Suzuki Engine 2002 GRAND VITARA SQ625, Service Manual

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ENGINE MECHANICAL (G16 ENGINE) 6A1-55
CLEANING
Clean carbon from piston head and ring grooves using a suitable
tool.
INSPECTION
Cylinders
1) 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.
2) Using a cylinder gauge, measure cylinder bore in thrust and
axial directions at two positions as shown in figure.
If any of following conditions is noted, rebore cylinder.
• Cylinder bore diameter exceeds limit.
• Difference of measurements at two positions exceeds taper
limit.
• Difference between thrust and axial measurements exceeds
out-of-round limit.
Cylinder bore diameter limit
75.15 mm (2.9586 in.)
Cylinder bore taper
Limit : 0.10 mm (0.0039 in.)
Cylinder bore out-of-round
Limit : 0.10 mm (0.0039 in.)
Pistons
1) Inspect piston for faults, cracks or other damaged.
Damaged or faulty piston should be replaced.
2) Piston diameter :
As indicated in figure, piston diameter should be measured
at a position 23 mm (0.91 in.) (1) from piston skirt end in the
direction perpendicular to piston pin.
Piston diameter
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.)
Piston size Piston diameter
Standard
74.970 – 74.990 mm
(2.9516 – 2.9523 in.)
Over size :
0.50 mm
(0.0196 in.)
75.470 – 75.480 mm
(2.9713 – 2.9716 in.)