Suzuki 2006 SX4, Service Manual

Page: 280 / 1478

1D-49 Engine Mechanical:
NOTE
If any one of four cylinders has to be rebored,
rebore all four to the same next oversize.
This is necessary for the sake of uniformity
and balance.
Pistons
• Inspect piston for faults, cracks or other damages.
Damaged or faulty piston should be replaced.
• Piston diameter:
As indicated in figure, piston diameter should be
measured at a position 26.5 mm (1.04 in.) (“a”) from
piston skirt end in the direction perpendicular to piston
pin.
Piston diameter
• 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
0.02 – 0.04 mm (0.0008 – 0.0015 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.
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
1. 50 mm (1.96 in.) 2. 95 mm (3.74 in.)
Standard 83.9700 – 83.9900 mm
(3.3059 – 3.3067 in.)
Oversize: 0.50 mm
(0.0196 in.)
84.4700 – 84.4900 mm
(3.3256 – 3.3264 in.)
I5JB0A142046-01
I2RH01140157-01
Item Standard Limit
Top
ring
0.03 – 0.07 mm
(0.0120 – 0.0027 in.)
0.12 mm (0.0047 in.)
2nd
ring
0.02 – 0.06 mm
(0.0008 – 0.0023 in.)
0.1 mm (0.0039 in.)
Oil ring
0.06 – 0.15 mm
(0.0024 – 0.0059 in.)
—
I2RH01140159-01