56
Repair instructions
4
Press the gudgeon pin in carefully with mandrel no.
992071 and install the second circlip.
NOTE! It should be possible to press the gudgeon pin
in easily, it must not be driven in with a hammer.
Inspection and fit of piston
rings
Checking the piston ring gap
Check the wear surfaces and sides. Black spots on
the surface indicate poor contact, and mean that the
piston ring must be replaced.
Oil consumption also has a considerable bearing on
when piston rings should be replaced.
Check the piston ring gap (please refer to the illustra-
tion above).
During measurement, the ring should be pressed down
below the Bottom Turning point using a piston.
Replace the piston rings if the gap is 1.5 mm or great-
er.
In general, piston rings should be replaced if there is
any noticeable wear (within the wear tolerances) in the
cylinders, since the piston rings do not normally end
up in the same positions as they had before removal.
Check the piston ring gap on new piston rings as well.
Please refer to “Technical Data” in the Workshop Man-
ual for measurements for each engine variant.
Note. New cylinder liners are supplied complete with
pistons and piston rings.
Piston rings, assembly
Install the piston rings on the piston by means of pis-
ton ring pliers.
The oil scraper ring must be installed first, and can be
installed either way up. The expansion spring gap
should be located on the opposite side to the oil
scraper ring gap.*
The compression rings are marked; (the TOP, TOPCD
TOPCX or machined mark) should be at the top.
For a further description of the various versions and
installation locations, please refer to the “Piston ring”
heading on pages 26 and 27.
* White paint marks on the spring should be visible through the
ring gap.
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