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: Matchmarks On Connecting Rods & Caps
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 & 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: Installing Piston & Connecting Rod Assembly
Courtesy of GENERAL MOTORS CORP.
4. Install the J 41556:  guide to the connecting rod.
Fig 5: Piston, Connecting Rod & 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: View Of Piston, Connecting Rod & Bearing Assembly
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.