Maintenance
1112−1/A1
RT-flex50-D
Wärtsilä Switzerland Ltd
3/ 3
3. Loosening the foundation bolts
⇒ First screw down pre-tensioning jack 94145 as for checking the pre-tension,
then turn back by ½ turn (gap ’SA’ in Fig. ’E’).
⇒ Connect the pre-tensioning jack to HP oil pump 94931 according to Fig. ’E’.
⇒ Shut relief valve ’EV’ and actuate HP oil pump till oil flows bubble-free at vent
screw 1.
⇒ Close vent screw and pump until a pressure of 1530 bar has been reached.
Piston 3 of the pre-tensioning jack must never exceed the red limiting groove ’BN’
(Fig. ’E’).
⇒ Turn back nut 4 by one turn, release the pressure to ’0’ and remove the pre-
tensioning jack.
E
012.950/0
94935
94934a
94931
EV
94934a
4
13
1
SA
6/7
3
5
BN
2
4. Tensioning the foundation bolts
D Tensioning of the foundation bolts must be carried out in two steps without ex-
ception, for both metal and synthetic chocks, i.e. tension all foundation bolts
first with 900 bar (1
st
step), then finish tensioning with 1500 bar (2
nd
step).
D Tensioning must be carried out as described in ’Checking the pre-tension’.
Checking the Foundation Bolts
2010
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