Maintenance
3303−1/A1
RT-flex50-D
Wärtsilä Switzerland Ltd
4.
Loosening the stud of top end bearing
Remark: For loosening the studs always follow
the sequence shown in Fig. ’D’ i.e. a+ a and b+ b.
⇒
Clean the threads of studs 1 as well as the
area around nuts 2.
⇒
Place pre-tensioning jacks 94315 diago-
nally onto the studs as shown in Fig. ’D’, and
completely screw them on with opened vent
screw 7 until there is only little or no clear-
ance at ’x’ (Fig. ’E’).
⇒
Turn back the pre-tensioning jacks by about
½
turn (gap ’SA’ in Fig. ’E’).
⇒
Connect the pre-tensioning jacks to hy-
draulic unit 94942 as shown in Fig. ’D’.
⇒
Actuate the hydraulic unit till bubble-free oil
flows out through the vent screws. Close
vent screws.
⇒
Actuate the hydraulic unit up to about 1530
bar and keep pressure constant.
Pistons 8 of the pre-tensioning jacks must never
exceed the red limiting grooves ’BN’ (Fig. ’E’).
⇒
Screw back nuts 2 by one turn, using round
bar ’RS’.
⇒
Release pressure to ’0’ at the hydraulic unit
and then remove pre-tensioning jacks.
⇒
Proceed in the same manner for the second
pair of the connecting rod studs.
PRE-TENSIONING JACK
PLACED FOR LOOSENING
PRE-TENSIONING JACK
PLACED FOR TENSIONING
E
F
009.755/02
009.756/02
3
1
2
9
8
BN
7
x
SA
RS
x
KO
BN
D
94315
94934
94934a
94935
I
I
y
y
3
3
94935
a
b
b
a
013.431/05
94942
Loosening and Tensioning the Connecting Rod Studs
2010
Summary of Contents for RT-flex50-D
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