WÄRTSILÄ VASA 6L32, Instruction Manual

Page: 197 / 394

12. Cylinder Head with Valves
12.1 General description
Data and dimensions
Material: nodular cast iron
Weight: 430 kg
Water space
- test pressure: 10 bar
Starting air space
- test pressure: 60 bar
The cylinder heads are cast of nodular cast iron. Each head
includes two inlet valves, two exhaust valves, a centrally located
injection valve and an indicator valve. The cylinder heads are
individually tightened to the cylinder liner with four studs and
hydraulically tightened nuts. A metallic gasket is sealing be-
tween the cylinder liner and the cylinder head. The combustion
air, exhaust gas and water channels are connected to a common
multi-duct, which is connected to the cylinder head by six screws.
The four screw and box-cone design is a traditional and well
proven design for cylinder heads. The design eases maintenance
and allows the design of large channels for combustion air and
exhaust gases. In a heavy fuel engine the correct material tem-
peratures are a crucial factor to ensure long lifetime of the
components being in contact with combustion gases. Efficient
cooling and a rigid design is best achieved with the “double deck”
design in which the flame plate is relatively thin and the mechani-
cal load is transferred to the strong intermediate deck. The most
sensitive areas of the cylinder head are cooled by drilled cooling
channels optimized to distribute the water flow evenly around
valves and the centrally located fuel injector.
The injection valve
is described in chapter 16.
Cylinder head assembly
1. Bearing bracket
2. Rocker arm
3. Yoke for valves
4. Yoke for injection valve
5. Cylinder head
6. Rotocap
7. Screws for connection
piece
8. Exhaust valve seat
9. Exhaust valve
10. Inlet valve
11. Inlet valve seat
12. Indicator valve
13. Temperature sensor
1
2
3
4 5
6
7
8 9 10 11
12
13
Fig 12-1
4012019701
32-200646-01 Cylinder Head with Valves 12
WÄRTSILÄ 32 12 - 1