Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual page 556

Piston Pin
• Check piston pin, connecting rod small end bore and piston
bore for wear or damage, paying particular attention to con-
dition of small end bore bush. If pin, connecting rod small
end bore or piston bore is badly worn or damaged, replace
pin, connecting rod or piston.
• 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.
Piston pin clearance in small end
Standard : 0.003 – 0.014 mm (0.0001 – 0.0005 in.)
Small-end bore
21.003 – 21.011 mm (0.8269 – 0.8272 in.)
Piston pin dia.
20.997 – 21.000 mm (0.8267 – 0.8267 in.)
Piston Rings
To measure end gap, insert piston ring (3) into cylinder bore and
then measure the gap by using thickness gauge (2).
If measured gap is out of specification, replace ring.
NOTE:
Clean carbon deposits and any other dirt from top of cyl-
inder bore before inserting piston ring.
Piston ring end gap
Standard
0.20 – 0.35 mm
Top ring
(0.0079 – 0.0137 in.)
0.35 – 0.50 mm
2nd ring
(0.0138 – 0.0196 in.)
0.20 – 0.70 mm
Oil ring
(0.0079 – 0.0275 in.)
1. Cylinder block
4. 120 mm (4.72 in.)
ENGINE MECHANICAL (J20 ENGINE) 6A4-67
Limit
0.7 mm
(0.0275 in.)
0.7 mm
(0.0275 in.)
1.8 mm
(0.0708 in.)