Crankshaft and Bearings Removal

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: Crankshaft Main Bearing Cap Bolts And Side Bolt

   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.
3. Install J 41348 into the crankshaft main bearing cap bolt holes.

   Tighten: 

   Tighten the bolts on J 41348 to 12 N.m (100 lb in). 

4. Install J 6125-B to J 41348.
5. Use J 6125-1B to remove the crankshaft main lower bearing caps.
6. Remove the crankshaft.
   Fig 2: Removing Crankshaft

   Courtesy of GENERAL MOTORS CORP.
7. Remove the upper main bearings from the engine block.
   Fig 3: Upper Main Bearings To The Engine Block

   Courtesy of GENERAL MOTORS CORP.