Suzuki Liana RH418, Supplementary Service Manual

Page: 175 / 371

Engine Mechanical: 1D-49
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: 82.969 – 82.984 mm (3.2665 –
3.2670 in.)
Oversize (0.50 mm (0.0196 in.): 83.469 – 83.484
mm (3.2862 – 3.2867 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: 0.016 – 0.045 mm (0.0007 – 0.0017 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”: 19.5 mm (0.77 in.)
“a”: 19.5 mm (0.77 in.)
I2RH01140157-01
I3RH0A140015-01
Standard Limit
Top ring
0.03 – 0.07 mm
(0.0012 – 0.0027 in.)
0.12 mm (0.0047 in.)
2nd ring
0.02 – 0.06 mm
(0.0008 – 0.0023 in.)
0.10 mm (0.0039 in.)
Oil ring
0.06 – 0.13 mm
(0.0024 – 0.0051 in.)
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I2RH01140159-01