Diameter Check/Fitting

NOTE: Measure the piston outer diameter at a right angle (90 degrees) to the piston pin and below the oil ring groove.





1. Measure the outer diameter of each piston.
Coded Grade 1: 84.77-84.78 mm.
Coded Grade 2: 84.78-84.79 mm.
Coded Grade 3: 84.79-84.80 mm.
2. Measure the cylinder block piston bores 13 mm (1/2 inch) below the top of the deck.
3. Measure the cylinder block piston bores 13 mm (1/2 inch) above top of piston with piston at its lowest pint of travel in the cylinder block bore.
Grade 1: 84.80-84.81 mm.
Grade 2: 84.81-84.82 mm.
Grade 3: 84.82-84.83 mm.
4. The difference between the two is the piston to cylinder bore clearance.
Clearance Limit: 0.020-0.040 mm.
With Piston Coating: -0.010-0.030 mm.
5. Select a piston to keep clearance within range.