Tools Required

J 36660-A  Torque/Angle Meter

1. Install a NEW O-ring on the crankshaft position sensor.
2. Lubricate the O-ring with clean engine oil.
3. Install the crankshaft position sensor (1).
   CAUTION: Refer to in FASTENER NOTICE .
4. Install the crankshaft position sensor bolt.

   Tighten 

   Tighten the crankshaft position sensor bolt to 9 N.m (80 in lbs).

   Fig 1: Installing Crankshaft Position Sensor

   Courtesy of GENERAL MOTORS CORP.
5. Wipe all sealing surfaces clean with a dry, lint-free cloth.
6. Work new upper-to-lower crankcase seals (1) into their grooves 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: Installing New Upper-To-Lower Crankcase Seals

   Courtesy of GENERAL MOTORS CORP.

   Important:  Do not allow the sealant into the bolt holes. Sealant in the bolt holes will inhibit proper torquing of the bolts due to hydraulic locking.

7. Apply a thin bead (2) of Gasket Maker, GM P/N US 1052942, Canada 10953466, 6 ML or US 1052943, Canada 10953491, 50 ML or equivalent, to the upper crankcase. From the front of the block apply a bead 1-2 mm thick (0.040-0.080 in) in line with the silicone seal (1) and through the centerline of the bolt holes but not through the bolt holes. Continue applying the bead until the end of the crankcase at the back of the block. Do not apply the bead all the way to the crankshaft rear oil seal.
   Fig 3: Locating Gasket Maker Application Area

   Courtesy of GENERAL MOTORS CORP.

   Important:  The crankshaft oil scraper is stamped with an arrow for the front of engine.

8. Place the crankshaft oil scraper (2) in position on the lower crankcase. Align the holes with the main bearing bolt holes.

   Important:  The crankshaft oil scraper is stamped for the location of the single stud-head bolt.

9. Place into position the main bearing bolts. The single stud-head bolt (1) is used for oil pump pick-up mounting.
   Fig 4: Installing Crankshaft Oil Scraper

   Courtesy of GENERAL MOTORS CORP.
10. Align the lower crankcase with the dowel pins in the upper crankcase.
11. Install the lower crankcase onto the upper crankcase slowly until feeling a positive stop.
12. Inspect the upper-to-lower crankcase joint to make sure the lower crankcase is fully seated on the cylinder block.
13. Loosely install the nine lower crankcase perimeter bolts.
    Fig 5: Installing Lower Crankcase

    Courtesy of GENERAL MOTORS CORP.
14. Tighten the lower crankcase bolts (1 through 16) in proper sequence.

    Tighten 

    1. 14.1. Tighten the lower crankcase bolts in sequence to 20 N.m (15 ft lbs).
    2. 14.2. Tighten the lower crankcase bolts in sequence an additional 70 degrees using the J 36660-A. 
    Fig 6: Identifying Lower Crankcase Bolts Tightening Sequence

    Courtesy of GENERAL MOTORS CORP.
15. Tighten the lower crankcase perimeter bolts (1 through 9) in proper sequence.

    Tighten 

    Tighten the lower crankcase perimeter bolts in sequence to 30 N.m (22 ft lbs).

    Fig 7: Identifying Lower Crankcase Perimeter Bolts Tightening Sequence

    Courtesy of GENERAL MOTORS CORP.