WÄRTSILÄ Vasa R22, Instruction Manual

Page: 263 / 297

Next to the governor there is a fixed mechanical limiter affecting
the control shaft directly by means of the lever (18).
22.2 Maintenance
Special attention should be paid to the function of the system
as a defect in the system may result in a disastrous overspeed-
ing of the engine or in the engine not being able to take load.
a) The system should work with minimum friction. Clean and lu-
bricate regularly the racks, connection piece, bearings (also the
self-lubricating bearings (12)) and the ball joints with lubricat-
ing oil.
The maximum torque to which the control shaft can be moved
at running temperatures (the speed governor disconnected) is
1 Nm/cylinder(= 8 Nm for a 8R22/26).
b) The system should be as free from clearances as possible.
Check clearances of all connections. The total clearance may
correspond to maximum 0.5 mm of the injection pump fuel rack
positions.
c) Check regularly (see recommendations in chapter 04.) adjust-
ment of the system; stop position, overspeed trip devices,
starting fuel limiter, see section 22.3.
d) When reassembling the system, check that all details are
placed in the right position, that all nuts are properly tightened
and to torque, if so prescribed, that all locking elements like
pins and self-locking nuts are in positions. Check according to
pos. a - c above.
22.3 Check and adjustment
22.3.1 Stop lever stop position
a) Check:
•
set the terminal shaft lever (23) in maximum fuel position
and the stop lever (14) in stop position,
•
check that the fuel rack position of all injection pumps is less
than 5 mm.
b) Adjustment:
•
set the stop lever in the stop position and check that the lever
(15) contacts the lever (16) properly. A small torque can be
set from the governor, but not a too large one, because this
will twist the shaft unnecessarily, although little,
22 Control Mechanism 22-9601
22 - 2 VASA 22