WÄRTSILÄ PAAE051728, Instruction Manual

Page: 211 / 394

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 12-9. Use the T-handle wrench 800031 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.
Use only the right T-handle wrench to open and close the
indicator valve.
Open and close indicator valve
The cock moves upward
when closing clockwise
Always use the special
handle when closing !
Fig 12-9
3212558935
32-200646-01 Cylinder Head with Valves 12
WÄRTSILÄ 32 12 - 15