Oil Pump: Inspection

INSPECT OIL PUMP RELIEF VALVE
1. Coat the relief valve with engine oil. Check that it falls smoothly into the valve hole by its own weight. If it does not, replace the relief valve. If necessary, replace the oil pump assembly.
  
  Fig 1: Inspecting Relief Valve Smoothly Into Valve Hole
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT OIL PUMP ROTOR SET
1. Install the rotors to the timing chain cover with the rotors' marks facing outward. Check that the rotors revolves smoothly.
  
  Fig 2: Identifying Oil Pump Rotor Installation Position
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the tip clearance.
  1. Using a feeler gauge, measure the clearance between the drive and driven rotor tips, as shown in the illustration.
    Standard tip clearance:
    
    0.060 to 0.160 mm (0.0024 to 0.0063 in.)
    
    Maximum tip clearance:
    
    0.16 mm (0.0063 in.)
    
    If the tip clearance is greater than the maximum, replace the drive and driven rotors.
    
    Fig 3: Measuring Clearance Between Drive And Driven Rotor Tips
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check the side clearance.
  1. Using a feeler gauge and precision straightedge, measure the clearance between the rotors and precision straightedge, as shown in the illustration.
    Standard side clearance:
    
    0.030 to 0.090 mm (0.0012 to 0.0035 in.)
    
    Maximum side clearance:
    
    0.090 mm (0.0035 in.)
    
    If the side clearance is greater than the maximum, replace the timing chain cover.
    
    Fig 4: Checking Side Clearance
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Check the body clearance.
  1. Using a feeler gauge, measure the clearance between the timing chain cover and driven rotor, as shown in the illustration.
    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 timing chain cover.
    
    Fig 5: Measuring Clearance Between Timing Chain Cover Driven Rotor
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002