Suzuki 2000 Grand Vitara SQ625 Service Manual page 479

6A4-60 ENGINE MECHANICAL (J20 ENGINE)
D 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, re-
bore 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.
1. 26.5 mm (1.04 in.)
D Ring groove clearance:
Before checking, piston grooves must be clean, dry and free of
carbon deposits.
Fit new piston ring into piston groove, and measure clearance be-
tween ring and ring land by using thickness gauge. If clearance
is out of specification, replace piston.
Ring groove clearance:
Top: 0.03 – 0.07 mm (0.0012 – 0.0027 in.)
1. Piston ring
2. Thickness gauge
2nd: 0.02 – 0.06 mm (0.0008 – 0.0023 in.)
Piston Pin
D Check piston pin, connecting rod small end bore and piston bore
for wear or damage, paying particular attention to condition of
small end bore bush. If pin, connecting rod small end bore or pis-
ton bore is badly worn or damaged, replace pin, connecting rod
or piston.
D Piston pin clearance:
Check piston pin clearance in small end. Replace connecting rod
if its small end is badly worn or damaged or if measured clearance
exceeds limit.
Small-end bore:
21.003 – 21.011 mm (0.8269 – 0.8272 in.)
Piston pin dia.:
20.997 – 21.000 mm (0.8267 – 0.8268 in.)
Item
Piston clearance in
small end
Standard
0.003 – 0.014 mm
(0.0001 – 0.0005 in.)