooling water to exhaust valve seat ring
B Cooling water to starting air valve
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6 © Wärtsilä 27 September 2007 W50DF04V00BTM01A Rev. 01
04 COOLING WATER SYSTEM
Water connection pieceThe water connection piece on top of thecylinder head leads the HT water to the return
pipe.
Fig. name: Water connection piece
Components
01 Water connection piece
02 Return pipe
03 Flange
04 O-ring
05 Slide ring gasket 06 Screw
07 O-ring
08 Stud
09 Nut
10 Sleeve
Connections
A HT water from cylinder head
B HT water to charge air cooler
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7 © Wärtsilä 27 September 2007 W50DF04V00BTM01A Rev. 01
04 COOLING WATER SYSTEM
HT water venting system
The HT circuit venting pipes are connected to theexpansion tank from the highest point of the piping.
The HT venting system separates and removes air
from the HT water system and prevents the forming of
heat transfer hindering air pockets in the air cooler.
Fig. name: HT venting system
Components
01 HT venting pipe from air cooler
02 Water connection piece
03 Return pipe 04 Charge air cooler (HT side)
05 Water connection
Connections
404 HT water air vent
416 HT water air vent from air cooler
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8 © Wärtsilä 27 September 2007 W50DF04V00BTM01A Rev. 01
04 COOLING WATER SYSTEM
LT cooling water system on engine
The Low Temperature cooling water systemcontrols the temperatures of the second stage
of charge air cooler and the lubricating oil.
Fig. name: LT water system
Components
01 LT water pump
02 Charge air cooler (LT side)
Connections
451 LT water inlet
452 LT water outlet
454 LT water air vent from air cooler
460 LT water to alternator
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9 © Wärtsilä 27 September 2007 W50DF04V00BTM01A Rev. 01
04 COOLING WATER SYSTEM
LT water venting system
The LT circuit venting pipe starts from the top of the charge air cooler LT side and it is connected
to the expansion tank.
The LT venting system prevents the forming of
heat transfer hindering air pockets in the air
cooler.
Connections
454 LT water air vent from air cooler
Components
01 LT water venting pipe
02 Charge air cooler (LT side)
Fig. name: LT venting system
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10 © Wärtsilä 27 September 2007 W50DF04V00BTM01A Rev. 01
04 COOLING WATER SYSTEM
Built-on LT and HT water pumps
The engine driven LT and HT water pumps areboth centrifugal pumps driven by a gear
mechanism at the free end of the engine.
The main components are made of cast iron and
the shafts are made of acid resistant steel.
System components
01 LT water pump
02 HT water pump
03 Non-return valve
Fig. name: Engine driven water pumps at pump cover
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11 © Wärtsilä 27 September 2007 W50DF04V00BTM01A Rev. 01
04 COOLING WATER SYSTEM
Built-on LT and HT water pumps
Fig. name: Cross section of cooling water pump
Components 01 Pressure housing
02 Impeller
03 Washer
04 Screw
05 Screw plug
06 O-ring
07 Suction flange
08 Lock nut
09 O-ring
10 Sealing flange
11 Oil seal
Connections
A Suction side
B Pressure side
12 Front bearing
13 Housing
14 Shaft
15 Rear bearing
16 Retaining ring
17 Shaft sealing
18 Ring
19 O-ring
20 Bearing flange
21 Support ring
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12 © Wärtsilä 27 September 2007 W50DF04V00BTM01A Rev. 01
04 COOLING WATER SYSTEM
Drive gear for cooling water pump
Fig. name: Drive gear for cooling water pump
Components
01 Driving gear wheel on crankshaft
02 Gear wheel for water pump
03 Clamping ring
04 Screw
The LT and HT water pumps are driven by a gear mechanism at the free end of the engine.