Man D 2842 LE 620, Repair Manual

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Removing and installing piston rings
123
Piston ring arrangement
Fig. 1
À
Compression ring (double − sided keystone ring)
Á
Compression ring (tapered compression ring)
Â
Oil scraper ring (bevelled − edge 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
grooves.
Note:
The coiled spring expanders mean that the
oil scraper 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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