Piston, Connecting Rod, and Bearing Removal

Special Tools

• J 24270  Cylinder Bore Ridge Reamer
• J 41556  Connecting Rod Guide

For equivalent regional tools, refer to Special Tools .

Fig 1: Removing Cylinder Bore Ring Ridge
Courtesy of GENERAL MOTORS CORP.
1. Use the J 24270  ridge reamer in order to remove the cylinder bore ring ridge, if required.
   1. Turn the crankshaft until the piston is at the bottom of the stroke.
   2. Place a cloth on top of the piston.
   3. Use the J 24270  ridge reamer, or equivalent, in order to remove a cylinder ring ridge.
   4. Turn the crankshaft so the piston is at the top of the stroke.
   5. Remove the cloth.
   6. Remove the cutting debris from the cylinder and piston.
Fig 2: Marking Piston Connecting Rod
Courtesy of GENERAL MOTORS CORP.
2. Using a paint stick or etching tool, place matchmarks or numbers on the connecting rods and the connecting rod caps. The connecting rods and caps MUST be assembled to their original position and direction.
   • A stamping mark on the side of the connecting rod, at the crankshaft journal, may affect component geometry.
   • Mark the top of the piston to the specific cylinder bore.
Fig 3: Connecting Rod Bolt, Cap And Bearing
Courtesy of GENERAL MOTORS CORP.
IMPORTANT:

Mark, sort, or organize the connecting rod bearings so they may be installed to their original position and location. The connecting rods and the bearing caps are NOT interchangeable. Refer to Separating Parts .

3. Remove the connecting rod bolts (102), cap (103) and bearing (104).
Fig 4: Connecting Rod Assembly And Guide
Courtesy of GENERAL MOTORS CORP.
4. Install the J 41556  guide to the connecting rod.
Fig 5: Piston, Connecting Rod And Cylinder Bore
Courtesy of GENERAL MOTORS CORP.
5. Using a hammer, tap lightly on the end of the J 41556  guide in order to remove the piston and connecting rod assembly from the cylinder bore.
6. Remove the J 41556  guide.
Fig 6: Piston, Connecting Rod And Connecting Rod Bearing
Courtesy of GENERAL MOTORS CORP.
7. Upon removal of the piston and connecting rod assembly, assemble the connecting rod cap and bolts onto the matching connecting rod.