GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1998 🢒 GMC Suburban - 4WD 🢒 Engine 🢒 Engine Mechanical - 7.4L 🢒 Crankshaft Rear Oil Seal 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. Refer to Battery Cable in Engine Electrical.
  3. Raise the vehicle and support with safety stands. Refer to Lifting and Jacking the Vehicle in General Information.
  4. Remove the transmission from the vehicle.
    5. • For the automatic transmission. Refer to Transmission Replacement or Transmission Replacement in Transmission/Transaxle.
    • For the manual transmission. Refer to Transmission Replacement in Transmission/Transaxle.
  5. Remove the clutch from the crankshaft if equipped. Refer to Clutch Assembly Replacement in Clutch.
  6. Remove the flywheel from the crankshaft. Refer to Engine Flywheel Replacement .

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

  7. Remove the crankshaft rear oil seal from the engine block.

Installation Procedure

Tools Required

J 38841 Rear Oil Seal Installer

  1. Install the crankshaft rear oil seal as follows:
    2. • Lubricate the inner and outer diameter of the crankshaft rear oil seal with clean engine oil.
    • Install the crankshaft rear oil seal the J 38841 .
    • Use the J 38841 to install the crankshaft rear oil seal on the crankshaft.
    • Remove the J 38841 from the crankshaft.
  2. Install the flywheel to the crankshaft. Refer to Engine Flywheel Replacement .
  3. Install the clutch to the crankshaft if equipped. Refer to Clutch Assembly Replacement in Clutch.
  4. Install the transmission to the engine block.
    5. • For the automatic transmission. Refer to Transmission Replacement or Transmission Replacement in Transmission/Transaxle.
    • For the manual transmission. Refer to Transmission Replacement in Transmission/Transaxle.
    • Lower the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  5. Connect the battery negative cables to the battery. Refer to Battery Cable in Engine Electrical.
  6. Close the hood.