Timing Chain and Sprockets Installation

Tools Required 

J 5590  Pinion Bearing Race Installer - Rear. See Special Tools and Equipment .

1. Install the crankshaft balancer key into the crankshaft keyway.

   The crankshaft balancer key should be parallel to the crankshaft or with a slight incline.

Fig 1: Installing Crankshaft Balancer Key
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2. Align the keyway of the crankshaft sprocket with the crankshaft balancer key.
CAUTION: Refer to Safety Glasses Caution in Cautions and Notices.
3. Use the J 5590  in order to install the crankshaft sprocket.
Fig 2: Installing The Crankshaft Sprocket Using J 5590
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4. Rotate the crankshaft until the crankshaft sprocket alignment mark is at the 12 o'clock position.
IMPORTANT: Install the camshaft sprocket with the alignment mark at the 6 o'clock position.
5. Install the camshaft sprocket and the camshaft timing chain.
Fig 3: Installing Camshaft Sprocket & Timing Chain
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6. Look to ensure that the crankshaft sprocket is aligned at the 12 o'clock position and camshaft sprocket is aligned at the 6 o'clock position.
Fig 4: View Of Camshaft & Crankshaft Sprocket Timing Marks
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NOTE: Refer to Fastener Notice in Cautions and Notices.
IMPORTANT: Do not use a hammer to install the camshaft sprocket onto the camshaft. To do so may dislodge the expansion cup plug, camshaft rear bearing hole.
7. Install camshaft sprocket bolts.

   Tighten:  Tighten the camshaft sprocket bolts to 25 N.m (18 lb ft).

Fig 5: Installing Camshaft Sprocket Bolts
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8. Install the timing chain tensioner bracket and bolt (227 and 228).

   Tighten:  Tighten the timing chain tensioner bracket bolt to 12 N.m (106 lb in).

IMPORTANT: The timing chain tensioner shoe snaps onto the tensioner bracket. Ensure that the shoe is fully seated before proceeding.
9. Install the timing chain tensioner shoe (229) using an upwards motion.
Fig 6: Installing Timing Chain Tensioner Bracket, Bolt & Shoe
Courtesy of GENERAL MOTORS CORP.
10. Install the crankshaft position sensor reluctor ring.
    1. Align the keyway on the crankshaft position sensor reluctor ring with the crankshaft balancer key in the crankshaft.
    2. Use the J 5590  in order to push the crankshaft position sensor reluctor ring onto the crankshaft until completely seated against the crankshaft sprocket.
Fig 7: Using J 5590 To Push The Crankshaft Position Sensor Reluctor Ring Onto The Crankshaft
Courtesy of GENERAL MOTORS CORP.