Suzuki Liana RH413, Service Manual

Page: 244 / 1302

1D-39 Engine Mechanical:
Pistons
• Inspect piston for faults, cracks or damage.
Damaged or faulty piston should be replaced.
• Piston diameter:
As indicated in the figure, piston diameter should be
measured at a position “a” from piston skirt end in the
direction perpendicular to piston pin.
Piston diameter specification
Standard size: 77.953 – 77.968 mm (3.0690 –
3.0696 in.)
Standard size (new one (with coating)): 77.969 –
77.984 mm (3.0696 – 3.0702 in.)
Oversize (0.50 mm (0.0196 in.): 78.453 – 78.468
mm (3.0887 – 3.0893 in.)
• Piston clearance:
Measure cylinder bore diameter and piston diameter
to find their difference which is piston clearance.
Piston clearance should be within specification as
follows. If it is out of specification, rebore cylinder and
use oversize piston.
Piston clearance
Standard: 0.032 – 0.061 mm (0.0013 – 0.0024 in.)
Standard (piston with coating (new one)): 0.016 –
0.045 mm (0.0006 – 0.0018 in.)
Limit: 0.161 mm (0.0065 in.)
NOTE
Cylinder bore diameters used here are
measured in thrust direction at two positions.
• Ring groove clearance:
Before checking, piston grooves must be clean, dry
and free of carbon deposits.
Fit new piston ring (1) into piston groove, and
measure clearance between ring and ring land by
using thickness gauge (2).
If clearance is out of specification, replace piston.
Ring groove clearance
“a”: 50 mm (1.96 in.)
“b”: 95 mm (3.74 in.)
“a”: 19.5 mm (0.77 in.)
I2RH0B140117-01
I2RH01140157-01
“a”: 19.5 mm (0.77 in.)
Standard Limit
Top ring 0.03 – 0.07 mm
(0.0012 – 0.0028 in.)
0.12 mm (0.0047 in.)
2nd ring 0.02 – 0.06 mm
(0.0008 – 0.0024 in.)
0.10 mm (0.0039 in.)
Oil ring 0.03 – 0.17 mm
(0.0012 – 0.0067 in.) —
I3RH0A140015-01
I2RH01140159-01