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The rotary oil pump that supplies the force-feed lubricating oil circuit is positioned at the front of the cylinder block and driven by the crankshaft drive gear. ‪

Oil Pump Removal

Remove the oil pump as follows: ‪

  1. Remove the vibration damper. Refer to section .
  2. Remove the oil pan from the crankcase. Refer to section .
  3. Remove the dipstick guide tube and bracket at the suction pipe. See Figure 42445 .

    1. Oil Pump ‪

    7. Bracket (Suction Pipe) ‪

    2. O-ring ‪

    8. Suction Pipe ‪

    3. Dowel Pin ‪

    9. Radial Seal ‪

    4. Connection Fitting ‪

    10. Oil Pump to Cylinder Block Bolt ‪

    5. Drive Gear ‪

    11. Suction Pipe to Oil Pump Bolt ‪

    6. Dipstick Guide Tube ‪

    12. Suction Pipe Bracket Bolt ‪

    Oil Pump Removal

  4. Remove the suction pipe.
  5. Remove the oil pump using care not to damage the sealing surface.
  6. Remove the radial seal and the O-ring at the connection fitting.
  7. Thoroughly clean the contact surfaces of the oil pump.

Oil Pump Installation

Install the oil pump as follows: ‪

  1. Install a new O-ring at the connection fitting.
  2. Using the front seal installer J-46388 , press in the radial seal. Make sure the seal is evenly installed around the entire circumference of the oil pump. Check the setback of the seal. See Figure 42446 .

    1. Radial Seal ‪

    4. Connection Fitting ‪

    2. Oil Pump ‪

    5. Guide Sleeve ‪

    3. Base ‪

    6. Dowel Pin ‪

    Checking the Radial Seal

  3. Coat the contact surface between the block and the oil pump with Loctite 574.
  4. Position the front seal installer J-46388 guide sleeve on the crankshaft flange and install the oil pump. Pay special attention to the dowel pin and the position of the drive gear. Tighten the oil pump to crankcase bolts 25 Nm (18 lbft). Remove the guide sleeve.

    Note: It may be necessary to rock the pump counterclockwise so the teeth of the gear can properly align with the crankshaft drive gear.

  5. Install the suction pipe and tighten the fasteners 25 Nm (18 lbft).
  6. Install the bracket and the dipstick guide tube on the suction pipe. Tighten the suction pipe bracket bolt 50 Nm (37 lbft).
  7. Install the oil pan with a new gasket.
  8. Install the vibration damper. Refer to section .
  9. Fill the engine with the correct amount and appropriate type of clean engine oil. Do not overfill.


    To avoid injury before starting and running the engine, ensure the vehicle is parked on a level surface, parking brake is set, and the wheels are blocked.


    Diesel engine exhaust and some of its constituents are known to the State of California to cause cancer, birth defects, and other reproductive harm.

    • Always start and operate an engine in a well ventilated area.
    • If operating an engine in an enclosed area, vent the exhaust to the outside.
    • Do not modify or tamper with the exhaust system or emission control system.
  10. Start the engine and check for leaks.
  11. Check the engine oil level and add oil if necessary.