Tools Required

J 43032  Crankshaft Socket

1. Place the primary camshaft drive chain tensioner oil tube (1) in position on the cylinder block.
   CAUTION: Refer to in FASTENER NOTICE .
2. Install the primary camshaft drive chain tensioner oil tube bolts.

   Tighten 

   Tighten the primary camshaft drive chain tensioner oil tube bolts to 9 N.m (80 in lbs).

   Fig 1: Installing Primary Camshaft Drive Chain Tensioner

   Courtesy of GENERAL MOTORS CORP.
3. Install the primary camshaft drive chain.
   Fig 2: Installing Primary Camshaft Drive Chain

   Courtesy of GENERAL MOTORS CORP.

   Important:  Do not remove the J 42038. 

4. To assist in primary camshaft drive chain installation, use an open end wrench on the hex cast into the camshaft to provide minor adjustments to the secondary sprocket position.
   Fig 3: Using An Open End Wrench On Hex Cast

   Courtesy of GENERAL MOTORS CORP.
5. When installing the primary camshaft drive chain you must set the base engine timing. Base engine timing is set with cylinder number one at top dead center (TDC) starting the intake stroke and with the correct camshaft to balance shaft to crankshaft relationship. To set the correct base engine timing proceed as follows:
   1. 5.1. Rotate the crankshaft until cylinder number one is at top dead center and the crankshaft sprocket timing mark (6) is at the four o'clock position using the J 43032. 
   2. 5.2. Rotate the balance shaft until its timing mark (7) is at the five o'clock position.
6. Make sure the darkened chain links on the primary camshaft drive chain are facing toward the front of the engine.
   Fig 4: Identifying Correct Crankshaft Drive Chain Installation Position

   Courtesy of GENERAL MOTORS CORP.
7. Center the timing mark (1) on the left hand intake camshaft between the paired darkened timing links (2) and wrap the chain around the sprocket. Allow the remainder of the primary camshaft drive chain to drop into the crankcase area once the timing mark is aligned.
8. Fabricate a hook out of wire and feed it down through the right cylinder head. Use the hook to pull the remainder of the primary camshaft drive chain up to the right intake camshaft sprocket.
9. While pulling the timing chain up to the right cylinder head, align the darkened chain links with the balance shaft (7) and crankshaft (6) sprockets.
10. Wrap the primary camshaft drive chain around the right intake camshaft sprocket and align the darkened link (8) with the sprocket's timing mark (9).
11. Make sure all the timing marks are properly aligned with the darkened chain links.
12. Install the primary camshaft drive chain tensioner shoe (1).
13. Install the primary camshaft drive chain tensioner shoe bolt using the access hole in the cylinder head.

    Tighten 

    Tighten the primary camshaft drive chain tensioner shoe bolt to 30 N.m (22 ft lbs).

    Fig 5: Installing Primary Camshaft Drive Chain Tensioner Shoe

    Courtesy of GENERAL MOTORS CORP.
14. Collapse the primary camshaft drive chain tensioner using the following procedure:
    1. 14.1. Rotate the ratchet release lever (2) counterclockwise and hold.
    2. 14.2. Collapse the tensioner shoe (1) and hold.
    3. 14.3. Release the ratchet lever and slowly release the pressure on the shoe.
15. As the ratchet lever moves to its first click, hold the tensioner shoe inward. Insert a pin through the hole in the release lever.
16. The locked ratchet mechanism should hold the shoe in a collapsed position.
    Fig 6: Collapsing Primary Camshaft Drive Chain Tensioner

    Courtesy of GENERAL MOTORS CORP.

    Important:  Ensure that the primary camshaft drive chain tensioner release lever faces toward you before tightening.

17. Install the primary camshaft drive chain tensioner (1) and primary camshaft drive chain tensioner bolts.

    Tighten 

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

    Fig 7: Installing Primary Camshaft Drive Chain Tensioner

    Courtesy of GENERAL MOTORS CORP.
18. Ensure that all the timing marks (1-9) are properly aligned. Make adjustments as necessary.
19. Remove the pin holding the primary camshaft drive chain tensioner to tighten any slack in the timing chain.
    Fig 8: Identifying Correct Crankshaft Drive Chain Installation Position

    Courtesy of GENERAL MOTORS CORP.

    Important:  Ensure that each chain guide access plug has an O-ring installed.

20. Install the four chain guide access plugs.

    Tighten 

    Tighten the chain guide access plugs to 5 N.m (44 in lbs).

    Fig 9: Installing Chain Guide Access Plugs

    Courtesy of GENERAL MOTORS CORP.
21. Install a NEW O-ring on the camshaft position sensor.
22. Lubricate the O-ring with clean engine oil.
23. Install the camshaft position sensor.
24. Install the camshaft position sensor and bolt.

    Tighten 

    Tighten the camshaft position sensor bolt to 9 N.m (80 in lbs).

    Fig 10: Installing Camshaft Position Sensor

    Courtesy of GENERAL MOTORS CORP.
25. Install the front engine lift bracket, hex head bolt and TORX® internal drive bolt.

    Tighten 

    1. 25.1. Tighten the front lift bracket hex head bolt to 50 N.m (37 ft lbs).
    2. 25.2. Tighten the front lift bracket TORX® internal drive bolt to 25 N.m (18 ft lbs).
    Fig 11: Installing Front Engine Left Bracket

    Courtesy of GENERAL MOTORS CORP.