WÄRTSILÄ Vasa R22, Instruction Manual

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b) An overspeeding engine is hard to stop. Therefore, check regularly the
adjustment of the control mechanism (the injection pump rack positions)
1) the stop lever being in stop position or the overspeed trip device being
tripped and the speed governor at maximum fuel admission.
2) the stop lever and the overspeed trip being in work position and the speed
governor in stop position.
This control should be done always when the control mechanism or the
injection pumps have been touched.
22.3
08.2 Emergency operation
08.2.1 Operation with defective air cooler(s)
If the water tubes of an air cooler are defective, the cooling water
may enter the cylinders. If water or water mist flows out of the
drain pipe at the bottom of the cooler housing, check whether it
is raw water or condensate. If condensate, reduce cooling (see
chapter 03, Fig 03-1). If raw water, stop the engine as soon as
possible and fit a spare cooler.
If no spare cooler is available, the following can be done as an
emergency solution:
1 Dismantle the cooler for repair and blank off the opening
in the charge air cooler housing. Shut off water supply and
return pipes. Repair the cooler, e.g. by plugging the leaking
tubes.
2 If there is not time enough to remove the defective
cooler
and repair it, shut off water supply and return pipes.
Note! This will influence on the water flow to the tube oil cooler and
the tube oil cooler temperature will increase
3 Operating with a partially plugged, shut-down or re-
moved air cooler. Engine output must be limited so that the
normal full load exhaust temperatures are not exceeded.
The turbocharger may surge before the admissible exhaust
temperatures are reached. In such a case, engine load must be
reduced further to avoid continuous surging.
08.2.2 Operation with defective turbocharger(s)
A defective turbocharger is to be treated in accordance with the
service instructions given in the turbocharger instruction book
(blocking of rotor etc.).
If one turbocharger on a V-engine is defective and must be
blocked, the other charger should be blocked too. The air connec-
tion between the charger and the air coolers should be removed
and the engine will operated as a naturally aspirated engine.
22-9601 Operating Troubles, Emergency Operation 08
VASA 22 08 - 5