Sienna 1998-1999

Oil Pump


Removal & Installation

  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  3. Remove or disconnect the following:
    Make a note of the position of the each bolt. When replacing the bolts into the oil pump body, place each bolt in the position from which it was removed.

    Oil pan
    Crankshaft Position (CKP) sensor
    9 oil pump bolts

    Oil pump body, by prying between the oil pump and main bearing cap
    O-ring from the cylinder block
    Plug, gasket, spring and relief valve from the oil pump body
    9 screws, pump body cover, drive and driven rotors


To install:

  1. Install or connect the following:

    Driven rotors, drive, pump body cover, using the 9 screws
    Oil pump relief valve, spring, gasket and the plug to the oil pump body
    New O-ring on the cylinder block

  3. Using a non residue solvent, clean both sealing surfaces to the oil pump.
  5. Apply liquid sealant to the oil pump and engine block.
  7. Install or connect the following:
    Be sure to engage the spline teeth of the oil pump drive gear with the large teeth of the crankshaft.

    Oil pump

    9 oil pump bolts. Tighten the bolts in several passes to 69 inch lbs. (8 Nm), for 10mm or to 14 ft. lbs. (20 Nm), for 12mm.
    CKP sensor. Tighten the bolt to 69 inch lbs. (8 Nm).
    Baffle plate to the No. oil pan. Tighten to 69 inch lbs. (8 Nm).
    No. 1 oil pan, oil strainer and No. 2 oil pan

  9. Refill the engine with oil.
  11. Start the engine and inspect for leaks.
  13. Recheck the engine oil level.