GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Tools Required

    • J 5239 Connecting Rod Bolt Guide Set
    • J 24270 Cylinder Bore Ridge Reamer
  1. Remove the cylinder head(s). Refer to Cylinder Head Replacement .
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Remove the oil pan. Refer to Oil Pan Replacement .
  4. Remove the oil pump. Refer to Oil Pump Removal .
  5. Remove the crankshaft oil deflector. Refer to Crankshaft Oil Deflector Replacement .
  6. Rotate the crankshaft until the piston and rod assembly to be serviced is at Bottom Dead Center (BDC).
  7. Important: Make identification marks on the connecting rods and the corresponding connecting rod caps.

  8. Remove the piston, the connecting rod and the connecting rod bearing. Refer to Piston, Connecting Rod, and Bearing Removal .
  9. Lower the vehicle.
  10. Inspect the piston. Refer to Piston, Connecting Rod, and Bearings Clean and Inspect .
  11. Inspect the connecting rod bearings. Refer to Piston, Connecting Rod, and Bearings Clean and Inspect .
  12. Inspect the connecting rod cap and connecting rod. Refer to Piston, Connecting Rod, and Bearings Clean and Inspect .
  13. Inspect the crankshaft connecting rod journal. Refer to Crankshaft and Bearings Clean and Inspect .
  14. Hone the cylinder bore.
  15. Clean the cylinder bores with hot water and detergent.
  16. Dry the cylinder bores with a clean, dry cloth.
  17. Use a clean dry cloth in order to swab the cylinder bores with NEW engine oil.

Installation Procedure

  1. Install the piston into its original bore. Refer to Piston, Connecting Rod, and Bearing Installation .
  2. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Install the crankshaft oil deflector. Refer to Crankshaft Oil Deflector Replacement .
  4. Install the oil pump. Refer to Oil Pump Installation .
  5. Install the oil pan. Refer to Oil Pan Replacement .
  6. Lower the vehicle.
  7. Install the cylinder head(s). Refer to Cylinder Head Replacement .