WÄRTSILÄ RT-flex50-D, Maintenance Manual

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Maintenance
0352−2/A1
RT-flex50-D
Wärtsilä Switzerland Ltd
2/ 2
2. Waisted studs
Waisted studs must be tightened according to the values in the following diagram.
D
Before fitting a waisted stud clean its thread and corresponding tap hole. The
sealing faces must be degreased (e.g. using white spirit) and subsequently
primed.
D
Screw in the waisted stud without lubricant on the thread right to the bottom of
the tap hole, and tighten. Always utilize a stud driver or two nuts.
Tools like a pipe wrench etc. which would damage the stud shank must never be
used.
D
For the protection of the waisted stud in the cylinder block and cylinder cover,
fill the annular space above the thread with a non-hardening jointing com-
pound (see
2751−1 ).
TIGHTENING TORQUE FOR WAISTED STUDS
TIGHTENING T
ORQUE [Nm]
400
300
200
10
100
20 30 40 50 60
3500
3000
2500
2000
1500
1000
0
500
10 30 20 40 50 60
0
001.769/97
70 80 100 110 90 120
THREAD DIAMETER [mm]
Tightening Values of Standard Screwed Connections
2010