Piston, Connecting Rod, and Bearing Removal

Tools Required 

• J 24270  Ridge Reamer. See Special Tools and Equipment .
• J 5239  Connecting Rod Bolt Guide. See Special Tools and Equipment .

1. Mark the piston with the number of the cylinder from which the piston is being removed.
2. Mark the connecting rod and the connecting rod cap in order to ensure correct assembly.
   Fig 1: View Of J 24270

   Courtesy of GENERAL MOTORS CORP.
   NOTE: 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.
3. Use the J 24270  in order to remove the cylinder bore ring ridge.

   Complete the following steps:

   1. 3.1. Turn the crankshaft until the piston is at the bottom of the stroke.
   2. 3.2. Cover the piston with a cloth.
   3. 3.3. Remove the cylinder ring ridge.
   4. 3.4. Turn the crankshaft until the piston is at the top of the stroke.
   5. 3.5. Remove the cloth.
   6. 3.6. Remove the metal shavings from the cylinder and piston.
4. Remove the connecting rod nuts and cap.
5. Remove the connecting rod cap and bearing half.
   NOTE: Install thread protector in order to avoid damage to the crankshaft journal.
6. Install J 5239  onto the connecting rod bolts.
7. Remove the connecting rod and piston assembly.
   Fig 2: Removing Connecting Rod & Piston Assembly

   Courtesy of GENERAL MOTORS CORP.
8. Push out the assembly using a suitable tool.