Piston: Testing and Inspection

Piston Pin Inner Diameter:

1. Measure inner diameter of piston pin hole "dp".
Standard: 20.987 - 20.999 mm (0.8263 - 0.8267 In)

2. Measure outer diameter of piston pin "Dp".
Standard: 20.989 - 21.001 mm (0.8263 - 0.8268 in)

3. Calculate interference fit of piston pin to piston.
dp - Dp: 0 - 0.004 mm (0 - 0.0002 In)

NOTE: If it exceeds the above value, replace piston assembly or pin.

Piston Ring Clearance:

4. Check piston ring side clearance.
Top ring: 0.04 - 0.08 mm (0.0016 - 0.0031 in)

2nd ring: 0.03 - 0.07 mm (0.0012 - 0.0028 in)

Max. limit of side clearance: 0.1 mm (0.004 in)

5. If out of specification, replace piston and/or piston ring assembly.