04 Cooling Water System

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1 © Wärtsilä 27 September 2007 W50DF04V00BTM01A Rev. 01

04.

COOLING WATER SYSTEMWÄRTSILÄ W50DF

STANDARD ENGINE




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





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





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





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





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


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





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


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





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





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





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





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





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.

Documents

04 Cooling Water System