Suzuki GRAND VITARA XL-7 Owner's Manual page 310

• Piston clearance :
Measure cylinder bore diameter and piston diameter to find
their difference which is piston clearance. Piston clearance
should be within specification as given below. 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 2 positions.
1. 26.5 mm (1.04 in.)
• 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 clear-
ance between ring and ring land by using thickness gauge
(2). If clearance is out of specification, replace piston.
Ring groove clearance :
Top : 0.03 – 0.07 mm (0.0012 – 0.0027 in.)
2nd : 0.02 – 0.06 mm (0.0008 – 0.0023 in.)
ENGINE MECHANICAL (H27 ENGINE) 6A2-23