Man D 2840 LE 301, Repair Manual

Page: 128 / 194

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Removing and installing piston rings
126
Piston ring arrangement
Fig. 1
1 Compression ring (keystone ring)
2 Compression ring (minute ring)
3 Oil control ring (bevelled ring)
Removing piston rings
Fig. 2
Remove pistons with conrods
Fit conrod in a vice, use protective jaws.
Set piston ring wrench to piston diameter.
Fig. 3
Apply piston ring wrench to piston ring joint and
disengage the piston ring from the piston ring groo-
ves.
Note:
The coiled spring expanders mean that the
oil control ring has greater tangential ten-
sion.
Carefully clean the piston ring grooves using saw-
dust. Do not damage the piston ring grooves.
Checking ring end clearance
Fig. 4
Insert the piston rings individually in the cylinders
and use a feeler gauge to determine the ring end
clearance.
If the ring end clearance is too great, replace the
piston rings.
Ring end clearance, see “Service Data”.
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