WÄRTSILÄ Vasa R22, Instruction Manual

Page: 115 / 297

08.2.4 Operation with removed piston and
connecting rod
If damage on piston, connecting rod or big end bearing cannot be
repaired, the following can be done to allow emergency operation:
1 Remove the piston and the connecting rod.
2 Cover lubricating oil bore in crank pin with a suitable
hose clip, and secure.
3 Fit completely assembled cylinder head but omit valve
push rods.
4 Prevent starting air entry to the cylinder head by re-
moving pilot air pipe.
5 Shut down injection pump
(chapter 16.).
Attention! Concerning torsional vibrations and other vibrations, see
chapter 08., section 08.2.5.
With one cylinder out of operation, reduce load to prevent exhaust
temperature of the remaining cylinders from exceeding normal
full load temperatures.
If the turbocharger(s) surge, reduce load further to avoid continu-
ous surging.
Operation with piston and connecting rod of one or more cylinders
removed should be performed only in absolute emergency condi-
tions when there are no other means of proceeding under own
power.
08.2.5 Torsional vibrations and other vibrations
When running the engine with one cylinder, or more, out of
operation, the balance of the engine is disturbed, and severe, or
even dangerous, vibrations may occur. The vibration conditions
are in practice dependent on the type of the installation.
As a general advice when there are cylinders out of order:
•
reduce load as much as possible,
•
keep the speed in a favourable range (completely depending
on the type of installation,
•
if one or several pistons are removed, lowest possible speed
should be used.
22-9601 Operating Troubles, Emergency Operation 08
VASA 22 08 - 7