Visual Inspection

Camshaft Position Actuator

Fig 1: Front Of Right Exhaust Camshaft Position Actuators Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
1. Inspect the front of the right exhaust camshaft position actuators for the following:
   • Sprocket damage (1)
   • Loose or missing housing bolts (2)
   • Camshaft position actuator bolt seating/sealing inner hub flange damage (3)
Fig 2: Back Of Right Exhaust Camshaft Position Actuators Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
2. Inspect the back of the right 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)
Fig 3: Front Of Right Intake Camshaft Position Actuators Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
3. Inspect the front of the right intake camshaft position actuators for the following:
   • Sprocket damage (1)
   • Camshaft position actuator oil control valve bolt seating/sealing inner hub flange damage (2)
Fig 4: Back Of Right Intake Camshaft Position Actuators Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
4. Inspect the back of the right intake camshaft position actuators for the following:
   • Sprocket damage (1)
   • Camshaft locating pin damage (2)
   • Blockage to the oil passages (3)
   • Loose or missing housing bolts (4)
Fig 5: Front Of Left Exhaust Camshaft Position Actuators Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
5. Inspect the front of the left exhaust camshaft position actuators for the following:
   • Sprocket damage (1)
   • Loose or missing housing bolts (2)
   • Camshaft position actuator bolt seating/sealing inner hub flange damage (3)
Fig 6: Back Of Left Exhaust Camshaft Position Actuators Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
6. Inspect the back of the left 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)
Fig 7: Front Of Left Intake Camshaft Position Actuators Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
7. Inspect the front of the left intake camshaft position actuators for the following:
   • Sprocket damage (1)
   • Camshaft position actuator oil control valve bolt seating/sealing inner hub flange damage (2)
Fig 8: Back Of Left Intake Camshaft Position Actuators Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
8. Inspect the back of the left intake camshaft position actuators for the following:
   • Sprocket damage (1)
   • Camshaft locating pin damage (2)
   • Blockage to the oil passages (3)
   • Loose or missing housing bolts (4)
9. Replace a damaged camshaft position actuator.

Camshaft Position Actuator Solenoid Valve

Fig 9: Camshaft Position Actuator Solenoid Valves Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
1. Inspect the camshaft position actuator solenoid 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 solenoid valve solenoid oil seal (4)
   • Damage to the wiring harness connection and/or terminals (5)
   • Damage to the bracket (6)
Fig 10: Camshaft Position Actuator Solenoid Valves Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
2. Inspect the camshaft position actuator solenoid 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 bracket (4)
   • Damage to the wiring harness connection and/or terminals (5)
3. Replace a damaged camshaft position actuator solenoid valve.

Camshaft Position Sensor

Fig 11: Camshaft Position Sensor Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
1. Inspect the camshaft position sensor for the following:
   • Damage to the camshaft position sensor (1)
   • Damage to the sealing surface for the camshaft position sensor (2)
   • Damage to the wiring harness connection and/or terminals (3)
   • Damage to the bracket (4)
2. Replace a damaged camshaft position sensor.

Crankshaft Sprocket

Fig 12: Crankshaft Sprocket Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
1. Inspect the crankshaft sprocket for the following:
   • Sprocket damage (1)
   • Bore damage (2)
   • Keyway damage (3)
2. Replace a damaged crankshaft sprocket.

Crankshaft Sprocket

Fig 13: Crankshaft Sprocket Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
1. Inspect the crankshaft sprocket for the following:
   • Sprocket damage (1)
   • Bore damage (2)
   • Keyway damage (3)
2. Replace a damaged crankshaft sprocket.

Oil Pump Sprocket

Fig 14: Crankshaft Sprocket Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
1. Inspect the crankshaft sprocket for the following:
   • Sprocket damage (1)
   • Bore damage (2)
   • Bore damage (3)
   • Keyway damage (4)
2. Replace a damaged crankshaft sprocket.

Timing Chains with Inverted Tooth (IT) Chain

Fig 15: Primary And Secondary Timing Chain Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
1. Inspect the timing chain for the following:
   • Binding or worn links (1)
   • Loose links (2)
   • Loose pins (3)
2. Replace a damaged timing chain.

Timing Chain Guide

Fig 16: Timing Chain Guide Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
1. Inspect the timing chain 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.

Timing Chain Guide

Fig 17: Timing Chain Guide Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
1. Inspect the timing chain 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.

Timing Chain Tensioner

Fig 18: Timing Chain Tensioner Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
1. Inspect the timing chain tensioner for worn timing chain tensioner surface (1).
2. Inspect the timing chain tensioner for worn timing chain tensioner spring (2).
3. Inspect the timing chain tensioner for locked or binding timing chain tensioner. Reset the plunger (4) and ensure the plunger moves freely (3) in and out of the body of the tensioner. Refer to Camshaft Timing Chain Components Installation (LGX) .
4. Replace a damaged primary timing chain tensioner.

Timing Chain Guide

Fig 19: Timing Chain Guide Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
1. Inspect the timing chain 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.

Timing Chain Guide

Fig 20: Timing Chain Guide Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
1. Inspect the timing chain 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.

Timing Chain Tensioner

Fig 21: Timing Chain Tensioner Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
1. Inspect the timing chain tensioner for worn timing chain tensioner surface (1).
2. Inspect the timing chain tensioner for worn timing chain tensioner spring (2).
3. Inspect the timing chain tensioner for locked or binding timing chain tensioner. Reset the plunger (4) and ensure the plunger moves freely (3) in and out of the body of the tensioner. Refer to Camshaft Timing Chain Components Installation (LGX) .
4. Replace a damaged primary timing chain tensioner.

Timing Chain Tensioner

Fig 22: Timing Chain Tensioner Inspection Locations
Courtesy of GENERAL MOTORS COMPANY
1. Inspect the timing chain tensioner for worn timing chain tensioner surface (1).
2. Cracked or broken tensioner surface (2)
3. Inspect the timing chain tensioner for worn timing chain tensioner spring (3).
4. Replace a damaged primary timing chain tensioner.