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1.Check the oscillation torque as shown in the figure. Verify that the large end drops under its own weight with no resistance.

• If the piston shakes heavily or unsmoothly, disassemble the piston and connecting rod, then inspect the following: (See PISTON PIN INSPECTION.)

― Clearance between piston pin outer diameter and piston pin hole diameter.

― Clearance between piston pin outer diameter and connecting rod small end inner diameter.

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