Out-of-Round and Taper

12M0732

A Measure twice at middle
B Measure taper rear edges

Out-of-Round and Taper

• Measure out-of-round at the middle of each rod and main journal in two places (A).
• The difference between measurements on each journal must not be more than the service limit.

Journal Out-of-Round:
Standard (New): 0.005 mm
Service Limit: 0.006 mm

• Measure taper at the edge of each rod and main journal (B).
• The difference between measurements on each journal must not be more than the service limit.

Journal Taper:
Standard (New): 0.005 mm max.
Service Limit: 0.006 mm

PISTONS

Inspection

1. Check the piston for distortion or cracks.

Note: If the cylinder is bored, an oversized piston must be used.

12M0733

A Skirt Diameter

2. Measure the piston diameter at a point: 21 mm from the bottom of the skirt.

Note: There are two standard-size pistons (No Letter (A) or B). The letter is stamped on the top of the piston. These letters are also stamped on the block as cylinder bore sizes.

Piston Diameter:
Standard (New):
No Letter (A): 84.980 – 84.990 mm
B: 84.970 – 84.980 mm
Service Limit:
No Letter (A): 84.970 mm
B: 84.960 mm