104. Lower Crankcase Installation

Lower Crankcase Installation

Tools Required
^ J39946 Crankshaft Socket - 4.0L and 4.6L
^ J45059 Angle Meter





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.





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 inch) thick until the first bolt hole. Expand to 2.5 - 3 mm (0.098 - 0.118 inch) thick from the first to the third bolt hole. After the third bolt hole the bead should be reduced to 1 mm (0.039 inch) until running off the end of the crankcase. Do not continue the bead all the way to the rear crankshaft seal.





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.





7. Install the NEW oil manifold plate.

8. Notice: Refer to Fastener Notice.

Install the oil manifold plate bolts.
Tighten the oil manifold plate bolts to 10 Nm (89 inch lbs.).





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.





11. Install the left side upper-to-lower crankcase perimeter bolts.





12. Install the right side upper-to-lower crankcase perimeter bolts.





13. Install the lower crankcase bolts.
1. First Pass
Tighten the lower crankcase bolts (1-20) to 20 Nm (15 ft. lbs.) in the proper sequence.
2. Final Pass
Tighten the lower crankcase bolts (1-20) an additional 65 degrees in the proper sequence using the J45059.





14. Tighten the upper-to-lower crankcase perimeter bolts (1-8).
Tighten the upper-to-lower crankcase perimeter bolts (1-8) to 30 Nm (22 ft. lbs.) in the proper sequence.
15. Using the J39946 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.