Assembly Of 2-Part Gear Wheel; Work Sequence - WÄRTSILÄ RT-flex50-D Maintenance Manual

RT-flex50-D
Replacing the Gear Wheel on the Crankshaft
3.

Assembly of 2-part gear wheel

C
MOLYKOTE G
LOCTITE 262
DEGREASE
SPLINT PIN
D
6
Wärtsilä Switzerland Ltd
Maintenance
D
Before assembling, the centring diameter of the crankshaft flange as well as
the centre hole of the gear wheel with the corresponding flange faces must be
well cleaned and degreased (Fig. 'B'). Do not use neither oil nor MOLYKOTE.
All surfaces must be in faultless condition.
Remark: The assembly of the gear wheel must be carried out carefully, since rela-
tively small faults could have a negative influence on the operating performance of
all gear wheels of the drive.
The connection consists of four waisted studs 3, each of them comprising two
castle nuts 4 and bases 5 (Fig. 'C').
4
5
3
9
1
5
4
001.168/97
1
3
001.167/97
⇒ Before assembling the gear wheel halves, fit two
waisted studs crosswise into each half.
⇒ Fasten a base 5 and a castle nut 4 on either side
of each waisted stud.
The projection 'X' of the waisted stud with respect
to the castle nut must be 2 mm.
⇒ Before fitting the castle nut, degrease the thread
and apply LOCTITE 262 to it.
⇒ In addition, secure the castle nut with a split pin to
prevent it from slipping when tightening the waist-
ed studs afterwards.
D
Wait one or two days before tightening the waisted
studs in order to ensure thorough curing of the
LOCTITE.
Remark: The castle nut secured with LOCTITE and a
split pin must be fitted in such a way that the waisted stud
can be tensioned together with the castle nut opposite,
as shown in Fig. 'I'.
3.1

Work sequence

⇒ Turn the crankshaft so that the mark on the crank-
shaft flange is approximately horizontal with re-
gard to the crankshaft centre line.
⇒ Put one gear wheel half with two pre-assembled
waisted studs 3 on the centring diameter of the
crankshaft flange in such a way that the joint face
of the gear wheel coincides with the mark on the
crankshaft flange. The designation DRIVING END
located on the front of the gear wheel must be on
the side of the flywheel.
⇒ Insert flange screws 6 (Fig. 'D') each in the centre
and at both ends of the gear wheel half 1 and tight-
en them temporarily.
3/ 5
4103−3/A1
2010