Engine Front Cover Installation (LF4)

Special Tools 

EN-46109  Guide Pins

For equivalent regional tools, refer to Special Tools (LF4) .

1. Courtesy of GENERAL MOTORS COMPANY

   Install the 8 mm (0.315 in) guide from the EN-46109  Guide Pins into the cylinder block positions as shown.

2. Courtesy of GENERAL MOTORS COMPANY

   Install the NEW engine front cover to cylinder block seal.

3. Courtesy of GENERAL MOTORS COMPANY

   NOTE:

   • No RTV sealant should be visible in the M12 bolt holes (1) upon final assembly of front cover to engine.
   • Keep the RTV bead path on the outward edge of the t-joints to ensure proper sealant coverage.

   Ensure proper use of room temperature vulcanizing (RTV) sealant. Use of Room Temperature Vulcanizing (RTV) and Anaerobic Sealant

4. Apply a 3 mm (0.118 in) bead of RTV sealant on the engine front cover as shown (2).
5. Apply a 5 mm (0.197 in) bead of RTV sealant on the engine front cover as shown (3). Refer to Adhesives, Fluids, Lubricants, and Sealers (LF4) for recommended sealant.

6. Courtesy of GENERAL MOTORS COMPANY

   Place the engine front cover (1) onto the EN-46109  Guide Pins and slide into position.

7. Remove the EN-46109  Guide Pins from the cylinder block.
NOTE:

Some applications are equipped with a drive belt tensioner utilizing engine front cover bolts. The drive belt tensioner must be installed along with the engine front cover before the engine front cover bolts are installed.

8. Hand start all the engine front cover bolts.
9. Fig 1: Identifying Engine Front Cover Bolts With Tightening Sequence (LF4)

   Courtesy of GENERAL MOTORS COMPANY
   CAUTION:

   Refer to Fastener Caution .

   NOTE:

   Engine front cover bolts in the number (25) location are model dependent and may not apply.

   Tighten the engine front cover bolts (1 - 23) in the sequence shown to 20 N.m (15 lb ft).

   1. Tighten the engine front cover bolts (1 - 23) a second pass in sequence to 20 N.m (15 lb ft).
   2. Tighten the engine front cover bolts (1 - 23) a third pass in sequence an additional 60 degrees.
   3. Tighten the engine front cover bolts (24) to 15 N.m (11 lb ft).
   4. Tighten the engine front cover bolts (25) to 65 N.m (48 lb ft).

10. Courtesy of GENERAL MOTORS COMPANY

    Place the camshaft position actuator valves (2) in position on the front cover.

11. Install the camshaft position actuator valve bolts (1) and tighten to 10 N.m (89 lb in).

12. Courtesy of GENERAL MOTORS COMPANY

    NOTE:

    Inspect the camshaft position sensor O-ring seals. If the seals are damaged, the entire camshaft position sensor must be replaced.

    Place the camshaft position sensors (2) in position on the front cover.

13. Install the camshaft position sensor bolts (1) and tighten to 10 N.m (89 lb in).