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Home >> Buick >> 2008 >> Allure CXL >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Engine Mechanical - 3.6L (4 Of 5)) >> Off-Vehicle Repair Instructions (2 Of 3) >> Camshaft Timing Drive Components Cleaning and Inspection (Third Design) >> Visual Inspection

Visual Inspection

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Camshaft Position Actuators

    Fig 1: Identifying Camshaft Position Actuator Inspection Points
    GM1848143Courtesy of GENERAL MOTORS CORP.
  1. Inspect the front of the exhaust camshaft position actuators for the following:
    • Sprocket damage (1)
    • Reluctor/sensor wheel damage (2)
    • Camshaft position actuator bolt seating/sealing inner hub flange damage (3)
    2. Fig 2: Identifying Exhaust Camshaft Position Actuators Inspection Areas
    GM1210932Courtesy of GENERAL MOTORS CORP.
  2. Inspect the back of the exhaust camshaft position actuators for the following:
    • Sprocket damage (1)
    • Camshaft locating pin damage (2)
    • Camshaft seating/sealing inner hub flange damage (3)
    • Blockage to the oil passages (4)
    • Loose or missing housing bolts (5)
    3. Fig 3: Identifying Camshaft Position Actuator Inspection Areas
    GM1848144Courtesy of GENERAL MOTORS CORP.
  3. Inspect the front of the intake camshaft position actuators for the following:
    • Sprocket damage (1)
    • Reluctor/sensor wheel damage (2)
    • Camshaft position actuator oil control valve bolt seating/sealing inner hub flange damage (3)
    4. Fig 4: Identifying Exhaust Camshaft Position Actuators Inspection Areas
    GM1210932Courtesy of GENERAL MOTORS CORP.
  4. Inspect the back of the intake camshaft position actuators for the following:
    • Sprocket damage (1)
    • Camshaft locating pin damage (2)
    • Camshaft seating/sealing inner hub flange damage (3)
    • Blockage to the oil passages (4)
    • Loose or missing housing bolts (5)
  5. Replace a damaged camshaft position actuator.

Camshaft Position Actuator Oil Control Valves

    Fig 5: Identifying Camshaft Position Actuator Oil Control Valves Inspection Areas
    GM1326149Courtesy of GENERAL MOTORS CORP.
  1. Inspect the camshaft position actuator oil control valves for the following:
    • Blockage to the oil passage (1)
    • Missing or damaged oil screen clip (2)
    • Blockage or damage to the oil screen (3)
    • Damage to the sealing surface for the camshaft position actuator oil control valve solenoid oil seal (4)
    • Damage to the bracket (5)
    • Damage to the wiring harness connection and/or terminals (6)
  2. Replace a damaged camshaft position actuator oil control valve.

Left Intermediate Sprocket with Primary Inverted Tooth (IT) Chain

    Fig 6: Checking Front Of Left Intermediate Sprocket Inspection Areas
    GM1545373Courtesy of GENERAL MOTORS CORP.
  1. Inspect the front of the left intermediate sprocket for the following:
    • Damage to the primary camshaft drive chain sprocket (1)
    • Damage to the hub bearing (2)-Ensure the hub bearing spins freely. If the hub bearing wobbles, is noisy, or feels rough when rotated, replace the intermediate sprocket.
    • Damage to the bolt flange seating/sealing surface (3)
    2. Fig 7: Inspecting Back Of Intermediate Sprocket
    GM1545376Courtesy of GENERAL MOTORS CORP.
  2. Inspect the back of the intermediate sprocket for the following:
    • Damage to the left secondary camshaft drive chain sprocket (1)
    • Damage to the bearing hub-to-engine block sealing surface (2)
  3. Replace a damaged left intermediate sprocket.

Right Intermediate Sprocket with Primary Inverted Tooth (IT) Chain

    Fig 8: Identifying Front Of Right Intermediate Sprocket Inspection Areas
    GM1545378Courtesy of GENERAL MOTORS CORP.
  1. Inspect the front of the right intermediate sprocket for the following:
    • Damage to the right secondary camshaft drive chain sprocket (1)
    • Damage to the hub bearing (2)-Ensure the hub bearing spins freely. If the hub bearing wobbles, is noisy, or feels rough when rotated, replace the intermediate sprocket.
    • Damage to the bolt flange seating/sealing surface (3)
    2. Fig 9: Inspecting Back Of Right Intermediate Sprocket
    GM1545379Courtesy of GENERAL MOTORS CORP.
  2. Inspect the back of the right intermediate sprocket for the following:
    • Damage to the primary camshaft drive chain sprocket (1)
    • Damage to the bearing hub-to-engine block sealing surface (2)
  3. Replace a damaged right intermediate sprocket.

Crankshaft Sprocket with Primary Inverted Tooth (IT) Chain

    Fig 10: Checking Crankshaft Sprocket With Primary (IT) Inverted Tooth Chain
    GM1545380Courtesy of GENERAL MOTORS CORP.
  1. Inspect the crankshaft sprocket for the following:
    • Sprocket damage (1)
    • Bore damage (2)
    • Keyway damage (3)
  2. Replace a damaged crankshaft sprocket.

Secondary Timing Chains with Roller Chain

    Fig 11: Inspecting Primary And Secondary Timing Chains With Roller Chain
    GM1285145Courtesy of GENERAL MOTORS CORP.
  1. Inspect the secondary timing chain for the following:
    • Binding or worn rollers (1)
    • Loose links (2)
    • Loose pins (3)
  2. Replace a damaged secondary timing chain.

Primary Timing Chain with Inverted Tooth (IT) Chain

    Fig 12: Identifying Primary Timing Chain With (IT) Inverted Tooth Chain
    GM1545381Courtesy of GENERAL MOTORS CORP.
  1. Inspect the primary timing chain for the following:
    • Binding or worn links (1)
    • Loose links (2)
    • Loose pins (3)
  2. Replace a damaged primary timing chain.

Primary Timing Chain Upper Guide

    Fig 13: Checking Primary Timing Chain Upper Guide
    GM1210923Courtesy of GENERAL MOTORS CORP.
  1. Inspect the primary timing chain upper guide for the following:
    • Worn guide surface (1)
    • Cracked or broken guide surface (2)
    • Cracked or damaged guide base (3)
  2. Replace a damaged primary timing chain upper guide.

Primary Timing Chain Lower Guide

    Fig 14: View Of Primary Camshaft Drive Chain Lower Guide Inspection Locations
    GM1579175Courtesy of GENERAL MOTORS CORP.
  1. Inspect the primary timing chain lower guide for the following:
    • Worn guide surface (1)
    • Cracked or broken guide surface (2)
    • Cracked or damaged guide base (3)
  2. Replace a damaged primary timing chain lower guide.

Left Secondary Timing Chain Guide

    Fig 15: Checking Left Secondary Timing Chain Guide
    GM1326157Courtesy of GENERAL MOTORS CORP.
  1. Inspect the left secondary timing chain guides for the following:
    • Worn guide surface (1)
    • Cracked or broken guide surface (2)
    • Cracked or damaged guide base (3)
  2. Replace a damaged left secondary timing chain guide.

Right Secondary Timing Chain Guide

    Fig 16: Identifying Right Secondary Timing Chain Guide
    GM1326158Courtesy of GENERAL MOTORS CORP.
  1. Inspect the right secondary timing chain guides for the following:
    • Worn guide surface (1)
    • Cracked or broken guide surface (2)
    • Cracked or damaged guide base (3)
  2. Replace a damaged right secondary timing chain guide.

Left Secondary Timing Chain Shoe

    Fig 17: Checking Left Secondary Timing Chain Shoe
    GM1326159Courtesy of GENERAL MOTORS CORP.
  1. Inspect the front of the left secondary timing chain shoe for the following:
    • Worn shoe surface (1)
    • Cracked or broken shoe surface (2)
    • Cracked or damaged shoe (3)
    2. Fig 18: Inspecting Left Secondary Timing Chain Tensioner Contact Pad
    GM1326160Courtesy of GENERAL MOTORS CORP.
  2. Inspect the back of the left secondary timing chain shoe for a damaged, worn, or missing left secondary timing chain tensioner contact pad (1).
  3. Replace a damaged left secondary timing chain shoe.

Right Secondary Timing Chain Shoe

    Fig 19: Identifying Right Secondary Timing Chain Shoe
    GM1326161Courtesy of GENERAL MOTORS CORP.
  1. Inspect the front of the right secondary timing chain shoe for the following:
    • Worn shoe surface (1)
    • Cracked or broken shoe surface (2)
    • Cracked or damaged shoe (3)
    2. Fig 20: Inspecting Right Secondary Timing Chain Tensioner Contact Pad
    GM1326162Courtesy of GENERAL MOTORS CORP.
  2. Inspect the back of the right secondary timing chain shoe for a damaged, worn, or missing right secondary timing chain tensioner contact pad (1).
  3. Replace a damaged right secondary timing chain shoe.

Primary Timing Chain Tensioner

    Fig 21: Checking Primary Timing Chain Tensioner
    GM1210924Courtesy of GENERAL MOTORS CORP.
  1. Inspect the primary timing chain tensioner for worn primary timing chain tensioner shoe surface (1).
  2. Inspect the primary timing chain tensioner for locked or binding timing chain tensioner. Reset the plunger (3) and ensure the plunger moves freely (2) in and out of the body of the tensioner. Refer to Primary Camshaft Drive Chain Tensioner Installation (Fourth Design) .
  3. Replace a damaged primary timing chain tensioner.

Left Secondary Timing Chain Tensioner

    Fig 22: Checking Left Secondary Timing Chain Tensioner
    GM1326164Courtesy of GENERAL MOTORS CORP.
  1. Inspect the left secondary timing chain tensioner for damaged plunger-to-shoe contact surface (1).
  2. Inspect the left secondary timing chain tensioner for locked or binding timing chain tensioner. Reset the plunger (3) and ensure the plunger moves freely (2) in and out of the body of the tensioner. Refer to Secondary Camshaft Drive Chain Tensioner Installation - Left Side (Fourth Design) .
  3. Replace a damaged left secondary timing chain tensioner.

Right Secondary Timing Chain Tensioner

    Fig 23: Inspecting Right Secondary Timing Chain Tensioner
    GM1326165Courtesy of GENERAL MOTORS CORP.
  1. Inspect the right secondary timing chain tensioner for damaged plunger-to-shoe contact surface (1).
  2. Inspect the right secondary timing chain tensioner for locked or binding timing chain tensioner. Reset the plunger (3) and ensure the plunger moves freely (2) in and out of the body of the tensioner. Refer to Secondary Camshaft Drive Chain Tensioner Installation - Right Side (Fourth Design) .
  3. Replace a damaged right secondary timing chain tensioner.
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