GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Blazer - 2WD 🢒 Engine 🢒 Engine Mechanical - 4.3L 🢒 Oil Filter Bypass Valve Replacement

Removal Procedure
  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Position a suitable container to catch the engine oil.
  3. Remove the oil filter (2WD vehicle).
  4. Remove the oil filter adapter. Refer to Oil Filter Adapter Replacement .

    5. Object Number: 519269 Size: SH
  5. Using a suitable prying tool remove the oil filter bypass valve.
  6. Clean and inspect valve bore for damage.

Installation Procedure

    Object Number: 519270 Size: SH
  1. Install a NEW oil filter bypass valve using the following procedure:
    2. 1.1. Use a brass drift that is the same diameter as the outside diameter of the oil filter bypass valve.
    1.2. Install the oil filter bypass valve into the oil gallery bore until slightly below flush with the surface of the engine block.
    1.3. Using a pointed punch, stake the engine block area around the oil filter bypass valve.

    Stake in 3 locations 120 degrees apart.

  2. Install the oil filter adapter (RWD vehicle) or the remote oil filter pipe adapter (4WD vehicle). Refer to Oil Filter Adapter Replacement .
  3. Install the oil filter (RWD vehicle). Refer to Engine Oil and Oil Filter Replacement .
  4. Lower the vehicle.