WÄRTSILÄ VASA 6L32, Instruction Manual

Page: 174 / 394

18 Apply the sleeve and hydraulic cylinder
onto main
bearing screw (B
2
) by the same procedure.
19 Tighten the nuts of the main bearing screws
as de-
scribed in adjacent figure. Both screws must be tightened at
the same time and in two steps, see Fig 10-1. Turn the nuts
using the pin 800049.
Note! The hydraulic pressure in the tool must keep stable when
tightening the nuts.
20 Connect the hydraulic pump and hose
to the tool on
the already pretightened side screw (A
2
), see Fig 10-1.
21 Rise the pressure in the hydraulic tool
to 250 bar and
turn the nut to contact with the pin 800043.
22 Mount the distance sleeve 800042
and the hydraulic
tool 800041 in position on the opposite side screw (A
1
), see Fig
10-1.
23 Rise the pressure in the hydraulic tool
to 250 bar and
turn the nut (A1) to contact.
24 Tighten the side screw (A
2
)
to full stated pressure.
25 Tighten the side screw (A
1
)
to full stated pressure.
26 Remove the tools,
mount the main bearing temperature
sensor, the cable clamps and the crankcase covers.
10.5 Cylinder liner
10.5.1 Maintenance of cylinder liner
Data and dimensions
Material: Special grey
cast
Weight: 238 kg
a) Honing of cylinder liner bore
Always hone the cylinder liner when new piston rings are
mounted. Normally a light honing is sufficient. If the honing
is done when the cylinder liner is on its place in the engine
block, the crankshaft under the cylinder liner concerned must
be covered by plastic film. Honing rests must be prevented from
falling into the oil sump of the engine. For the honing process
the following instructions are prescribed:
••••
The honing is to be carried out by means of Plateau honing.
••••
Only ceramic hones with a coarseness of 80 and 400 should
be used. The hones with a coarseness of 80 should be used
for about 20 strokes or until the polished areas in the cylinder
liner are over scraping. The hones with a coarseness of 400
should be used for about 30 strokes to give the correct surface
finish.
Hydraulic oil
REASSEMBLY
1. Mount the nuts, the distance
sleeves and the cylinders.
2. Connect the hoses, open the
pressure release valve.
Tighten the cylinders to expel
oil out of these.
3. Close the valve and pump
pressure to stated value for
step 1.
4. Turn the nuts until close
contact is reached.
5. Release the pressure by
opening the valve.
6. Close the valve and pump
pressure to the full stated value.
7. Turn the nuts until close
contact is reached.
8. Open the valve and remove
the tool set.
10 Engine Block with Bearings, Oil Sump and Cylinder Liner 32-200150
10 - 10 WÄRTSILÄ 32/34SG