Piston, Connecting Rod, and Bearing Removal

Tools Required

• J 24270  Cylinder Bore Ridge Reamer
• J 42846  Crankshaft Protector Button. See Special Tools and Equipment .

IMPORTANT: Do not remove the excessive material from the cylinder bore. Excessive removal of material may require cylinder boring to the next oversize.
1. Remove the cylinder bore ridge as necessary.
   1. Install the J 42846  onto the front of the crankshaft in order to rotate the crankshaft.
   2. Rotate the crankshaft until the piston is at the bottom of the stroke (BDC).
   3. Place a cloth on top of the piston.
   4. Perform the cutting operation with a J 24270  . Refer to the manufacturer's instructions before using the J 24270  .
   5. Remove the J 24270  .
   Fig 1: Removing Cylinder Bore Ring Ridge
   Courtesy of GENERAL MOTORS CORP.
   6. Rotate the crankshaft until the piston is at top dead center (TDC).
   7. Remove the cloth and the cuttings.
   8. Repeat the procedure for each piston.
IMPORTANT: Place matching marks or numbers on the connecting rods and the connecting rod caps. The connecting rod caps must be assembled to their original connecting rods.
IMPORTANT: When connecting rod bearings are removed, NEW bearings must be installed during assembly.
2. Remove the connecting rod nuts.
3. Remove the connecting rod cap and the connecting rod lower bearing.
Fig 2: View Of Connecting Rod Cap & Connecting Rod Lower Bearing
Courtesy of GENERAL MOTORS CORP.
4. Install rubber fuel line onto the connecting rod bolts to prevent contact with the crankshaft journal.
Fig 3: Installing Rubber Fuel Line Onto Connecting Rod Bolts
Courtesy of GENERAL MOTORS CORP.
5. Remove the piston, connecting rod, and connecting rod upper bearing.
Fig 4: View Of Piston, Connecting Rod, & Connecting Rod Upper Bearing
Courtesy of GENERAL MOTORS CORP.
6. Remove the rubber fuel line from the connecting rod bolts.
Fig 5: View Of Rubber Fuel Line From Connecting Rod Bolts
Courtesy of GENERAL MOTORS CORP.
7. Remove the remaining piston and the connecting rod assemblies.
8. Remove the J 42846  from the front of the crankshaft.