GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Chevy P12 Chassis 🢒 Engine 🢒 Engine Mechanical - 7.4L 🢒 Crankshaft Rear Oil Seal Replacement

Removal Procedure

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  1. Disconnect the battery negative cable from the battery.
  2. Raise the vehicle and support with safety stands. Refer to Lifting and Jacking the Vehicle in General Information.
  3. Remove the transmission from the vehicle. Refer to Transmission Replacement in Automatic Transmission.
  4. Remove the flywheel from the crankshaft. Refer to Engine Flywheel Replacement .

    5. Object Number: 290963 Size: SH

    Important: When removing the crankshaft rear oil seal from the cylinder block be careful not to nick the crankshaft sealing surface.

  5. Remove the crankshaft rear oil seal from the engine block.
  6. Remove any burrs from the end of the crankshaft.

Installation Procedure

Tools Required

J 38841 Rear Oil Seal Installer


    Object Number: 290963 Size: SH
  1. Install the crankshaft rear oil seal as follows:
    2. 1.1. Lubricate the inner and outer diameter of the crankshaft rear oil seal with clean engine oil.
    1.2. Install the crankshaft rear oil seal onto the J 38841 .
    1.3. Use the J 38841 to install the crankshaft rear oil seal on the crankshaft.
    1.4. Remove the J 38841 from the crankshaft.
  2. Install the flywheel to the crankshaft. Refer to Engine Flywheel Replacement .
  3. Install the transmission. Refer to Transmission Replacement in Automatic Transmission.
  4. Remove the safety stands and lower the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

    5. Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  5. Connect the negative battery cable.