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•
Clean the piston ring groove.
7.9.3 To examine the cylinder
•
Make sure that the surface layer of the cylinder is
not worn, especially in the top end of the cylinder.
•
Make sure that the cylinder does not have score
marks.
7.9.4 To examine the piston
•
Make sure that the piston ring can move freely in the
groove.
•
Examine the surface of the piston for damage and
wear.
•
Examine the piston pin. Refer to
piston pin on page 37 .
•
Examine the snap rings. If the snap rings have
cracks or discoloration, replace them.
•
Measure the piston ring groove (A). Replace the
piston if the groove is larger than 1.6 mm.
935 - 001 -
To examine the
B
A
•
Measure the piston ring play (B). Replace the piston
ring if the piston ring play is larger than 0.15 mm.
•
Put the piston ring in the cylinder and measure the
space with an air gap tool. The space must not be
more than 1 mm.
7.9.4.1 To examine the piston pin
•
Make sure that the piston pin bearing is not
damaged.
•
Make sure that the piston pin does not have
discolorations.
•
Make sure that the piston pin does not have
damages on the surface against the bearing.
•
If the piston moves too easily, replace the piston and
the piston pin.
•
Make sure that the needle bearing does not have
discolorations or damages.
Repair instructions- 37
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