Oil Pump: Inspection

INSPECT OIL PUMP RELIEF VALVE
1. Coat the valve with engine oil, then check that it falls smoothly into the valve hole by its own weight. If not, replace the relief valve.
  If necessary, replace the oil pump assembly.
  
  Fig 1: Identifying Oil Pump Relief Valve
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT OIL PUMP ROTOR SET
1. Place the drive and driven rotors into the timing chain cover with the marks facing upward.
  
  Fig 2: Identifying Marks On Oil Pump Rotor
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the rotor tip clearance.
  1. Using a feeler gauge, measure the clearance between the drive and driven rotor tips.
    Standard clearance:
    
    0.06 to 0.16 mm (0.0024 to 0.0063 in.)
    
    Maximum tip clearance:
    
    0.16 mm (0.0063 in.)
    
    If the clearance is greater than the maximum, replace the drive and driven rotors together.
    
    Fig 3: Measuring Rotor Tip Clearance Between Drive & Driven Rotor Tips Using Feeler Gauge
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check the rotor side clearance.
  1. Using a feeler gauge and precision straight edge, measure the clearance between the rotors and precision straight edge.
    Standard clearance:
    
    0.03 to 0.09 mm (0.0012 to 0.0035 in.)
    
    Maximum side clearance:
    
    0.09 mm (0.0035 in.)
    
    If the clearance is greater than the maximum, replace the drive and driven rotors. If necessary, replace the timing chain cover assembly.
    
    Fig 4: Measuring Rotor Side Clearance Between Rotors & Precision Straight Edge Using Feeler Gauge
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Check the rotor body clearance.
  1. Using a feeler gauge, measure the clearance between the driven rotor and body.
    Standard clearance:
    
    0.250 to 0.325 mm (0.0098 to 0.0128 in.)
    
    Maximum body clearance:
    
    0.325 mm (0.0128 in.)
    
    If the clearance is greater than the maximum, replace the drive and driven rotors. If necessary, replace the timing chain cover assembly.
    
    Fig 5: Measuring Rotor Body Clearance Between Driven Rotor & Body Using Feeler Gauge
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002