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12. Cylinder Head with Valves
12.1 General description
The cylinder heads are cast of special quality grey iron. Each head
includes two inlet valves (10), two exhaust valves (9), a centrally
located fuel injection valve (4), a starting valve (13) and an
indicator valve (12).The cylinder heads are individually tightened
to the engine block with four studs and hydraulically tightened
nuts. A metallic gasket is sealing between the cylinder liner and
the cylinder head.
V-engines have starting valves only on A-bank cylinders. On
B-bank cylinders is the starting valve replaced with a dummy.
The inlet and exhaust valves are designed with hard-faced seat
surfaces and chromium-plated stems and they tight against
shrunk-in seat rings in the cylinder head. The exhaust valves are
equipped with valve rotators (6). Also inlet valves can at request
be delivered with valve rotators. The exhaust valve seats (8) are
water-cooled.
Cylinder head
The four screw and box-cone design is a traditional and well
proven design for cylinder heads. The benefits of four screws is
not only the ease of maintenance but it also allows the design of
large and correctly designed 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
1. Bearing bracket
2. Rocker arm
3. Yoke for valves
4. Injection valve
5. Cylinder head
6. Rotocap
7. Connection piece
8. Exhaust valve seat
9. Exhaust valve
10. Inlet valve
11. Inlet valve seat
12. Indicator valve
13. Starting valve
14. Push rod
15. Water pipe
3
5
1
2
8
9
11
10
12
11
6
4
7
13
15
14
Fig 12-1
2212519206
22-9601 Cylinder Head with Valves 12
VASA 22 12 - 1