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Oil Pump: Inspection

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
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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
  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.)

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

Fig 3: Measuring Clearance Of Oil Pump Assembly
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.)

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
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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.)

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
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002