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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1020 (Engine Mechanical - 6.6L (LLY)) >> Repair Instructions >> Off-Vehicle Repair Instructions >> Engine Block Cleaning and Inspection

Engine Block Cleaning and Inspection

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. Remove the engine block heater.
    2. Fig 1: View Of Engine Block Heater
    GM1336124Courtesy of GENERAL MOTORS CORP.
  2. Remove the O-ring from the block heater and discard.
  3. Remove the oil gallery plugs.
    4. Fig 2: View Of Oil Gallery Plugs
    GM663096Courtesy of GENERAL MOTORS CORP.
  4. Remove the left engine mount bolts.
  5. Remove the left engine mount.
    6. Fig 3: View Of Left Engine Mount
    GM881734Courtesy of GENERAL MOTORS CORP.
  6. Remove the right engine mount bolts.
  7. Remove the right engine mount.
    8. Fig 4: View Of Right Engine Mount
    GM663100Courtesy of GENERAL MOTORS CORP.
  8. Clean the sealing material from the gasket mating surfaces of the block.
  9. Clean the block in cleaning solvent.
  10. Flush the engine block with clean water or steam.
  11. Clean the oil passages.
  12. Clean the cylinder bores.
  13. Inspect the block for cracks. Use the Magnaflux Spot check dye method, or the equivalent.
    • Inspect the cylinder walls.
    • Inspect the coolant jackets.
    • Inspect the crankshaft bearing webs.
  14. Inspect the crankshaft bearing bores and caps. The crankshaft bearing bore inside diameters should be round and uniform at all of the bearing supports.
    15. Fig 5: View of Crankshaft Caps
    GM663103Courtesy of GENERAL MOTORS CORP.
  15. Inspect the area where the crankshaft bearing inserts contact the crankshaft bearing bore. This area must be free of burrs and scratches.
  16. Inspect the engine mount bosses.
  17. Inspect the cylinder head gasket mating surfaces for pitting.
  18. Inspect the engine block to cylinder head gasket surface area for warping. Use a straight edge and feeler gauge. Replace the block if it is warped more than 0.15 mm (0.006 in) longitudinally or more than 0.08 mm (0.003 in) transversely.
    19. Fig 6: Inspecting Engine Block To Cylinder Head Gasket Surface For Warping
    GM35209Courtesy of GENERAL MOTORS CORP.
  19. Apply sealer to the oil gallery plugs.
    20. NOTE: Refer to Fastener Notice in Cautions and Notices.
  20. Install the oil gallery plugs.

    Tighten:  Tighten the oil gallery plugs to 53 N.m (39 lb ft).

    21. Fig 7: View Of Oil Gallery Plugs
    GM663096Courtesy of GENERAL MOTORS CORP.
  21. Install the left engine block coolant plugs.

    Tighten:  Tighten the left engine block coolant plugs to 18 N.m (13 lb ft).

    22. Fig 8: View Of Left Engine Block Coolant Plugs
    GM1336125Courtesy of GENERAL MOTORS CORP.
  22. Install the right engine block coolant plugs.

    Tighten:  Tighten the right engine block coolant plugs to 18 N.m (13 lb ft).

    23. Fig 9: View Of Right Engine Block Coolant Plugs
    GM1397816Courtesy of GENERAL MOTORS CORP.
  23. Install the left engine mount and engine mount bolts.

    Tighten:  Tighten the engine mount bolts to 58 N.m (43 lb ft).

    24. Fig 10: View Of Left Engine Mount
    GM881734Courtesy of GENERAL MOTORS CORP.
  24. Install the right engine mount and engine mount bolts.

    Tighten:  Tighten the right engine mount bolts to 58 N.m (43 lb ft).

    25. Fig 11: View Of Right Engine Mount
    GM663100Courtesy of GENERAL MOTORS CORP.
  25. Install a new O-ring to the block heater.
  26. Lubricate the O-ring with engine coolant.
  27. Install the engine block heater.
    28. Fig 12: View Of Engine Block Heater
    GM1336124Courtesy of GENERAL MOTORS CORP.
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