WÄRTSILÄ VASA 6L32, Instruction Manual

Page: 187 / 394

24 Pull lower part of the big end bearing cap out of the
crankcase, by using the sledge. Take care not to damage the
crank pin. Support the lower half sideways and don’t drop it.
25 Pull the upper part of the big end bearing cap out of
the crankcase rear side of the engine, by using the sledge.
Support the upper half sideways and don’t drop it.
Note! Take care not to damage the crank pin or the threads of the
studs.
26 Remove the mounting flute.
27 Cover the crank pin and oil holes
with clean plastic
and tape.
28 For mounting, see section 11.3.5.
11.3.4 Maintenance of piston, rings and connecting
rod bearings
1 Remove the securing ring (7) from the gudgeon pin hole
in the piston, on the side where the gudgeon pin drawing
number is located, by using the pliers 800002.
Note! Never compress the securing ring more than necessary to
remove it from the groove.
2 Drive out the gudgeon pin from the opposite side. In low
temperatures the gudgeon pin may stick but will be easily
removed after heating the piston to about 30°C.
3 If the rings and grooves require cleaning, measuring
etc., remove the piston rings by using the pliers 320D12/6-S7/8.
Before removing, note the positions of the rings to ensure mounting
in the same grooves. The design of the pliers prevents overstressing
of the rings. Using other means may overstress the rings.
4 Clean all the parts carefully. Remove the piston rings,
and remove burned carbon deposits from the piston and piston
ring grooves e.g. by using an old piston ring. Special care
should be taken not to damage the piston material. Never use
emery cloth on the piston skirt.
The cleaning is facilitated if coked parts are soaked in kero-
sene or fuel oil. An efficient carbon solvent — e.g. ARDROX
No. 668 or similar — should preferably be used to facilitate
cleaning of the piston crown. When using chemical cleaning
agents, take care not to clean piston skirt with such agents
because the phosphate/graphite overlay may be damaged.
32-200020 Crank Mechanism: Crankshaft, Connecting Rod, Piston 11
WÄRTSILÄ 32 11 - 9