Tools Required

J 25070  Heat Gun, or equivalent

Fig 1: View Of Connecting Rod
Courtesy of GENERAL MOTORS CORP.
1. Install 1 retaining clip (121).
2. Apply clean engine oil to the piston pin bore, piston pin, and connecting rod pin bore.
Fig 2: Using J 25070
Courtesy of GENERAL MOTORS CORP.
3. Use the J 25070  , or equivalent, in order to heat the piston to approximately 70°C (158°F).
Fig 3: View Of Piston Pin & Clip
Courtesy of GENERAL MOTORS CORP.
4. Assemble the piston and connecting rod with the alignment marks (1) on the same side.
5. Install the piston pin (119) and clip (121).
Fig 4: Removing/Installing Piston Rings
Courtesy of GENERAL MOTORS CORP.
6. Install the piston rings (122).
Fig 5: View Of Manufacturing Identification Marks
Courtesy of GENERAL MOTORS CORP.
7. The top compression ring (1) has a 1D identification mark. The second compression ring (2) has a 2C identification mark. The manufacturing identification marks must face the top of the piston.
Fig 6: Measuring Ring-To-Groove Clearance
Courtesy of GENERAL MOTORS CORP.
8. Using a feeler gage, measure the ring-to-groove clearance.

   Specification: 

   • Top compression ring clearance - new: 0.055-0.08 mm (0.0022-0.0031 in)
   • Top compression ring clearance - service limit: 0.15 mm (0.006 in)
   • Second compression ring clearance - new: 0.03-0.055 mm (0.0012-0.0022 in)
   • Second compression ring clearance - service limit: 0.13 mm (0.005 in)

Fig 7: View Of Piston Ring Installation Alignment
Courtesy of GENERAL MOTORS CORP.
9. Rotate the piston rings in order to position the end gaps. Do not position any ring gap at the piston thrust surface. Do not position any ring gap in line with the piston pin and pin bore.
   • Top compression ring (1)
   • Oil spacer ring (1)
   • Oil rings (2, 4)
   • Second compression ring (3)
   • Piston pin (5)