Camshaft Installation

Special Tools 

EN-422  Installer

For equivalent regional tools, refer to Special Tools .

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 .

1. Install the intake camshaft (1).
NOTE:

Note the identification marking on the camshaft bearing cover.

2. Install the 4 intake camshaft bearing cover number 2-5.
CAUTION:

Refer to Fastener Caution .

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).
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 .

4. Install the exhaust camshaft (1).
NOTE:

Note the identification marking on the camshaft bearing cover.

5. Install the 4 exhaust camshaft bearing cover number 6-9.
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).
Fig 3: Oil Duct
Courtesy of GENERAL MOTORS COMPANY
NOTE:

Sealing surfaces must be free from oil and grease.

Fig 4: 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.
7. Clean sealing surfaces of the first camshaft bearing support and the cylinder head with a suitable tool.

   Clean oil duct from any sealant residue.

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).
Fig 5: Camshaft Bearing Cap
Courtesy of GENERAL MOTORS COMPANY
NOTE:

No sealant may reach the camshafts.

10. Install the first camshaft bearing cap.
NOTE:

Note installation sequence 1-4.

11. Install the first camshaft bearing cap (1) bolts and tighten to 8 N.m (71 lb in).
Fig 6: Camshaft Sprocket Bolt, Shims And Tool
Courtesy of GENERAL MOTORS COMPANY
12. Install 2 NEW sealing rings to the camshafts.
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).