Lower Crankcase Installation

Tools Required

• EN 46109  Guide Pins. See Special Tools .
• J 39946  Crankshaft Socket - 4. See Special Tools .0L and 4.6L
• J 45059  Angle Meter. See Special Tools .

Fig 1: Identifying RTV Sealant Application Points
Courtesy of GENERAL MOTORS CORP.
1. Place a 5 mm (0.197 in) spot of RTV sealant GM P/N 12378521 or equivalent (1) at the two points where the crankshaft rear oil seal meets the split line of the engine block.
Fig 2: Applying RTV Sealant
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Ensure components being sealed with RTV are assembled within 20 minutes. Components assembled after the RTV has skinned-over, approximately 20 minutes, will not seal properly.
2. Completely fill and slightly overfill the engine block seal groove with a continuous bead of RTV sealant GM P/N 12378521 or equivalent.
3. Ensure the RTV sealant GM P/N 12378521 or equivalent bead is higher then the rail surface (1) by 3 mm (0.118 in).
Fig 3: Spreading RTV Sealant Near Oil Drain Back Passages
Courtesy of GENERAL MOTORS CORP.
4. Using a suitable tool spread the sealant in the area near the oil drain back passages (1) away from the oil drain back passages toward the outboard edge of the rail surface.
Fig 4: Identifying EN 46109 Guide Pins
Courtesy of GENERAL MOTORS CORP.
5. To prevent shifting of the lower crankcase install one of the EN 46109  into a bolt hole in each rail. See Special Tools .
Fig 5: View Of Lower Crankcase
Courtesy of GENERAL MOTORS CORP.
6. Install the cleaned lower crankcase onto the engine.
Fig 6: Tapping Lower Crankcase To Position
Courtesy of GENERAL MOTORS CORP.
7. Using a rubber mallet gently tap the lower crankcase into position.
8. Remove both of the EN 46109  . See Special Tools .
Fig 7: Identifying Crankcase Perimeter Retaining Bolts on Right of Engine
Courtesy of GENERAL MOTORS CORP.
9. Loosely install the crankcase perimeter bolts on the right side.
Fig 8: Identifying Crankcase Perimeter Retaining Bolts on Left of Engine
Courtesy of GENERAL MOTORS CORP.
10. Loosely install the crankcase perimeter bolts on the left side.
Fig 9: Locating Oil Drain Back Passages
Courtesy of GENERAL MOTORS CORP.
11. Using a small long blade screwdriver clean out any sealant in the oil drain back passages (1).
Fig 10: Identifying RTV Application Areas
Courtesy of GENERAL MOTORS CORP.
IMPORTANT: Ensure components being sealed with RTV are assembled within 20 minutes. Components assembled after the RTV has skinned-over, approximately 20 minutes, will not seal properly.
12. Using a NEW oil distribution plate place a continuous 3 mm (0.118 in) wide bead of RTV sealant GM P/N 12378521 or equivalent on top of the outer seal (1) of the oil distribution plate place.
Fig 11: Identifying Guide Pins
Courtesy of GENERAL MOTORS CORP.
13. To prevent shifting of the oil distribution plate install one of the EN 46109  into a bolt hole in each side of the lower crankcase. See Special Tools .
Fig 12: View Of Oil Distribution Plate
Courtesy of GENERAL MOTORS CORP.
14. Install the NEW oil distribution plate.
15. Remove both of the EN 46109  . See Special Tools .
Fig 13: Identifying Oil Distribution Plate Bolts
Courtesy of GENERAL MOTORS CORP.
NOTE: Refer to Fastener Notice.
16. Install the oil distribution plate bolts.

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

Fig 14: Cleaning Out Sealant In Oil Drain Back Passages
Courtesy of GENERAL MOTORS CORP.
17. Using a small long blade screwdriver clean out any sealant in the oil drain back passages.
Fig 15: Identifying Stud-end Bolt
Courtesy of GENERAL MOTORS CORP.
18. Install the crankshaft oil scraper plate.
19. Install the main bearing bolts. Ensure the stud-head bolt (1) used for the oil suction tube support bracket is placed in the proper position.
Fig 16: Identifying Lower Crankcase Bolts
Courtesy of GENERAL MOTORS CORP.
20. Tighten the main bearing bolts in the proper sequence.
    1. First Pass

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

    2. Final Pass

       Tighten:  Tighten the main bearing bolts (1-20) an additional 65 degrees in the proper sequence using the J 45059  . See Special Tools .

Fig 17: Tightening Upper-to-lower Crankcase Perimeter Bolts
Courtesy of GENERAL MOTORS CORP.
21. Tighten the crankcase perimeter bolts in sequence shown.

    Tighten:  Tighten the crankcase perimeter bolts to 30 N.m (22 lb ft).

Fig 18: Cleaning Out Sealant In Oil Drain Back Passages
Courtesy of GENERAL MOTORS CORP.
22. Using a small long blade screwdriver verify that the threaded holes for the oil pan bolts and the oil drain back passages are clear of sealant.
23. 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 .