Suzuki GF60A, Service Manual

Page: 155 / 336

Power Unit Mechanical: 1D-53
Identification of Oversize Piston / Piston Ring
One oversize piston / piston ring components, 0.50 mm
is available. Oversize piston / piston ring are marked as
shown, below.
Piston
1st and 2nd Piston ring
1st, 2nd ring
Oil ring
Oil ring spacer
Piston
Visual inspection
Inspect piston for faults, cracks or other damage.
Damaged or faulty piston(s) should be replaced.
Piston ring to groove clearance
Before checking, piston grooves must be clean, dry and
free of carbon.
Fit piston ring into piston groove, and measure clearance
between ring and ring groove using thickness gauge.
If measurement exceeds service limit, replace piston
and/or piston ring.
Special tool
(A): 09900–20803 (Thickness gauge)
Piston ring to groove clearance
Standard (1st): 0.030 – 0.070 mm (0.0012 – 0.0028 in.)
Standard (2nd): 0.020 – 0.060 mm (0.0008 – 0.0024
in.)
Service limit (1st): 0.12 mm (0.005 in.)
Service limit (2nd): 0.10 mm (0.004 in.)
Piston ring groove width
Standard (1st): 1.02 – 1.04 mm (0.040 – 0.041 in.)
Standard (2nd): 1.21 – 1.23 mm (0.048 – 0.048 in.)
Standard (Oil): 2.01 – 2.03 mm (0.079 – 0.080 in.)
Piston ring thickness
Standard (1st): 0.97 – 0.99 mm (0.038 – 0.039 in.)
Standard (2nd): 1.17 – 1.19 mm (0.046 – 0.047 in.)
Piston Ring
Piston ring end gap
Measure piston ring end gap with piston ring in the
lowest position of cylinder bore.
If measurement exceeds service limit, replace piston
ring.
Special tool
(A): 09900–20803 (Thickness gauge)
Oversize I.D. mark
0.50 mm 50
“A”: I.D. mark: 50
Oversize I.D. mark
0.50 mm 50
“B”: I.D. mark
Oversize I.D. mark
0.50 mm One Red paint
“C”: I.D. mark
“A”
I9J011140062-02
“B”
I9J011140063-03
“C”
I9J011140064-02
1. Piston ring
(A)
1
I9J011140065-03