WÄRTSILÄ VASA 6L32, Instruction Manual

Page: 181 / 394

9 Following limits of misalignment are stated for an engine
having normal running temperature (within 10 min after run-
ning at 60 % load, or higher, for 6 h, or more):
For evaluating the vertical alignment should the difference be-
tween C and it’s opposite reading, i.e. the mean value E and A be
used.
a) on the same crank, the difference between two diametrically
opposed readings must not exceed 0.08 mm after installing or
re-aligning. Re-alignment is necessary if this limit is exceeded by
more than 0.04 mm. Except the cranks in the both ends.
b) on two adjacent cranks, the difference between two corre-
sponding readings must not exceed 0.06 mm, for crank No.1 to
No.2 0.08 mm if flex. coupling and 0.06 mm if fixed coupling.
Re-alignment is necessary if these limits are exceeded by more
than 0.02 mm.
c) when the crank pin for cyl.1 is at TDC, the reading should
be negative, max. -0.12 mm (-0.13 mm if flex. coupling).
d) when the last crank pin in the free end is at TDC in case
of PTO with support bearing, should the reading be positive
max. 0.13 mm.
Before re-aligning the engine and the driven machinery, a
control measurement of the main bearings should be made.
Note! In an engine having a normal ambient temperature, the cor-
responding values must be based on experiences from the
particular installation.
11.2.3 Measurement of thrust bearing axial clearance
1 Lubricate the bearings by running the prelubricating
pump for a few minutes.
2 Apply a measure gauge, for instance, against the plane
end surface of the flywheel.
3 Move the crankshaft by a suitable lever in either direc-
tion until contact is established with the thrust bearing.
4 Set the measure gauge at zero.
5 Move the crankshaft in the opposite direction, and read
the axial clearance from the measure gauge.
Note! Repeat the movement of crankshaft to ensure that correct
clearance is measured.
32-200020 Crank Mechanism: Crankshaft, Connecting Rod, Piston 11
WÄRTSILÄ 32 11 - 3