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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 Front Cover Replacement >> Installation Procedure

Installation 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. Install a NEW crankshaft front oil seal using J 42851  .
  2. Lubricate the sealing surface of the crankshaft front oil seal with clean engine oil.
    IMPORTANT: The engine front cover must be installed and the fasteners tightened while the sealant is still wet to the touch.
  3. Apply sealant GM P/N 12346286 (Canadian P/N 10953472) or equivalent in 2 places (1) on the engine block where the front cover meets the oil pan.
    4. Fig 1: View Of Sealant At Front Cover To Oil Pan Junction
    GM470807Courtesy of GENERAL MOTORS CORP.
  4. Install the engine front cover gasket into the front cover.
    IMPORTANT: The following method must be used when installing the engine front cover. Failure to follow the instructions will push the sealant out, which may cause an oil leak.
  5. Install the front cover and gasket.
    1. Hold the front cover (1) up to the crankshaft (2).
    2. Lift the front cover (1) while sliding the cover over the crankshaft (2).
    3. Slide the front cover towards the engine block (5) while keeping the cover raised.
    4. Lower the cover down over the dowel pin (4), allowing the front cover to rest on the sealant (3).
    6. Fig 2: View Of Front Cover & Gasket Proper Installation Position
    GM719124Courtesy of GENERAL MOTORS CORP.
  6. Install the engine front cover bolts.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  7. Tighten the engine front cover bolts.

    Tighten: 

    1. Tighten the engine front cover bolts in sequence a first pass to 6 N.m (53 lb in).
    2. Tighten the engine front cover bolts in sequence a final pass to 12 N.m (106 lb in).

    8. Fig 3: Crankshaft Front Cover Bolt Tightening Sequence
    GM677874Courtesy of GENERAL MOTORS CORP.
  8. Position the battery cable channel into place.
  9. Install the battery cable channel bolt.

    Tighten:  Tighten the battery cable channel bolt to 9 N.m (80 lb in).

    Fig 4: View Of Battery Cable Channel Bolt
    GM1236368Courtesy of GENERAL MOTORS CORP.
  10. Inspect the CMP sensor O-ring for cuts, cracks, tears or damage. Replace as needed.
  11. Apply a light film of clean engine oil to the CMP sensor O-ring.
  12. Install the CMP sensor.

    Install the CMP sensor bolt.

    Tighten:  Tighten the CMP sensor bolt to 12 N.m (106 lb in).

    13. Fig 5: View Of CMP Sensor
    GM470803Courtesy of GENERAL MOTORS CORP.
  13. Install the engine harness clips to the battery cable channel.
  14. Connect the CMP sensor electrical connector (1).
    15. Fig 6: View Of CMP Sensor Electrical Connector Battery Cable Channel Engine Harness Clips
    GM750902Courtesy of GENERAL MOTORS CORP.
  15. Install the crankshaft balancer. Refer to Crankshaft Balancer Replacement .
  16. Install the water pump. Refer to Water Pump Replacement (8.1L) in Engine Cooling.
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