Suzuki GF60A - Page 154

1D-52 Power Unit Mechanical:
Cylinder Bore Wear (Difference)
Using telescoping gauge (1), measure cylinder bore in
both axial (vertical line, following crankshaft) and
transverse (horizontal line across crankshaft) directions
at two positions as shown in figure.
NOTE
Purchase a commercially available
telescoping gauge for this measurement.
Check the following:
• Difference between measurements at the two
positions (taper).
• Difference between axial and transverse
measurement (out-of-round).
If measurement exceeds service limit, bore or replace
cylinder.
Cylinder bore wear (difference)
Service limit: 0.10 mm (0.0039 in.)
Piston to Cylinder Clearance
1) Measure the piston diameter at a point 8 mm (0.315
in.) above the piston skirt at a right angle to the
piston pin bore.
Special tool
(A): 09900–20203 (Micrometer (50 – 75
mm))
Piston skirt diameter
Standard: 72.470 – 72.490 mm (2.8531 – 2.8539
in.)
2) Measure the cylinder bore at 50 mm (1.969 in.)
below the cylinder head gasket surface at a right
angle to the crankshaft pin.
NOTE
Purchase a commercially available
telescoping gauge (1) for this measurement.
Cylinder bore diameter
Standard: 72.500 – 72.520 mm (2.8543 – 2.8551
in.)
3) Calculate the piston / cylinder clearance (Clearance
equals difference between piston diameter and
cylinder bore measurements).
If clearance exceeds service limit, replace piston
and/or cylinder or bore cylinder.
Piston to cylinder clearance
Standard: 0.020 – 0.040 mm (0.0008 – 0.0016 in.)
Service limit: 0.100 mm (0.0039 in.)
“a”: 50 mm (1.96 in) “b”: 90 mm (3.54 in)
1
IAJ6 11140211-01
“a”
“b”
I9J011140060-01
“a”: 8 mm
“a”
(A)
I9J011140061-02
50 mm
1
IAJ611140212-01