Primary Camshaft Intermediate Drive Chain Tensionser Installation (First Design - 2007)

Tools Required

• EN 46105  Camshaft Locking Tool. See Special Tools .
• EN 46111  Crankshaft Rotation Socket. See Special Tools .
• EN 46112  Tensioner Retraction Pins. See Special Tools .
• J 45027  Tensioner Tool. See Special Tools .

Fig 1: Identifying Left & Right Secondary Camshaft Drive Chain Tensioner & Primary Camshaft Drive Chain Tensioner
Courtesy of GENERAL MOTORS CORP.
1. Ensure that the primary camshaft drive chain tensioner (3) is being installed.
Fig 2: View Of Primary Camshaft Drive Chain Tensioner Plunger & J 45027
Courtesy of GENERAL MOTORS CORP.
2. Using the J 45027  , reset the primary camshaft drive chain tensioner plunger. See Special Tools .
Fig 3: Installing Plunger Into Primary Camshaft Drive Chain Tensioner Body
Courtesy of GENERAL MOTORS CORP.
3. Install the plunger into the primary camshaft drive chain tensioner body.
Fig 4: Identifying EN 46112
Courtesy of GENERAL MOTORS CORP.
4. Compress the plunger into the body and lock the primary camshaft drive chain tensioner by inserting the EN 46112  into the access hole in the side of the primary camshaft drive chain tensioner body. See Special Tools .
5. Slowly release pressure on the primary camshaft drive chain tensioner. The primary camshaft drive chain tensioner should remain compressed.
Fig 5: Identifying Primary Camshaft Drive Chain Tensioner Gasket
Courtesy of GENERAL MOTORS CORP.
6. Install a NEW primary camshaft drive chain tensioner gasket to the primary camshaft drive chain tensioner.
7. Install the primary camshaft drive chain tensioner bolts through the primary camshaft drive chain tensioner and gasket.
8. Ensure the primary camshaft drive chain tensioner mounting surface on the engine block does not have any burrs or defects that would degrade the sealing of the NEW primary camshaft drive chain tensioner gasket.
Fig 6: Primary Camshaft Drive Chain Tensioner
Courtesy of GENERAL MOTORS CORP.
9. Place the primary camshaft drive chain tensioner into position and loosely install the bolts to the block.
Fig 7: Locating Primary Camshaft Drive Chain Tensioner Gasket Tab
Courtesy of GENERAL MOTORS CORP.
NOTE: Refer to Fastener Notice .
10. Verify the proper placement of the primary camshaft drive chain tensioner gasket tab (1).
    1. First Pass

       Tighten:  Tighten the primary camshaft drive chain tensioner bolts to 5 N.m (44 lb in).

    2. Final Pass

       Tighten:  Tighten the primary camshaft drive chain tensioner bolts to 23 N.m (17 lb ft).

Fig 8: Primary Camshaft Drive Chain Tensioner
Courtesy of GENERAL MOTORS CORP.
11. Release the primary camshaft drive chain tensioner by pulling out the EN 46112  and unlocking the tensioner plunger. See Special Tools .
12. Verify the primary and left secondary camshaft drive chain timing mark alignments. Refer to First Design - 2007 .
Fig 9: Identifying EN 46105-1
Courtesy of GENERAL MOTORS CORP.
13. Remove the EN 46105-1 from the rear of the left camshafts.
Fig 10: Crankshaft Sprocket Stage 1 & 2 Alignment Position
Courtesy of GENERAL MOTORS CORP.
14. Using the EN 46111  , rotate the crankshaft and crankshaft sprocket from the stage 1 alignment position to the stage 2 alignment position (1), 115 crankshaft degrees, in order to install the right secondary camshaft drive chain components. See Special Tools .
Fig 11: EN 46105-2 Installed To Left Camshafts
Courtesy of GENERAL MOTORS CORP.
15. Install the EN 46105-2 onto the rear of the left camshafts.
Fig 12: EN 46105-1 Installed To Right Camshafts
Courtesy of GENERAL MOTORS CORP.
16. Install the EN 46105-1 onto the rear of the right camshafts.