Camshaft Installation

Special Tools 

EN-422  Installer

For equivalent regional tools, refer to Special Tools .

1. Install the intake camshaft (1).
   Fig 1: Intake Camshaft Bearing Cover Bolts Tightening Sequence

   Courtesy of GENERAL MOTORS COMPANY
   NOTE: Coat with MoS 2 lubricating paste. Refer to Adhesives, Fluids, Lubricants and Sealers .
2. Install the 4 intake camshaft bearing cover number 2-5.
   NOTE: Note the identification marking on the camshaft bearing cover.
3. Install the 8 intake camshaft bearing cover bolts and tighten in a spiral from the inside to the outside to 8 N.m (71 lb in).
   CAUTION: Refer to Fastener Caution .
4. Install the exhaust camshaft (1).
   Fig 2: Exhaust Camshaft Bearing Cover Bolts Tightening Sequence

   Courtesy of GENERAL MOTORS COMPANY
   NOTE: Coat with MoS 2 lubricating paste. Refer to Adhesives, Fluids, Lubricants and Sealers .
5. Install the 4 exhaust camshaft bearing cover number 6-9.
   NOTE: Note the identification marking on the camshaft bearing cover.
6. Install the 8 exhaust camshaft bearing cover bolts and tighten in a spiral from the inside to the outside to 8 N.m (71 lb in).
7. Clean sealing surfaces of the first camshaft bearing support and the cylinder head with a suitable tool.
   Fig 3: View Of Oil Duct

   Courtesy of GENERAL MOTORS COMPANY
   NOTE: Sealing surfaces must be free from oil and grease.

   Clean oil duct from any sealant residue.

   Fig 4: View Of Sealing Surfaces And Grooves

   Courtesy of GENERAL MOTORS COMPANY
   NOTE:

   • Sealing surfaces (arrows) must be free from oil and grease.
   • It is essential to ensure that no sealant is applied outside the marked sealing areas (1).
   • The grooves adjacent to the sealing surfaces must remain free from sealant.
8. Apply surface sealant to sealing surfaces of the first camshaft bearing cap thinly and evenly.
9. Position the first camshaft bearing cap on the cylinder block and tighten the bolts approximately to 2 N.m (18 lb in).
10. Install the first camshaft bearing cap.
    Fig 5: Camshaft Bearing Cap

    Courtesy of GENERAL MOTORS COMPANY
    NOTE: No sealant may reach the camshafts.
11. Install the first camshaft bearing cap (1) bolts and tighten to 8 N.m (71 lb in).
    NOTE: Note installation sequence 1-4.
12. Install 2 NEW sealing rings to the camshafts.
    Fig 6: Camshaft Sprocket Bolt, Shims And Tool

    Courtesy of GENERAL MOTORS COMPANY
13. Tighten the seal ring with EN-422  installer (3) on the camshaft until this is in contact with the cylinder head.
14. To install, use camshaft sprocket bolt (1) in conjunction with shims (2) with a total thickness of approximately 10 mm.
15. Remove the EN-422  installer (3).