WinGD RT-flex50DF, Maintenance Manual, Page: 95 / 586

Maintenance
1132 − 1/A1
Winterthur Gas & Diesel Ltd.
3/ 3
4. Waisted Studs − Apply Tension
After you install the main bearing cover (see 1132 − 2 ), apply tension to the waisted
studs (3) as follows:
1) Install the double pre-tensioning jacks (94114B) as given in paragraph
2 .
2) Start the hydraulic unit (94942).
3) When oil that has no air flows out, close the vent screw (7,
Fig. 3 ) on the
pre-tensioning jacks (94114B).
4) Operate the hydraulic unit (94942), to get a pressure of 1000 bar. Keep the
pressure constant.
5) Use the round bar (4) to tighten all the nuts (3).
Note: Make sure that there is no clearance between the main bearing girder (1,
Fig. 2 ) and the main bearing cover (2).
6) Mark the position of the nuts (1, Fig. 4 ) on the bearing cover (1
st
Step).
1
ST
STEP 2
ND
STEP
y
x
4
013.432/05
009.758/02
y
TIGHTENING
ANGLE
x
Fig. 4
7) On the hydraulic unit (94942), increase the pressure to 1500 bar. Keep the
pressure constant.
8) Use the round bar (4, Fig. 3 ) to tighten fully all the nuts (3). Use the feeler gauge
(94122) to do a clearance check through the slot (5).
9) On the hydraulic unit (94942), decrease the pressure to zero.
10) Remove the double pre-tensioning jacks (94114B).
Note: Make sure that all the nuts are turned approximately i.e. the tightening
angle must be 20
°
between the 1
st
Step and 2
nd
Step, see Fig. 4 . If larger
differences occur, do step 1 ) to step 10 ) above again.
11) Use the special feeler gauge (94123) to do a check of the vertical clearance
(refer to 0330 − 1 Clearance Table, Crankshaft and Main Bearing’).
Note: All main bearing clearance values are applicable only with tightened tie
rods and waisted studs.
Main Bearing: Main Bearing: Waisted Studs − Loosen and Apply Tension
2016