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Oil Pump: Inspection

INSPECT FRONT OIL PUMP BODY SUB-ASSEMBLY
1. Using a caliper gauge, measure the inside diameter of the oil pump body bushing.
  Maximum inside diameter: 38.188 mm (1.5035 in.)
  
  If the inside diameter is greater than the maximum, replace the oil pump body.
  
  Fig 1: Measuring Inside Diameter Of Oil Pump Body Bushing
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT STATOR SHAFT ASSEMBLY
1. Using a caliper gauge, measure the inside diameter of the stator shaft bushing.
  Maximum inside diameter:
  
  Front side: 21.577 mm (0.8495 in.)
  
  Rear side: 32.08 mm (1.2629 in.)
  
  If the inside diameter is grater than the maximum, replace the stator shaft.
  
  Fig 2: Measuring Inside Diameter Of Stator Shaft Bushing
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT CLEARANCE OF OIL PUMP ASSEMBLY

Push the driven gear to one side of the body.
Using a feeler gauge, measure the clearance.
Standard body clearance: 0.10 to 0.17 mm (0.0039 to 0.0067 in.)

Maximum body clearance: 0.17 mm (0.0067 in.)

If the body clearance is greater than the maximum, replace the drive gear, driven gear or pump body.

Fig 3: Measuring Clearance
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Using a feeler gauge, measure the clearance between the driven gear teeth and drive gear teeth.
Standard tip clearance: 0.070 to 0.150 mm (0.0028 to 0.0059 in.)

Maximum tip clearance: 0.150 mm (0.0059 in.)

If the tip clearance is greater than the maximum, replace the drive gear, driven gear or pump body.

Fig 4: Measuring Clearance Between Driven Gear Teeth And Drive Gear Teeth
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Using a steel straightedge and feeler gauge, measure the side clearance of both gears.
Standard side clearance: 0.02 to 0.05 mm (0.0008 to 0.002 in.)

Maximum side clearance: 0.05 mm (0.002 in.)

If the side clearance of both is gears greater than the maximum, replace the drive gear, driven gear or pump body.

Fig 5: Measuring Side Clearance Of Both Gears
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard drive and drive gears thickness

THICKNESS CHART

Mark	Thickness
0	10.74 to 10.749 mm (0.4228 to 0.4232 in.)
1	10.75 to 10.759 mm (0.4232 to 0.4236 in.)
2	10.76 to 10.77 mm (0.4236 to 0.4240 in.)
3	10.771 to 10.78 mm (0.4241 to 0.4244 in.)
4	10.781 to 10.79 mm (0.4244 to 0.4248 in.)

If the side clearance is greater than the maximum, replace the drive gear, driven gear or pump body.

INSPECT FRONT OIL PUMP DRIVE GEAR ROTATION
1. Make sure the drive gear rotates smoothly.
2. Remove the oil pump assembly from the torque converter.
  
  Fig 6: Inspecting Front Oil Pump Drive Gear Rotation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002