GM Service Manual Online
For 1990-2009 cars only
  1. Pry the old oil seal from the front cover and discard.
  2. Clean the front cover in a commercially available cleaning fluid and blow dry with compressed air.
  3. Inspect the front cover sealing surfaces for excessive scratches and/or gouges.
  4. Inspect the front cover gasket for damage to the membrane or distortion to the aluminium carrier.
  5. Inspect the front cover to oil pan threaded holes for damaged threads or debris, refer to Thread Repair if rectification is required.
  6. Inspect the front cover crankshaft oil seal bore for damage.