POWER UNIT 6-33
Cylinder bore
Piston skirt diameter
74.000 – 74.020 mm
73.970 – 73.990 mm
(2.9134 – 2.9142 in)
(2.9122 – 2.9130 in)
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 the two positions. (Taper)
• Difference between the thrust and axial measurement. (Out-
of-round)
$
09900-20508: Cylinder gauge set
Service limit: 0.100 mm (0.0039 in)
If the measurement exceeds the service limit, rebore or replace
the cylinder.
Piston to cylinder clearance
Standard
: 0.020 – 0.040 mm (0.0008 – 0.0016 in)
Service limit: 0.100 mm (0.0039 in)
If the measurement exceeds the service limit, replace the pis-
ton and/or the cylinder or rebore the cylinder.
To check the clearance, measure the following items:
• Cylinder bore at 50 mm elevation from the gasketed surface
• Piston skirt diameter at 15 mm elevation from the skirt end
$
09900-20508: Cylinder gauge set
09900-20203: Micrometer
Standard:
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)
