Chevrolet Sonic Repair Manual: Piston and Connecting Rod Disassemble

1. Remove the piston with connection rod. Refer to Piston, Connecting Rod, and Bearing Removal.




Note:

Note installation position of the piston in respect of the connection rod.

2. Detach the piston from the connection rod.

Note:

Do not damage the bore.

3. Remove the retainer (1) from the piston eye.
4. Press the piston pin out of the piston.


5. Remove the piston rings, using piston ring pliers (1).

   Remove oil carbon from the groove with a split piston ring, filed to a wedge-shape.



6. Measure the piston ring gap.

• Tension the piston ring in the cylinder and measure the gap with a feeler gauge.
• Permissible ring gap:
• Rectangular compression ring (1): 0.20-0.40 mm (0.007-0.015 in)
• Tapered compression ring (2): 0.40-0.60 mm (0.015-0.023 in)
• Oil scraper ring (3): 0.25-0.75 mm (0.009-0.029 in)

• Rectangular compression ring (1): 0.04-0.08 mm (0.001-0.003 in)
• Tapered compression ring (2): 0.03-0.07 mm (0.001-0.002 in)
• Oil scraper ring (3): 0.03-0.13 mm (0.001-0.005 in)