WÄRTSILÄ Vasa R22, Instruction Manual

Page: 133 / 297

clearance of the rings in their grooves, see chapter 06., section
06.2, pos. 11.
Especially the two chromium-plated topmost piston rings
should be examined. If the chromium-plating is worn through,
the ring should immediately be replaced by a new one.
Note! If the cylinder liner is new or honed, all rings are to be replaced
by new ones.
2 Check the end plugs of the gudgeon pins.
3 Check the gudgeon pin and big end bearing clear-
ances (chapter 06., section 06.2, pos. 11) at intervals accord-
ing to chapter 04. They will easily be checked by measuring the
pins and bearing separately (the big end bearing being tight-
ened to full torque). When using a feeler gauge the gauge
should be formed of as many thin blades as possible; if using
thick blades the overlay plating of the bearing may be dam-
aged.
4 Check that the serration of the connecting rod is not dam-
aged.
11.2.4 Installing the connecting rod and piston
1 Check that the bores for the skirt lubrication are not
blocked.
2 The gudgeon pins (5) should always be inserted from
the same side of the piston from which they have been removed
and should be placed the same way around, see section 11.2.2
pos.12. If the piston temperature is lower than +18 - 19
°
C the
gudgeon pin may stick but will move freely if the piston is
heated in oil to about 30°C. Oil the pin with lubricating oil
before installing, Fig 11-2.
3 Never compress the retainer ring (4) more than barely
to be able to fit it in the groove. If the ring is loose in the groove
after installation it should be replaced.
4 When mounting the piston in the connecting rod, see that
the cylinder number has stamped on the piston crown and the
connecting rod are on the same side. When changing a piston,
mark the new piston with the same number as the replaced
one. The arrow on the piston head should point to the camshaft
side.
22-9601 Crank Mechanism 11
VASA 22 11 - 7