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Oil Pump: Inspection

  1. INSPECT OIL PUMP RELIEF VALVE 
    Fig 1: Identifying Oil Pump Relief Valve
    G04975457Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Coat the relief valve with engine oil and check that it falls smoothly into the valve hole under its own weight.

      If the valve does not fall smoothly, replace the relief valve. If necessary, replace the oil pump assembly.

  2. INSPECT OIL PUMP ROTOR SET 
    Fig 2: Identifying Oil Pump Rotor Set
    G04975458Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Install the rotors to the timing chain cover with the rotors' marks facing outward. Check that the rotors revolve smoothly.
    2. Check the tip clearance.
        Fig 3: Measuring Clearance Between Drive Rotor & Driven Rotor Using Feeler Gauge
        G04975459Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Using a feeler gauge, measure the clearance between the drive and driven rotors.

        Tip clearance 

        TIP CLEARANCE REFERENCE

        Standard Maximum
        0.060 to 0.160 mm (0.0024 to 0.0063 in.) 0.16 mm (0.0063 in.)

        If the clearance is greater than the maximum, replace the drive and driven rotors.

    3. Check the side clearance.
        Fig 4: Measuring Side Clearance Between Rotors & Precision Straight Edge Using Feeler Gauge & Straight Edge
        G04975460Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Using a feeler gauge and precision straight edge, measure the clearance between the rotors and precision straight edge.

        Side clearance 

        SIDE CLEARANCE REFERENCE

        Standard Maximum
        0.030 to 0.090 mm (0.0012 to 0.0035 in.) 0.090 mm (0.0035 in.)

        If the side clearance is greater than the maximum, replace the timing chain cover.

    4. Check the body clearance.
        Fig 5: Measuring Body Clearance Between Timing Chain Cover & Driven Rotor Using Feeler Gauge
        G04975461Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Using a feeler gauge, measure the clearance between the timing chain cover and driven rotor.

        Body clearance 

        BODY CLEARANCE REFERENCE

        Standard Maximum
        0.250 to 0.325 mm (0.0098 to 0.0128 in.) 0.325 mm (0.0128 in.)

        If the body clearance is greater than the maximum, replace the timing chain cover.

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