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1 © Wärtsilä 21 December 2007 W4604L00BTM11A Rev. 01

04 COOLING WATER SYSTEMWÄRTSILÄ L46

WITH BUILT-ON CW PUMPS

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2 © Wärtsilä 21 December 2007 W4604L00BTM11A 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 cooling the cylinder liners, charge air, lubricating oil and cylinder heads

including exhaust valve seats and fuel injection nozzle.

System components

01 HT water pump

02 Charge air cooler (HT)

03 LT water pump

04 Charge air cooler (LT)

05 Non-return valve

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 

451 LT water inlet 452 LT water outlet

454 LT water air vent from air cooler 

468 LT water air cooler by-pass

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3 © Wärtsilä 21 December 2007 W4604L00BTM11A Rev. 01

04 COOLING WATER SYSTEM

HT cooling water system on engine

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

The High Temperature cooling water systemcools cylinder liners, cylinder heads including

exhaust valve seats and fuel injection nozzle,

and the first stage of the charge air cooler.

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4 © Wärtsilä 21 December 2007 W4604L00BTM11A 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 fuel injection

nozzle and continues upwards from the cylinder head water 

space to the return pipe.

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

04 Fuel injection nozzle

05 Center sleeve

Connections

 A Cooling water from cylinder liner 

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5 © Wärtsilä 21 December 2007 W4604L00BTM11A Rev. 01

04 COOLING WATER SYSTEM

Water connection pieceThe water connection piece on top of the cylinder 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 Screw plug

09 Stud

10 Nut

11 Sleeve

Connections

 A HT water from cylinder head

B HT water to charge air cooler 

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6 © Wärtsilä 21 December 2007 W4604L00BTM11A Rev. 01

04 COOLING WATER SYSTEM

Fig. name: HT venting system

The HT circuit venting pipes are connected to theexpansion tank from the highest point of the piping

and from the top of the air cooler HT side.

The HT venting system separates and removes air 

from the HT water system.

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 

HT water venting system

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8 © Wärtsilä 21 December 2007 W4604L00BTM11A 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 separates and removes air 

from the LT water system.

Fig. name: LT venting system

System components

01 LT water venting pipe

02 Charge air cooler (LT side)

Connections

454 LT water air vent from air cooler 

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9 © Wärtsilä 21 December 2007 W4604L00BTM11A Rev. 01

04 COOLING WATER SYSTEM

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

Built-on LT and HT water pumps

Fig. name: Engine driven water pumps at pump cover 

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10 © Wärtsilä 21 December 2007 W4604L00BTM11A 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

12 Front bearing

13 Housing

14 Shaft

15 Rear bearing

16 Retaining ring

17 Mechanical seal

Connections

 A Suction side

B Pressure side

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11 © Wärtsilä 21 December 2007 W4604L00BTM11A 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 Pair of friction rings

04 Clamping ring

05 Screw

The LT and HT water pumps are driven by a gear mechanism at the free end of the engine.