Lower Crankcase Installation (LDK, LHU)

Special Tools 

EN-45059  Angle Meter

For equivalent regional tools, refer to Special Tools (LDK, LHU) .

Fig 1: View of Upper Crankshaft Bearings
Courtesy of GENERAL MOTORS COMPANY
1. Install the upper crankshaft bearings (1) in the engine block (2) and lubricate bearing surfaces with engine oil.
Fig 2: View of Crankshaft
Courtesy of GENERAL MOTORS COMPANY
2. Install the crankshaft (1) on the journals.
Fig 3: View of Lower Bearing Halves
Courtesy of GENERAL MOTORS COMPANY
3. Install the lower bearing halves (1), without grooves, into the lower crankcase (2). Apply oil to bearing surfaces.
Fig 4: View of Bead of Sealer on Bedplate Mating Surface
Courtesy of GENERAL MOTORS COMPANY
NOTE:
• The block assembly surface must be free of contamination prior to applying the sealer.
• Install and align the bedplate to block within 20 minutes of applying the sealer.
• The bedplate must be fastened to final torque specification within 60 minutes of applying the sealer.
4. Ensure proper use of room temperature vulcanizing (RTV) sealant.

   Use of Room Temperature Vulcanizing (RTV) and Anaerobic Sealant 

5. Apply a 4.25 mm bead of sealer, dimension a, directly in the groove of the block to bedplate mating surfaces. Refer to Adhesives, Fluids, Lubricants, and Sealers .
Fig 5: View of Lower Crankcase
Courtesy of GENERAL MOTORS COMPANY
6. Install the lower crankcase (1). Tap gently into place with a suitable tool, if necessary. Ensure the lower crankcase is aligned properly on the dowels.
Fig 6: Identifying Crankshaft Bearing Bolt Tightening Sequence
Courtesy of GENERAL MOTORS COMPANY
CAUTION:

Refer to Fastener Caution .

7. Install the NEW crankshaft bearing bolts in sequence finger tight.
8. Tighten the crankshaft bearing bolts:
   1. Tighten the crankshaft bearing bolts a first pass in sequence to 20 N.m (15 lb ft).
   2. Using the EN-45059  angle meter, tighten the crankshaft bearing bolts a final pass in sequence to 70 degrees.
Fig 7: Lower Crankcase Perimeter Bolt Tightening Sequence
Courtesy of GENERAL MOTORS COMPANY
NOTE:

Do not forget the 2 rear outer bolts.

9. Install the lower crankcase perimeter bolts (1-10) and tighten to 25 N.m (18 lb ft).