Piston, Engine

Inspect W/Pin Piston Sub-Assy
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)m

Piston Oil Clearance
Standard oil clearance 0.045 to 0.068 mm (0.0018 to 0.0027 inch)
Maximum oil clearance 0.08 mm (0.0032 inch)
If the oil clearance is greater than maximum, replace all 4 pistons. If necessary, replace the cylinder block.






Piston Pin Oil Clearance
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)
If the clearance is greater than maximum, replace the bushing.
If necessary, replace both the piston and piston pin together.

Piston Ring Groove Clearance





Standard ring groove clearance
If the clearance is not as specified, replace the piston.





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.





Using a feeler gauge, measure the end gap.





Standard end gap