Lower Crankcase Installation

Tools Required

• J 39946  Crankshaft Socket - 4.0L and 4.6L
• J 45059  Angle Meter

Fig 1: View Of Upper-To-Lower Crankcase Seals
Courtesy of GENERAL MOTORS CORP.
1. Wipe all sealing surfaces clean with a dry, lint-free cloth.
2. Work the NEW upper-to-lower crankcase seal into its groove starting at both ends and working the seal towards the center. The seal must not be torn, nicked or out of the groove over its entire length on both sides of the crankcase.
Fig 2: Applying Adhesive To Upper Crankcase
Courtesy of GENERAL MOTORS CORP.
3. Apply a thin bead (2) of Gasket Maker, GM P/N 1052942, (Canadian P/N 10953466), or equivalent, to the upper crankcase. The bead should run parallel to the silicone seal (1) and through the centerline of the bolt holes but not through the bolt holes. Starting from the front of the block, the bead should be about 1 mm (0.039 in) thick until the first bolt hole. Expand to 2.5-3 mm (0.098-0.118 in) thick from the first to the third bolt hole. After the third bolt hole the bead should be reduced to 1 mm (0.039 in) until running off the end of the crankcase. Do not continue the bead all the way to the rear crankshaft seal.
Fig 3: View Of Lower Crankcase
Courtesy of GENERAL MOTORS CORP.
4. Align the lower crankcase with the dowel pins in the upper crankcase.
5. Install the lower crankcase onto the upper crankcase slowly until feeling a positive stop.
6. Inspect the upper-to-lower crankcase joint in order to make sure the lower crankcase is fully seated on the cylinder block.
Fig 4: View Of Oil Manifold Plate
Courtesy of GENERAL MOTORS CORP.
7. Install the NEW oil manifold plate.
NOTE: Refer to Fastener Notice in Cautions and Notices.
8. Install the oil manifold plate bolts.

   Tighten:  Tighten the oil manifold plate bolts to 10 N.m (89 lb in).

Fig 5: View Of Main Bearing Single Stud-Head Bolt
Courtesy of GENERAL MOTORS CORP.
9. Place the crankshaft oil scraper in position on the oil manifold. Align the holes with the main bearing bolt holes.
10. Install the main bearing bolts. The single stud-head bolt (1) used for oil pump pick-up mounting goes, in the inboard position of the third set of main bearing bolts from the front of the engine.
Fig 6: View Of Lower Left Crankcase Perimeter Retaining Bolts
Courtesy of GENERAL MOTORS CORP.
11. Install the left side upper-to-lower crankcase perimeter bolts.
Fig 7: View Of Right Upper-To-Lower Crankcase Perimeter Bolts
Courtesy of GENERAL MOTORS CORP.
12. Install the right side upper-to-lower crankcase perimeter bolts.
Fig 8: Tightening Lower Crankcase Bolts
Courtesy of GENERAL MOTORS CORP.
13. Install the lower crankcase bolts.
    1. First Pass

       Tighten:  Tighten the lower crankcase bolts (1-20) to 20 N.m (15 lb ft) in the proper sequence.

    2. Final Pass

       Tighten:  Tighten the lower crankcase bolts (1-20) an additional 65 degrees in the proper sequence using the J 45059  .

Fig 9: Tightening Upper-To-Lower Crankcase Perimeter Bolts
Courtesy of GENERAL MOTORS CORP.
14. Tighten the upper-to-lower crankcase perimeter bolts (1-8).

    Tighten:  Tighten the upper-to-lower crankcase perimeter bolts (1-8) to 30 N.m (22 lb ft) in the proper sequence.

15. Using the J 39946  rotate the crankshaft until the number one piston is at top dead center (TDC) and the crankshaft key way is approximately at the 7 o'clock position. See Special Tools .