Lower Crankcase Installation

Special Tools

• EN 45059  Angle Meter
• EN-51380  Seal Installer

For equivalent regional tools, refer to Special Tools .

Fig 1: Crankshaft Lower Bearings
Courtesy of GENERAL MOTORS COMPANY
NOTE:

Crankshaft bearings MUST be separated, marked, or organized in a way to ensure installation to their original location and position, when suitable for use.

1. Install the lower bearing halves (2), without grooves, into the lower crankcase (1). Apply oil to bearing surfaces.
Fig 2: Applying Bead Of Sealer Directly In Groove
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.
2. Apply a 4.25 mm bead of sealer directly in the groove (1) of the block to bedplate mating surfaces. Refer to Adhesives, Fluids, Lubricants, and Sealers .
Fig 3: Lower Crankcase Perimeter Bolts
Courtesy of GENERAL MOTORS COMPANY
3. Install the lower crankcase (2). Tap gently into place with a suitable tool if necessary. Ensure it is aligned properly on the dowels.
CAUTION:

This vehicle is equipped with torque-to-yield or single use fasteners. Install a NEW torque-to-yield or single use fastener when installing this component. Failure to replace the torque-to-yield or single use fastener could cause damage to the vehicle or component.

4. Install the NEW crankshaft bearing bolts (1) finger tight.
5. Install the lower crankcase perimeter bolts (3) finger tight.
Fig 4: Crankshaft Bearing Bolts In Sequence
Courtesy of GENERAL MOTORS COMPANY
CAUTION:

Refer to Fastener Caution .

6. Tighten the crankshaft bearing bolts in sequence using the following procedure:
   1. Tighten the crankshaft bearing bolts a first pass in sequence to 20 N.m (15 lb ft).
   2. Tighten the crankshaft bearing bolts a final pass in sequence using the EN 45059  meter an additional 140 degrees.
Fig 5: Lower Crankcase Perimeter Bolts In Sequence
Courtesy of GENERAL MOTORS COMPANY
7. Tighten the lower crankcase perimeter bolts in sequence to 25 N.m (18 lb ft).
Fig 6: Oil Gallery Plugs
Courtesy of GENERAL MOTORS COMPANY
8. Install the engine oil gallery plugs (1, 2). Tighten the plugs to 65 N.m (48 lb ft).
Fig 7: Oil Pump Flow Control Valve And Bolts
Courtesy of GENERAL MOTORS COMPANY
9. Install the oil pump flow control valve (2) and bolts (1, 3). tighten the bolts to 10 N.m (89 lb in).
Fig 8: Crankshaft Rear Oil Seal
Courtesy of GENERAL MOTORS COMPANY
10. Using EN-51380  installer (2), install the crankshaft rear oil seal (1) flush or recessed up to 0.5 mm to block.
11. Rotate the crankshaft to ensure that it moves freely and does not bind.
12. Measure and record the crankshaft endplay. Refer to Engine Mechanical Specifications (LTG) .