Maintenance1903−1/A2 RT-flex50-D
Wärtsilä Switzerland Ltd
4/ 5
Tensioning in one procedure:
⇒ Connect pre-tensioning jacks with hydraulic unit 94942.
⇒ Actuate the hydraulic unit until bubble-free oil flows out through the vent
screws. Close the vent screws.
⇒ Raise pressure to 100 bar, keep it constant, and firmly tighten the two upper
tie rod nuts 3 with rod 94005b.
⇒ Measure and record distance ’L’ (the measurements can be taken directly on
the mounted pre-tensioning jacks, i.e. from top edge of tie rod 7 to cylinder 4).
⇒ Subsequently tension tie rods with 1500 bar, keep it constant and firmly tight-
en the two upper tie rod nuts 3 with rod 94005b.
Never move pistons 5 of the pre-tensioning jacks further up than to the red limiting
grooves ’BN’.
⇒ Measure again distance ’L’ and record it as ’L
1
’.
The tie rods are correctly tensioned with 1500 bar when the following reference
value of a total elongation nL (’L
1
’−’L’) is measured:
nL = 11.0 ... 12.5 mm
⇒ Release pressure to ’0’.
⇒ Proceed in the same way following the required sequence for all tie rods b/b,
c/c, d/d ect.
⇒ After completing the tensioning, smear the protruding thread portions of all the
tie rods lavishly with acid-free grease and fit protection covers 8.
B
AFT
END
FREE
END
ecab dfg
ecab dfg
SEQUENCE
C
94005b
TIE ROD
ELONGATION
WCH00754
WCH00668
L
L
L
1
3
4
7
Checking the Pre-tension and Tensioning the Tie Rods with M72x6 Thread Diamete
2012-07
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