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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1021 (Engine Mechanical - 8.1L) >> Repair Instructions >> On-Vehicle Repair Instructions >> Engine Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Open the hood.
  2. Place fender covers over both fenders.
  3. Raise the hood to the service position, perform the following:
    1. Remove the hood hinge bolts (1).
    2. Raise the hood until vertical.
    3. Install the hood hinge bolts until snug in the service position (2).
    4. Fig 1: Identifying Hood Hinge Normal And Service Position Bolt Holes
    GM310799Courtesy of GENERAL MOTORS CORP.
  4. Loosen the clamps at the throttle body and air cleaner.
  5. Remove the air cleaner outlet duct.
    6. Fig 2: View Of Air Cleaner Outlet Duct
    GM700979Courtesy of GENERAL MOTORS CORP.
  6. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnect/Connect Procedure (Single Battery) or Battery Negative Cable Disconnect/Connect Procedure (Auxiliary Battery) in Engine Electrical.
  7. Disconnect the positive battery cable.
    8. Fig 3: View Of Battery Cables
    GM662092Courtesy of GENERAL MOTORS CORP.
  8. Remove the ignition coils. Refer to Ignition Coil(s) Replacement in Engine Controls - 8.1 L.
  9. Relieve the fuel system pressure. Refer to Fuel Pressure Relief Procedure in Engine Controls - 8.1 L.
  10. Disconnect the fuel feed pipe (1) from the fuel rail. Refer to Quick Connect Fitting(s) Service (Metal Collar) in Engine Controls - 8.1 L.
    11. Fig 4: View Of Fuel Feed Pipe & EVAP Canister Purge Pipe
    GM1238587Courtesy of GENERAL MOTORS CORP.
  11. Remove the air conditioning (A/C) compressor. Refer to Compressor Replacement (L18) in Heating, Ventilation and Air Conditioning.
  12. Remove the radiator. Refer to Radiator Replacement (8.1L) in Engine Cooling.
  13. Disconnect the throttle actuator control (TAC) module electrical connector (1).
    14. Fig 5: View Of TAC Module Electrical Connector
    GM871922Courtesy of GENERAL MOTORS CORP.
  14. Remove the vacuum lines from the engine, as required.
  15. Remove the ground cable bolt at the engine block.
    16. Fig 6: View Of Ground Cable Bolt At Engine Block
    GM663475Courtesy of GENERAL MOTORS CORP.
  16. Remove the generator. Refer to Generator Replacement (8.1L Engine) in Engine Electrical.
  17. Remove the engine electrical harness and tie out of the way.
  18. Raise and suitably support the vehicle safety stands. Refer to Lifting and Jacking the Vehicle in General Information.
  19. Remove the starter motor. Refer to Starter Motor Replacement (8.1L Engine) in Engine Electrical.
  20. Remove the hoses from the power steering pump. Refer to Power Steering Cooler Pipe/Hose Replacement (Without Hydroboost) or Power Steering Cooler Pipe/Hose Replacement (Rack and Pinion) or Power Steering Cooler Pipe/Hose Replacement (With Hydroboost) or Power Steering Cooler Pipe/Hose Replacement (Parellel Hybrid Truck) in Power Steering System.
  21. Remove the exhaust manifold pipe. Refer to Exhaust Manifold Pipe Replacement (6.0L, 6.6L, and 8.1L Engines) in Engine Exhaust.
  22. Remove the catalytic converter. Refer to Catalytic Converter Replacement (6.0L and 8.1L Engines) in Engine Exhaust.
  23. Remove the torque converter bolts, if equipped.
  24. Remove the clutch pressure plate bolts, if equipped.
  25. Remove the bolts from the transmission to the engine.
    26. Fig 7: Identifying Six Studs & One Bolt Securing Transmission To Engine
    GM394446Courtesy of GENERAL MOTORS CORP.
  26. Remove the engine oil cooler lines from the engine block. Refer to Engine Oil Cooler Hose/Pipe Replacement (2WD) or Engine Oil Cooler Hose/Pipe Replacement (4WD) in Engine Cooling.
  27. Attach J 36857  to the rear of the right cylinder head and to the front of the left cylinder head.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
    28. Fig 8: View Of J 36857 At Right Cylinder Head
    GM66457Courtesy of GENERAL MOTORS CORP.
  28. Install the attaching bolt and washer. Use GM P/N 9428217 with GM P/N 15650963.

    Tighten:  Tighten the lift bracket bolts to 40 N.m (30 lb ft).

  29. Remove the engine mount heat shield bolts and shields.
    30. Fig 9: View Of Engine Mount Heat Shield
    GM750194Courtesy of GENERAL MOTORS CORP.
  30. Remove the engine mount to engine mount bracket bolts.
    31. Fig 10: View Of Engine Mount-To-Engine Mount Bracket
    GM750192Courtesy of GENERAL MOTORS CORP.
  31. Remove the engine using a suitable lifting devise.
  32. Install the engine onto a suitable engine stand.
  33. Remove the generator mounting bracket. Refer to Generator Bracket Replacement (8.1L Engine) in Engine Electrical.
  34. Remove the A/C compressor/power steering pump bracket from the cylinder head.
    35. Fig 11: View Of A/C Compressor/Power Steering Pump Bracket
    GM746257Courtesy of GENERAL MOTORS CORP.
  35. Remove the lift brackets from the cylinder head.
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