Piston, Engine

Piston Diameter
Using a micrometer, measure the piston diameter at right angles to the piston pin center line, 27.7 mm (1.091 inch) from the piston head.
Piston diameter 93.910 to 93.920 mm (3.6972 to 3.6976 inch)

Piston Oil Clearance
Subtract the piston diameter measurement from the cylinder bore diameter measurement.
Standard oil clearance 0.080 to 0.102 mm (0.0031 to 0.0040 inch)
Maximum oil clearance 0.13 mm (0.0051 inch)
If the oil clearance is greater than the maximum, replace all the 6 pistons.





Piston Groove Clearance
Ring groove clearance:
No.1 0.02 to 0.07 mm (0.0008 to 0.0028 inch)
No.2 0.02 to 0.06 mm (0.0008 to 0.0024 inch)
Oil 0.07 to 0.15 mm (0.0028 to 0.0060 inch)





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:
No.1 0.30 to 0.40 mm (0.0118 to 0.0157 inch)
No.2 0.40 to 0.50 mm (0.0157 to 0.0197 inch)
Oil (Side rail) 0.10 to 0.40 mm (0.0039 to 0.0157 inch)
Maximum end gap:
No.1 1.0 mm (0.039 inch)
No.2 1.1 mm (0.043 inch)
Oil (Side rail) 1.0 mm (0.039 inch)

Piston Pin Oil Clearance





Piston pin hole inside diameter 22.001 to 22.010 mm (0.8662 to 0.8665 inch)





Piston pin diameter 21.997 to 22.006 mm (0.8660 to 0.8664 inch)





Bushing inside diameter 22.005 to 22.014 mm (0.8663 to 0.8667 inch)

Subtract the piston pin diameter measurement from the piston pin hole diameter measurement.
Standard oil clearance 0.001 to 0.007 mm (0.00004 to 0.00028 inch)
Maximum oil clearance 0.040 mm (0.0016 inch)





Subtract the piston pin diameter measurement from the bushing inside diameter measurement.
Standard oil clearance 0.005 to 0.011 mm (0.0002 to 0.0004 inch)
Maximum oil clearance 0.050 mm (0.0020 inch)