Piston Pins

Measure the diameter of the piston pin.
Piston pin diameter

23.002 ~ 23.006 mm (0.9056 ~ 0.9057 in.)

Fig 1: Measuring Outer Diameter Of Piston Pin
Courtesy of HYUNDAI MOTOR CO.
Measure the piston pin-to-piston clearance.
Piston pin-to-piston clearance

0.01 ~ 0.02 mm (0.0004 ~ 0.0008 in.)
Check the difference between the piston pin diameter and the connecting rod small end diameter.
Piston pin-to-connecting rod interference

-0.032 ~ -0.016 mm (-0.00126 ~ -0.00063 in.)