Primary Camshaft Intermediate Drive Chain Tensioner Installation

Special Tools

• EN-45027  Tensioner Tool
• EN-46112  Tensioner Retraction Pins
• EN-48383  Camshaft Retaining Tools
• EN-48589  Crankshaft Rotation Socket

For equivalent regional tools, refer to Special Tools .

Fig 1: Left & Right Secondary Camshaft Drive Chain Tensioner & Primary Camshaft Drive Chain Tensioner
Courtesy of GENERAL MOTORS COMPANY
1. Ensure that the primary camshaft drive chain tensioner (3) is being installed.
Fig 2: Resetting Primary Camshaft Drive Chain Tensioner Plunger
Courtesy of GENERAL MOTORS COMPANY
2. Using the EN-45027  tool, reset the primary camshaft drive chain tensioner plunger.
Fig 3: Plunger & Primary Camshaft Drive Chain Tensioner Body
Courtesy of GENERAL MOTORS COMPANY
3. Install the plunger into the primary camshaft drive chain tensioner body.
Fig 4: Locking Plunger Of Camshaft Drive Chain Tensioner
Courtesy of GENERAL MOTORS COMPANY
4. Compress the plunger into the body and lock the primary camshaft drive chain tensioner by inserting the EN-46112  pins into the access hole in the side of the primary camshaft drive chain tensioner body.
5. Slowly release pressure on the primary camshaft drive chain tensioner. The primary camshaft drive chain tensioner should remain compressed.
Fig 5: Primary Camshaft Drive Chain Tensioner Gasket
Courtesy of GENERAL MOTORS COMPANY
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 & Bolts
Courtesy of GENERAL MOTORS COMPANY
9. Place the primary camshaft drive chain tensioner into position and loosely install the bolts to the block.
Fig 7: Primary Camshaft Drive Chain Tensioner Gasket Tab
Courtesy of GENERAL MOTORS COMPANY
CAUTION:

Refer to Fastener Caution .

10. Verify the proper placement of the primary camshaft drive chain tensioner gasket tab (1).
    1. First Pass

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

    2. Final Pass

       Tighten the primary camshaft drive chain tensioner bolts to 25 N.m (18 lb ft).

Fig 8: Primary Camshaft Drive Chain Tensioner
Courtesy of GENERAL MOTORS COMPANY
11. Release the primary camshaft drive chain tensioner by pulling out the EN-46112  pins and unlocking the tensioner plunger.
12. Verify the primary and left secondary camshaft drive chain timing mark alignments. Refer to Timing Chain Alignment Diagram - Stage One.
Fig 9: Camshaft Holding Tool
Courtesy of GENERAL MOTORS COMPANY
13. Remove the EN 48383-1 from the rear of the left camshafts.
Fig 10: Stage 1 & Stage 2 Alignment Positions
Courtesy of GENERAL MOTORS COMPANY
14. Using the EN-48589  socket, rotate the crankshaft and crankshaft sprocket from the stage 1 alignment position (1) to the stage 2 alignment position (2), 115 crankshaft degrees, in order to install the right secondary camshaft drive chain components.
Fig 11: Special Tool Installed To Left Camshafts
Courtesy of GENERAL MOTORS COMPANY
15. Install the EN 48383-2 onto the rear of the left camshafts.
Fig 12: Camshaft Holding Tool
Courtesy of GENERAL MOTORS COMPANY
16. Install the EN 48383-3 onto the rear of the right camshafts.