Tools Required

• J 6125-1B  Slide Hammer
• J 41348  Main Bearing Cap Puller

Important:  This engine has side bolts on all of the main caps except the rear cap. These bolts must be removed to service the caps.

1. Remove the crankshaft main bearing cap side bolts.
2. Remove the crankshaft main bearing cap bolts.
   Fig 1: Removing Crankshaft Main Bearing Cap Side Bolts And Crankshaft Main Bearing Cap Bolts

   Courtesy of GENERAL MOTORS CORP.
   NOTE: Main bearing caps are press fit. Remove the caps carefully for service. J 41348 has been designed to work with J 6125-B in order to prevent damage to the bearing and cap. J 41348 MUST be installed properly into the bolt holes of the caps and J 6125-B attached to J 41348 in order to properly remove the main cap without damaging the bearing or the cap. Any deviation from this procedure may cause damage to the cap and the bearing and may result in future engine damage.
   NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
3. Install J 41348 into the crankshaft main bearing cap bolt holes.

   Tighten 

   Tighten the bolts on J 41348 to 12 N.m (100 Inch lbs).

4. Install J 6125-1B to J 41348.
5. Use J 6125-1B to remove the crankshaft main lower bearing caps.
   Fig 2: Installing J 6125-1B To J 41348

   Courtesy of GENERAL MOTORS CORP.
6. Remove the crankshaft.
7. Remove the upper main bearings from the engine block.
   Fig 3: Removing Crankshaft

   Courtesy of GENERAL MOTORS CORP.