Maintenance1715−1/A1 RT-flex50-D
Wärtsilä Switzerland Ltd
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2. Checking the pre-tension
⇒ Clean the threads of the screws and the seating surfaces. Subsequently apply
MOLYKOTE G paste to the threads.
⇒ Place pre-tensioning jack 94145 on the screw to be checked, and screw it
completely down with vent screw 6 open until there is only little or no clearance
at ’x’ (Fig. ’B’).
⇒ Connect pre-tensioning jack to HP oil pump 94931 as shown in Fig. ’B’.
⇒ Shut relief valve ’EV’ and actuate HP oil pump till oil flows bubble-free at vent
screw 6.
⇒ Close vent screw, tension the foundation bolt with 310 bar and keep pressure
constant.
Check with feeler gauge through slot ’KO’ if there is any clearance between nut 4
and its seating.
⇒ If there is no clearance, this means that the tensioning condition of the screw
has remained unchanged since the last check. The pressure can be released
to zero and the pre-tensioning jack removed.
Should a clearance be found, nut 4 must be tightened down onto its seating
with round bar ’RS’ while the pressure is kept at 310 bar (check with feeler
gauge). Subsequently lower the pressure to zero.
B
6
1
94931
EV
94935
94934a
94934a
3
x
012.902/05
5
2
4
8
BN
RS
KO
3. Loosening the screws
If the screws must be loosened, first screw on pre-tensioning jack 94145 complete-
ly, then loosen it by about ½ turn. Afterwards tension the screw with 330 bar, and
turn nut 4 back by one turn.
Pistons 3 of the pre-tensioning jacks must never exceed red limiting grooves ’BN’.
Engine Stays with Friction Shims: Checking the Pre-tension
2010
CHECK
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