WÄRTSILÄ PAAE051728, Instruction Manual

Page: 198 / 394

12.1.1 Functions
The flame plate of the cylinder head is a part of the combustion
chamber. During the combustion, the flame plate is exposed to
high pressures and high temperatures. Combustion air is led from
the air receiver through the multiduct and the cylinder head inlet
channel into the cylinder. The air flow is governed by two inlet
valves in the flame plate. In a similar way, the exhaust gas is led
from the cylinder through the cylinder head exhaust channel and
the multiduct to the exhaust manifold. The gas flow is governed
by two exhaust valves.
The multi-orifice injection valve, as well as injection valve
sleeve, is centrally mounted in the cylinder head. The injection
valve sleeve holds the injection valve in position and separates
the injection valve from the cooling water.
Each cylinder head is individually cooled by a water flow enter-
ing the cylinder head from the cylinder jacket through one single
bore. There are drilled cooling passages to the exhaust valve seats.
The cooling water is collected to a single flow after passing the
flame plate and the seat rings. The cooling water flows out from
the cylinder head direct to the multiduct. Any possible air or gas
in the cooling water is vented from the top of the multiduct.
The valve mechanism is lubricated from the lube oil system. The
oil is led through a pipe from the valve tappet guide in the
multihousing to the rocker arm bracket. All other flows in the
cylinder head are through drilling’s.
The controlled leaks of the injection valve is returned through
the protection pipe.
The fuel pipe is also provided with protection against hazardous
leaks from the high pressure connection stud.
12.2 Removing and mounting of the cylinder head
12.2.1 Removing of the cylinder head
1 Drain the cooling water.
2 Open the indicator valves.
3 Remove the side covers.
4 Remove the cylinder head cover.
5 Turn the engine until both the inlet and exhaust valves
are closed
and remove the valve rocker arm bracket and the
push rods.
6 Remove the fastening screws of the multiduct.
7 Remove the injection pipe
according to section 16.2.
Protect all pipe connections.
8 Remove the connector
of the temperature sensor.
Hydraulic oil
DISMANTLING
1. Mount the cylinders by hand
2. Connect hoses, open valve.
Tighten cylinders by hand.
3. Turn the cylinders 180˚
counter -clockwise.
4. Close valve, rise pressure.
5. Open the nut about half a turn.
6. Open release valve, remove tool.
12 Cylinder Head with Valves 32-200646-01
12 - 2 WÄRTSILÄ 32