WinGD WARTSILA RT-flex58T-D, Maintenance Manual

Page: 118 / 498

Maintenance
1903 − 1/A2
RT-flex58T-D
Winterthur Gas & Diesel 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 94005F.
⇒ 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 94005F.
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 n L (’L
1
’ − ’L’) is measured:
n L = 14.5 ... 16.5 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
e c a b d f g
e c a b d f g
SEQUENCE
C
94005F
TIE ROD
ELONGATION
WCH00754
WCH00668
L
L
L
1
3
4
7
Checking the Pre-tension and Tensioning the Tie Rods with M80x6 Thread Diameter
2012 / V2