WÄRTSILÄ Vasa R22, Instruction Manual

Page: 142 / 297

11.4.4 Dismantling (at the flywheel end)
1 Check the axial clearance, section 06.2 pos. 23 B.
2 Unscrew the screw (15) and remove the flange (16).
3 Unscrew the screw (21) and remove the shaft (19). The
whole package counterweights - gear wheel can now be re-
moved.
4 Check the bearing clearance, section 06.2 pos. 23 B.
5 If the bearing clearance exceeds the normal values
or if the bearing is found to be damaged, remove the bearing
bushes (18) by using an extractor, see Fig 11-7 View B.
11.4.5 Assembling
1 Clean throughly the bearing housing, i.e. the counter-
weight and gear wheel and mount new bearings. The bearings
should be cooled down with, for example, liquid air. Note that
the longitudinal oil grooves (28) in the bushes shall point
towards the centre of gravity of the counterweights (marked
with a distinct mark).
2 Mount the bush (20) to the shaft (19), apply LOCTITE
275 on the threads of the fixing screw (21) and tighten the
screw to the torque of 450 Nm.
3 Turn the crankshaft 30° clockwise from the top dead cen-
tre of cylinder 1 (in this position the crank pin of cylinder 1
points straight upwards), see Fig 11-7
4 Put the counterweight, the shaft (19) and the flange (16)
to their places, apply LOCTITE 275 on the threads of the screw
(15)and tighten the screw to the torque of 450 Nm.
5 Measure with a dial indicator the axial clearance of the
bearing bushes in the counterbalance system (see section
06.2 pos. 23 B).
Note! The counterweights shall point straight downwards when the
crank pin of cylinder 1 points straight upwards.
6 Before start check that the bearings get lube oil.
11 Crank Mechanism 22-9601
11 - 16 VASA 22