Oil Pump: Inspection

INSPECT OIL JET
1. Apply air pressure to the path shown in the illustration, then check the oil jet for damage or clogging.
  If the air does not blow out from the oil jet, replace the oil pump.
  
  Fig 1: Checking Oil Jet
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT OIL PUMP RELIEF VALVE
1. Coat the oil pump relief valve with engine oil, then check that it falls smoothly into the valve hole by its own weight.
  If this does not occur, replace the oil pump.
  
  Fig 2: Checking Oil Pump Relief Valve
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT OIL PUMP ROTOR
1. Using a feeler gauge, measure the clearance between the drive and driven rotor tips.
  Standard tip clearance:
  
  0.040 to 0.160 mm (0.0016 to 0.0063 in.)
  
  Maximum tip clearance:
  
  0.160 mm (0.0063 in.)
  
  If the tip clearance is greater than maximum, replace the oil pump.
  
  Fig 3: Measuring Clearance Between Drive And Driven Rotor Tips
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Using a feeler gauge and precision straight edge, measure the clearance between the 2 rotors and precision straight edge.
  Standard side clearance:
  
  0.025 to 0.071 mm (0.0010 to 0.0028 in.)
  
  Maximum side clearance:
  
  0.071 mm (0.0028 in.)
  
  If the side clearance is greater than maximum, replace the oil pump.
  
  Fig 4: Measuring Clearance Between Rotors And Precision Straight Edge
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Using a feeler gauge, measure the clearance between the driven rotor and oil pump body.
  Standard body clearance:
  
  0.260 to 0.325 mm (0.0102 to 0.0128 in.)
  
  Maximum body clearance:
  
  0.325 mm (0.0128 in.)
  
  If the body clearance is greater than maximum, replace the oil pump.
  
  Fig 5: Measuring Clearance Between Driven Rotor And Oil Pump Body
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002