Piston and Connecting Rod Disassemble

WARNING: This page is about a different variant/trim than selected.

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

Fig 1: Detaching Piston From Connecting Rod
Courtesy of GENERAL MOTORS COMPANY

NOTE: Note installation position of the piston in respect of the connection rod.
Remove the retainer (1) from the piston eye.
NOTE: Do not damage the bore.
Press the piston pin out of the piston.
Remove the piston rings, using piston ring pliers (1).

Fig 2: Removing Piston Rings Using Piston Ring Pliers
Courtesy of GENERAL MOTORS COMPANY

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

Fig 3: Rectangular Compression Ring, Tapered Compression Ring And Oil Scraper Ring
Courtesy of GENERAL MOTORS COMPANY
- 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)
Check piston ring vertical play with a feeler gauge (1) in the piston ring groove.

Fig 4: Checking Piston Ring Vertical Play With Feeler Gauge
Courtesy of GENERAL MOTORS COMPANY

Fig 5: Rectangular Compression Ring, Tapered Compression Ring And Oil Scraper Ring
Courtesy of GENERAL MOTORS COMPANY

Permissible vertical play:
- 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)