Piston, Engine

Piston Pin Sub-Assembly
Using a micrometer, measure the piston diameter at right angles to the piston pin center line, and at a position 27 mm (1.06 inch) from the top of the piston head.
Piston diameter 74.945 to 74.955 mm (2.9506 to 2.9510 inch)
Using a caliper gauge, measure the piston pin hole diameter of the piston.
Piston pin hole diameter at 20°C (68°F) 18.013 to 18.016 mm (0.7092 to 0.7093 inch)





Using a micrometer, measure the piston pin diameter.
Piston pin diameter 18.001 to 18.004 mm (0.7087 to 0.7088 inch)
Subtract the piston pin diameter measurement from the piston pin hole diameter measurement.
Standard oil clearance 0.009 to 0.015 mm (0.0004 to 0.0006 inch)
Maximum oil clearance 0.050 mm (0.0020 inch)

Piston Clearance
Subtract the piston diameter measurement from the cylinder bore diameter measurement.
Standard oil clearance 0.045 to 0.068 mm (0.0018 to 0.0027 inch)
Maximum oil clearance 0.08 mm (0.0032 inch)





Ring Groove Clearance
Using a feeler gauge, measure the clearance between a new piston ring and the wall of the ring groove.





Standard ring groove clearance





Piston Ring End Gap
Using a piston, push the piston ring a little beyond the bottom of the ring travel, 110 mm (4.33 inch) from the top of the cylinder block.





Standard end gap