WÄRTSILÄ Vasa R22, Инструкция по эксплуатации, Страница: 154 / 297

12.3.9 Reassembling of the engine valves
1 Check the valve springs for cracks and wear marks on
the coils. If any, replace the springs by new ones.
2 Put the new seal rings in the valve guides.
3 Lubricate the valve stems with engine oil.
4 Put in the valves and check for free movement.
5 Check that the exhaust valve rotators turn smoothly
by hand. If the movement between upper and lower part of the
rotator is not smooth and free, exchange the complete rotator.
6 Put on the valve springs and spring discs and compress
the springs with the tool set. Fit the valve cotters and unload
the springs. Check that the valve cotters fit properly.
12.4 Indicator valve
12.4.1 Operation and maintenance of the
indicator valve
The inside construction of the indicator valve is such that the
pressure in the cylinder tightens it. Consequently the force
needed to close the valve is relatively low. The valve has a
left-handed screw and is opened and closed respectively as fol-
lows, Fig 12-5. Use the T-handle wrench 808001 to open and close
the indicator valve.
1 When starting the engine the indicator valves should be
closed using only so weak a force that the sealing surfaces go
together. The pressure of the cylinder will push them tightly
together.
2 When stopping the engine, the indicator valves should
be opened only half a turn. Then the tightening caused by a
temperature decrease cannot have an effect.
3 When opening the indicator valve for measuring the
cylinder pressure, tightening to open position by force must be
avoided.
4 When closing the indicator valve after measuring the
cylinder pressure, only a weak torque is needed. A so called
“finger torque” is usually enough.
5 Add a high temperature lubricant (up to 1000°C) to the
valve stem threads when you feel that it is not moving easily.
12 Cylinder Head with Valves 22-9601
12 - 10 VASA 22