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Oil Pump: Inspection

  1. INSPECT FRONT OIL PUMP BODY SUB-ASSEMBLY 
    1. Using a dial indicator, measure the inside diameter of the oil pump body bushing.

      Maximum inside diameter: 

      38.138 mm (1.5015 in.) 

      If the inside diameter is greater than the maximum inside diameter, replace the oil pump body.

    Fig 1: Measuring Inside Diameter Of Oil Pump Body Bushing
    G05295055Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT STATOR SHAFT ASSEMBLY 
    1. Using a dial indicator, measure the inside diameter of the stator shaft bushing.

      Maximum inside diameter: 

      Front side: 

      21.527 mm (0.8475 in.) 

      Rear side: 

      32.03 mm (1.261 in.) 

      If the inside diameter is greater than the maximum inside diameter, replace the stator shaft.

    Fig 2: Measuring Inside Diameter Of Stator Shaft Bushing
    G05295056Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT CLEARANCE OF OIL PUMP ASSEMBLY 
    1. Push the driven gear to one side of the body.
    2. Using a feeler gauge, measure the clearance.

      Standard body clearance: 

      0.10 to 0.17 mm (0.0039 to 0.0067 in.) 

      If the body clearance is greater than the standard clearance, check the drive gear, the driven gear and the pump body.

      Fig 3: Measuring Oil Pump Body Clearance
      G05295057Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Using a feeler gauge, measure the clearance between the driven gear teeth and the drive gear teeth.

      Standard tip clearance: 

      0.070 to 0.150 mm (0.0028 to 0.0059 in.) 

      If the tip clearance is greater than the standard clearance, check the drive gear, the driven gear and the pump body.

      Fig 4: Measuring Clearance Between Driven Gear Teeth And Drive Gear Teeth
      G05295058Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Using a steel straight edge and a feeler gauge, measure the side clearance of both gears.

      Standard side clearance: 

      0.03 to 0.05 mm (0.0012 to 0.002 in.) 

    5. There are 7 different thicknesses for the drive and driven gears.

      Drive and driven gears thickness 

      DRIVE AND DRIVEN GEARS THICKNESS SPECIFICATION

      Mark Thickness
      0 10.736 to 10.742 mm (0.42268 to 0.42291 in.)
      1 10.743 to 10.749 mm (0.42296 to 0.42319 in.)
      2 10.750 to 10.756 mm (0.42323 to 0.42346 in.)
      3 10.757 to 10.763 mm (0.42350 to 0.42374 in.)
      4 10.764 to 10.770 mm (0.42378 to 0.42401 in.)
      5 10.771 to 10.777 mm (0.42405 to 0.42429 in.)
      6 10.778 to 10.784 mm (0.42433 to 0.42457 in.)

      If the side clearance is greater than the standard thickness, check the drive gear, the driven gear and the pump body.

    Fig 5: Measuring Side Clearance Of Both Gears
    G05295059Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT OIL PUMP DRIVE GEAR ROTATION 
    1. Make sure that the drive gear rotates smoothly.
    2. Remove the oil pump assembly from the torque converter.
    Fig 6: Inspecting Oil Pump Drive Gear Rotation
    G05295060Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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