Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual page 554

• Force piston pin out.
CLEANING
Clean carbon deposits from piston head and ring grooves, using a
suitable tool.
INSPECTION
Cylinder
• Inspect cylinder walls for scratches, roughness, or ridges
which indicate excessive wear. If cylinder bore is very rough
or deeply scratched, or ridged, rebore cylinder and use over
size piston.
• Using a cylinder gauge, measure cylinder bore in thrust and
axial directions at two positions as shown in figure.
If any of the following conditions is noted, rebore cylinder.
a) Cylinder bore dia. exceeds limit.
b) Difference of measurements at two positions exceeds taper
limit.
c) Difference between thrust and axial measurements
exceeds out-of-round limit.
Cylinder bore dia. limit
84.050 mm (3.3090 in.)
Cylinder bore taper
Limit: 0.10 mm (0.0039 in.)
Cylinder bore out-of-round
Limit: 0.10 mm (0.0039 in.)
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.
1. 50 mm (1.96 in.)
2. 95 mm (3.74 in.)
ENGINE MECHANICAL (J20 ENGINE) 6A4-65