GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Express 🢒 Engine 🢒 Engine Mechanical - 7.4L 🢒 Oil Filter Adapter and Bypass Valve Assembly Replacement

Removal Procedure
  1. Open the hood.

    2. Caution: Before servicing any electrical component, the ignition and start switch must be in the OFF or LOCK position and all electrical loads must be OFF, unless instructed otherwise in these procedures. If a tool or equipment could easily come in contact with a live exposed electrical terminal, also disconnect the negative battery cable. Failure to follow these precautions may cause personal injury and/or damage to the vehicle or its components.

  2. Disconnect the battery negative cable from the battery.
  3. Raise the vehicle and support with safety stands. Refer to Vehicle Lifting and Jacking in General Information.

    4. Object Number: 181988 Size: SH
  4. Remove the oil filter from the oil filter adapter. Refer to Engine Oil and Oil Filter Replacement .
  5. Remove the oil filter adapter from the engine block. Refer to Engine Oil and Oil Filter Replacement .
  6. Remove the oil filter bypass valve from the engine block. Refer to Oil Filter Adapter Removal .

Installation Procedure
  1. Install the bypass valve in the engine block. Refer to Oil Filter Adapter Installation .

    2. Object Number: 181988 Size: SH
  2. Install the oil filter adapter to the engine block. Refer to Oil Filter Adapter Installation .
  3. Install the oil filter to the adapter. Refer to Engine Oil and Oil Filter Replacement .
  4. Remove the safety stands and lower the vehicle. Refer to Vehicle lifting and Jacking in General Information.
  5. Connect the battery negative cables to the battery. Refer to Battery Cable Replacement .
  6. Close the hood.