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Maintenance
3303
−
1/A1
RT-flex58T-D
Winterthur Gas & Diesel Ltd.
2.
Loosening and tensioning the connecting rod studs
2.1
Bottom end bearing
D
Tighten the nuts with a round bar and equally distribute clearance ’y’ between
the bearing halves (bearing protrusion) as shown in Fig. A.
D
Tensioning of the studs of bottom end bearing 4 must be carried out in two
steps without exception, i.e. tension studs first with
300 bar (1
st
step)
, then
finish tensioning with
1000 bar (2
nd
step)
.
Based on the markings applied, check by how much the nuts were turned after pre-
tightening (1
st
step) to the 2
nd
step.
Tightening angle
to be about
60
_
for compari-
son.
2.2
Top end bearing
D
Tighten the nuts with a round bar and equally distribute clearance ’y’ between
the bearing halves (bearing protrusion) as shown in Fig. A.
D
Tensioning of the studs of top end bearing 5 must be carried out in two steps
without exception, i.e. tension all elastic studs first with
600 bar (1
st
step)
,
then finish tensioning with
1000 bar (2
nd
step)
.
Based on the markings applied, check by how much the nuts were turned after pre-
tightening (1
st
step) to the 2
nd
step.
Tightening angle
to be about
25
_
for compari-
son.
D
Moreover,
always
carry out loosening and tightening procedures
crosswise,
i.e. a/a and b/b
for each step
.
a
b
b
a
ARRANGEMENT OF PRE-TENSIONING
JACKS 94315
B
94942
94935A
94934A
94935A
94935
2013
Loosening and Tensioning the Connecting Rod Studs
CHECK
CHECK
Содержание WARTSILA RT-flex58T-D
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