Suzuki Engine 2002 GRAND VITARA SQ625, Service Manual

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6A1-56 ENGINE MECHANICAL (G16 ENGINE)
3) 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.)
4) 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.)
Piston Pin
1) 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.
2) 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 clearance in small end
Standard : 0.003 – 0.016 mm (0.0001 – 0.0006 in.)
Limit : 0.05 mm (0.0020 in.)
Connecting rod small-end bore
19.003 – 19.011 mm (0.7482 – 0.7484 in.)
Piston pin dia.
18.995 – 19.000 mm (0.7478 – 0.7480 in.)
NOTE:
Cylinder bore diameters used here are measured in
thrust direction at two positions.
1. 23 mm (0.91 in.)