G643 (E) Service Manual Chapter 3. Engine Mechanical System 77
Figure 12-30 Removing Piston Rings
4. Piston.
• Ring land for cracking, wear, etc.
• Ring grooves for burrs, nicks, etc.
• Skirts and pin bosses for cracking.
• Skirts for scuffing.
5. Connecting rod bearing inserts for scratches or
deep pitting.
Figure 12-31 Removing Piston Pin
Measuring Piston Pin-To-Piston
Clearance
Figures 12-32 and 12-33
Measure
1. Piston pin diameter. Check against
“Specifications.”
2. Piston pin-to-piston clearance.
A. Measure the piston pin hole diameter.
B. Subtract the piston pin diameter from the
piston pin hole diameter to obtain the
clearance.
C. Replace the piston and piston pin if the
clearance exceeds specifications. The piston
and piston pin are a matched set and not
available separately.
Figure 12-32 Measuring Piston Pin Diameter
Figure 12-33 Measuring Piston Pin Bore Diameter
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