Lower Crankcase Installation

Special Tools 

EN-45059  Angle Meter

For equivalent regional tools, refer to Special Tools .

1. Apply a 3 mm (0.12 in) bead of sealer (2) on the lower crankcase. Refer to Adhesives, Fluids, Lubricants and Sealers .
   Fig 1: Lower Crankcase Silicone Application Points

   Courtesy of GENERAL MOTORS COMPANY
   NOTE:

   • The block assembly and the lower crankcase surface must be free of contamination prior to applying the sealer.
   • The lower crankcase must be fastened to final torque specification within 20 minutes of applying the sealer.
2. Apply an additionally 3 mm (0.12 in) bead of sealer about a length of 20 mm (0.90 in) in the outer regions (1, 3).
3. Apply an additionally 3 mm bead of sealer about a length of 5 mm (0.20 in), in the outer region (4).
4. Install the lower crankcase (1).
   Fig 2: Lower Crankcase Bolts

   Courtesy of GENERAL MOTORS COMPANY
5. Install 10 NEW crankshaft bearing cap tie plate bolts (2).
6. Tighten the 10 NEW lower crankshaft bolts in the sequence as shown, use the EN-45059  Angle Meter.
   Fig 3: Lower Crankshaft Bolt Tightening Sequence

   Courtesy of GENERAL MOTORS COMPANY
   CAUTION: Refer to Fastener Caution .
   CAUTION: Refer to Torque-to-Yield Fastener Caution .
   1. First pass tighten to 50 N.m (37 lb ft).
   2. Second pass to 120 degrees.
   3. Third pass to 15 degrees.
7. Install the 2 long lower crankcase bolts (1) and tighten to 25 N.m (18 lb ft).
   Fig 4: Lower Crankcase Bolts

   Courtesy of GENERAL MOTORS COMPANY
8. Install the 8 short lower crankcase bolts (2) and tighten to 25 N.m (18 lb ft).