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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1352 (Engine Mechanical - 1.8L (LV6)) >> Repair Instructions >> On-Vehicle Repair Instructions >> Timing Chain and Sprockets Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 Pontiac Vibe. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: Identifying Serpentine Drive Belt Routing
    GM244267Courtesy of GENERAL MOTORS CORP.
  1. Remove the accessory drive belt. Refer to Drive Belt Replacement .
  2. Remove the generator from the engine. Refer to Generator Replacement in Engine Electrical.
    3. CAUTION: Refer to Battery Disconnect Caution
  3. Disconnect the negative battery cable.
  4. Drain the cooling system. Refer to Draining and Filling Cooling System in Engine Cooling.
  5. Install the engine support fixture. Refer to Engine Support Fixture .
  6. Remove the engine mount and engine mounting bracket. Refer to Engine Mount Replacement .
  7. Remove the cylinder head cover. Refer to Cylinder Head Cover Replacement .
    8. Fig 2: Engine Top Dead Center
    GM234138Courtesy of GENERAL MOTORS CORP.
  8. Set the number 1 piston to the top dead center (TDC) position.
  9. Align the camshaft timing sprockets.
  10. Disconnect the power steering oil pressure switch connector.
  11. Raise and properly support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  12. Remove the right engine splash shield. Refer to Splash Shield Replacement - Engine - Left in Body Front End.
    13. Fig 3: Power Steering Pump Nuts And Bolts
    GM236875Courtesy of GENERAL MOTORS CORP.
  13. Remove the 2 power steering pump through bolts and the nuts (1).
  14. Remove the power steering pump from the mounting surface.

    Move the pump to the side.

    15. Fig 4: Pinion Flange Holder
    GM234153Courtesy of GENERAL MOTORS CORP.
  15. Remove the crankshaft pulley retaining bolt using J 8614-01  .
  16. Remove the crankshaft pulley.
    17. Fig 5: Lower Drive Belt Tensioner Bolt
    GM234378Courtesy of GENERAL MOTORS CORP.
  17. Remove the following components:
    • The crankshaft position sensor bolt (5)
    • The sensor
  18. Lower the vehicle.
  19. Remove the following components from the mounting surface:
    • The drive belt tensioner bolt
    • The drive belt tensioner nut
    • The drive belt tensioner
    20. Fig 6: Timing Chain Tensioner Bolts
    GM234178Courtesy of GENERAL MOTORS CORP.
  20. Remove the timing chain tensioner bolts (1, 2).
  21. Remove the timing chain tensioner.
    22. Fig 7: Timing Chain Cover Bolts And Nuts
    GM234182Courtesy of GENERAL MOTORS CORP.
  22. Remove the following fasteners:
    • The timing chain cover bolts (1-14)
    • The timing chain cover nut (15)
  23. Remove the timing chain cover.
    24. Fig 8: Crankshaft Sensor Reluctor
    GM234359Courtesy of GENERAL MOTORS CORP.
  24. Remove the crankshaft sensor reluctor (1).
    25. Fig 9: Timing Chain Dampener Bolt, Dampener And Shoe Bolts
    GM625486Courtesy of GENERAL MOTORS CORP.
  25. Remove the following components:
    • The timing chain dampener bolt (1)
    • The timing chain dampener
    • The timing chain shoe bolts (2)
    • The timing chain shoe
    26. Fig 10: Removing Timing Chain And Crankshaft Sprocket
    GM234188Courtesy of GENERAL MOTORS CORP.
  26. Remove the following components:
    • The crankshaft sprocket
    • The timing chain
  27. Remove the three bolts from the front camshaft bearing cap.
  28. Remove the front camshaft bearing cap in order to access the oil passage to the camshaft position (CMP) actuator.
    29. Fig 11: Air Pressure To Camshaft
    GM652440Courtesy of GENERAL MOTORS CORP.
  29. Ensure that the CMP actuator will not turn.
  30. Apply air pressure of approximately 100 kPa (14 psi) to the advance passage of the camshaft.
  31. Turn the CMP actuator to the advanced angle side by hand.
  32. Rotate the actuator back and forth through the advanced positions to ensure 21 degrees of movement.
  33. Remove the air pressure and turn the CMP actuator back to the minimum advanced angle position to lock it.
  34. Replace the CMP actuator if the following conditions exist:
    • CMP actuator does not lock with air pressure removed.
    • CMP actuator does not unlock with air pressure applied.
    • CMP actuator does not rotate smoothly through the advanced positions.
    • CMP actuator does not rotate completely through the advance positions.
  35. Install the front camshaft bearing cap.
    36. NOTE: Refer to Fastener Notice in Cautions and Notices.
  36. Install the front camshaft bearing cap bolts.

    Tighten:  Tighten the camshaft bearing cap bolts to 23 N.m (17 lb ft).

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