WinGD WARTSILA RT-flex58T-E, Maintenance Manual

Page: 220 / 504

Maintenance
3303 − 1/A1
RT-flex58T-E
Winterthur Gas & Diesel Ltd.
2/ 2
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