POWER UNIT 6-27
Cylinder bore wear (difference)
Measure the cylinder bore in the thrust and axial directions at
the three positions A, B and C as shown.
Check for the followings:
• Difference of the measurements at three positions (Taper)
• Difference between the thrust and axial measurement.
(Out-of-round)
09900-20530: Cylinder gauge set
Service limit: 0.055 mm (0.0022 in)
If measurement exceeds service limit, rebore or replace cylin-
der.
Piston to cylinder clearance
Standard: 0.0276 – 0.0425 mm (0.0011 – 0.0017 in)
Service limit: 0.100 mm (0.0039 in)
If measurement exceeds service limit, replace the piston and/or
the cylinder or rebore the cylinder.
To check the clearance, measure the following items:
• Cylinder bore at 50 mm below the cylinder head gasket sur-
face
• Piston skirt diameter at a point 15 mm above the skirt end
09900-20530: Cylinder gauge set
09900-20203: Micrometer
Cylinder bore
Standard: 58.000 – 58.015 mm (2.2835 – 2.2841 in)
Piston skirt diameter
Standard: 57.965 – 57.980 mm (2.2821 – 2.2827 in)
NOTE:
For this check, measure the cylinder bore and the piston skirt
diameter in the direction that makes a right angle with the crank-
shaft (piston pin).
50 mm
(2.0 in)
15 mm
(0.6 in)
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