Diameter/Clearance

1. Inspect the outer circumferences of all pistons for seizure or scoring. Replace if necessary.





2. Measure the outer diameter of each piston at a right angle 90° to the piston pin, 22 mm (0.866 in) below the oil ring groove lower edge.

Piston diameter:
Standard:
89.958-89.990 mm (3.5417-3.5429 inch)
0.25 mm (0.01 in) oversize:
90.208-90.240 mm (3.5515-3.5527 inch)
0.50 mm (0.02 in) oversize:
90.458-90.490 mm (3.5614-3.5625 inch)





3. Measure the piston-to-cylinder clearance.
Clearance: 0.02-0.051 mm (0.0010-0.0020 in)
Maximum: 0.15 mm (0.006 in)

4. If the clearance exceeds the maximum, replace the piston or rebore the cylinders to fit oversize pistons.
5. If the piston is replaced, the piston rings must also be replaced.