Oil Pump: Inspection

INSPECT OIL PUMP RELIEF VALVE
1. Coat the valve with engine oil and check that it falls smoothly into the valve hole under its own weight. If it does 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 pump body with the marks facing the pump body cover side.
  
  Fig 2: Inspecting Drive And Driven Rotors Marks Facing Pump Body Cover Side
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect the rotors for tip clearance.
  1. Using a feeler gauge, measure the clearance between the drive and driven rotor tips.
    Standard tip clearance:
    
    0.060 to 0.180 mm (0.0024 to 0.0071 in.)
    
    Maximum tip clearance:
    
    0.18 mm (0.0071 in.)
    
    If the tip clearance is greater than the maximum, replace the rotors as a set.
    
    Fig 3: Inspecting Rotors For Tip Clearance
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Inspect the rotors for side clearance.
  1. Using a feeler gauge and precision straight edge, measure the clearance between the rotors and precision straight edge.
    Standard side clearance:
    
    0.030 to 0.090 mm (0.0012 to 0.0035 in.)
    
    Maximum side clearance:
    
    0.09 mm (0.0035 in.)
    
    If the side clearance is greater than the maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.
    
    Fig 4: Inspecting Rotors For Side Clearance
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Inspect the rotor for body clearance.
  1. Using a feeler gauge, measure the clearance between the driven rotor and body.
    Standard body clearance:
    
    0.250 to 0.325 mm (0.0098 to 0.0128 in.)
    
    Maximum body clearance:
    
    0.325 mm (0.0128 in.)
    
    If the body clearance is greater than the maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.
    
    Fig 5: Inspecting Rotor For Body Clearance
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002