3.Calculate the cylinder-to-piston clearance from the cylinder bore diameter and the piston outer diameter.
• If the clearance exceeds the maximum specification, replace the piston or cylinder block.
Standard clearance between piston and cylinder
0.031—0.049 mm {0.0013—0.0019 in}
Maximum clearance between piston and cylinder
0.067 mm {0.0026 in}
4.Measure the piston-to-ring groove clearance along the perimeter using a feeler gauge. For the O-ring, measure the clearance with the O-ring assembled to the piston.
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• If the clearance exceeds the maximum specification, replace the piston or piston ring.
Standard clearance between piston ring and ring groove
Top: 0.10—0.14 mm {0.0040—0.0055 in}
Second: 0.05—0.09 mm {0.002—0.003 in}
Oil: 0.05—0.09 mm {0.002—0.003 in}
Maximum clearance between piston ring and ring groove