Secondary Timing Chain Tensioner Installation - Left Side (Second design - 2007)

Tools Required

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

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

    2. Final Pass

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

Fig 8: Removing EN 46112 From Tensioner Plunger
Courtesy of GENERAL MOTORS CORP.
11. Release the left secondary camshaft drive chain tensioner by pulling out the EN 46112  and unlocking the tensioner plunger. See Special Tools .
12. Verify the left secondary camshaft drive chain timing mark alignments. Refer to Second Design 2007 .