Lower Crankcase (Unit Repair): Installation

1. Install upper crankshaft bearings and lubricate bearing surfaces with clean engine oil.
   Fig 1: Installing Upper Crankshaft Bearings

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2. Install crankshaft on journals.
   Fig 2: Installing Crankshaft

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   IMPORTANT:  The lower bearing halves do not have oil grooves.

3. Install lower bearing halves (without grooves) into lower crankcase. Apply clean engine oil to bearing surfaces.
   Fig 3: Installing Lower Bearing Halves

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4. Apply RTV Permatex® 25223 (P/N 21019581) to surfaces of engine block to bedplate mating surfaces.
   Fig 4: Applying RTV Permatex® To Engine Block

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5. Install the lower crankcase. Tap gently into place with a suitable tool if necessary. Ensure it is aligned properly on the alignment dowels.
   Fig 5: Installing The Lower Crankcase

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   IMPORTANT:  Always use new crankshaft bearing bolts.

6. Install and tighten crankshaft bearing bolts using tightening sequence.

   Torque: 

   Crankshaft Bearing Cap Initial Torque (Lower Crankcase-to-Block Bolts): 20 N.m (15 ft-lbs) + 70° 

   Fig 6: Crankshaft Bearing Bolt Tightening Sequence

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7. Tighten lower crankcase perimeter bolts using tightening sequence.

Torque: 

Lower Crankcase-to-Block Peripheral Bolts: 25 N.m (19 ft-lbs) 

Fig 7: Lower Crankcase Perimeter Bolts Tightening Sequence

Courtesy of GENERAL MOTORS CORP.