GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Tools Required

  1. J 36660-A Torque Angle Meter
  2. J 41507 Connecting Rod Assembly Guide
  1. Remove the cylinder head. Refer to Cylinder Head Replacement or Cylinder Head Replacement .
  2. Remove the oil pan. Refer to Oil Pan Replacement .

  3. Object Number: 38180  Size: SH
  4. Mark the piston with the number of the cylinder from which it is being removed.
  5. Mark the connecting rod and the rod cap so that they can be assembled correctly.
  6. Turn the crankshaft to bottom dead center.
  7. Clean the carbon from the top end of the cylinder.
  8. Remove the connecting rod bolts.
  9. Remove the connecting rod cap.
  10. Notice: If there is a pronounced ridge at the top of the piston travel, the ridge must be removed with a ridge reamer before the piston and connecting rod assembly are removed. Applying force may break the piston rings or damage the piston.

  11. Install the J 41507 on the connecting rod.
  12. Caution: Handle the piston carefully. Worn piston rings are sharp and may cause bodily injury.

    Important: Do not use force when removing the connecting rod and piston. Avoid breaking the piston rings and damaging the piston.

  13. Remove the connecting rod and piston. Push out with a suitable tool.

Installation Procedure


    Object Number: 38180  Size: SH
  1. Install the piston rings to the piston. The ring gaps must be staggered in order to provide an effective compression seal.
  2. Turn the crankshaft to bottom dead center.
  3. Lubricate the cylinder with oil.
  4. Install the connecting rod bearing.
  5. Install the J 41507 on the connecting rod.
  6. Align the piston and the connecting rod with the ridges toward the front of the engine.
  7. Notice: Guide the lower connecting rod end carefully to avoid damaging the crankshaft journal.

  8. Install the piston and connecting rod using a ring compressor.
  9. Notice: Do not scrape, shim, or file bearing inserts. If the bearing surface of the insert is touched with bare fingers, the skin oil and acids will etch the bearing surface.

    Notice: Upper and lower inserts may be different. Do not obstruct any oil passages.

    Important: Ensure that the bearing cap bolt holes and the cap mating surfaces are clean and dry. The inserts will project slightly when put into place. Ensure that they project an equal distance on both sides. Ensure that the insert tangs are engaged.

  10. Install the bearing inserts to a clean and dry connecting rod and cap.
  11. Measure the rod bearing clearance. If the readings are within limits, select a suitable set of inserts. If the readings are unsatisfactory and available inserts will not correct the clearance, the crankshaft must be replaced.
  12. Lubricate the bearing surfaces and the crankshaft journal surfaces with clean engine oil.
  13. Remove the J 41507 .
  14. Important: Carefully tap the bearing cap into place. Do not pull the cap down with the cap bolts.

  15. Install the connecting rod cap.
  16. Install the connecting rod cap bolts.
  17. Tighten
    Tighten the bolts to 27 N·m (20 lb ft). Use the J 36660-A in order to rotate the bolts an additional 50°.

  18. Pry the connecting rod back and forth with a suitable tool and check for binding. If necessary, loosen and retighten the bearing cap.

  19. Object Number: 35206  Size: SH
  20. Measure the connecting rod side clearance.
  21. Install the oil pan. Refer to Oil Pan Replacement .
  22. Install the cylinder head. Refer to Cylinder Head Replacement or Cylinder Head Replacement .