Suzuki Engine 2002 GRAND VITARA SQ625, Руководство по обслуживанию

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6A4-66 ENGINE MECHANICAL (J20 ENGINE)
Pistons
• Inspect piston for faults, cracks or other damages.
Damaged or faulty piston should be replaced.
• Piston diameter :
As indicated in figure, piston diameter should be measured
at a position 26.5 mm (1.04 in.) from piston skirt end in the
direction perpendicular to piston pin.
Piston diameter
Standard Piston diameter:
83.970 – 83.990 mm (3.3059 – 3.3066 in.)
Oversize (0.50 mm (0.0196 in.)) piston diameter:
84.470 – 84.490 mm (3.3256 – 3.3263 in.)
• 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.)
• Ring groove clearance :
Before checking, piston grooves must be clean, dry and free
of carbon deposits.
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.)
1. 26.5 mm (1.04 in.)
NOTE:
Cylinder bore diameters used here are measured in
thrust direction at two positions.
1. 26.5 mm (1.04 in.)