Oil Pump: Inspection

INSPECT OIL PUMP RELIEF VALVE
1. Check the relief valve.
  1. Coat the valve with engine oil, and then check that the valve 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: Locating Oil Pump Relief Valve
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT OIL PUMP ROTOR
1. Check the side clearance.
  1. Using a feeler gauge and precision straightedge, measure the clearance between the rotors and precision straightedge.
    Standard clearance: 0.100 to 0.170 mm (0.0039 to 0.0067 in.)
    
    Maximum clearance: 0.325 mm (0.0128 in.)
    
    If the side clearance is greater than the maximum, replace the oil pump assembly.
    
    Fig 2: Identifying Clearance Between Rotors And Precision Straightedge
    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.
    Standard clearance: 0.080 to 0.160 mm (0.0031 to 0.0063 in.)
    
    Maximum clearance: 0.35 mm (0.0138 in.)
    
    If the tip clearance is greater than the maximum, replace the oil pump assembly.
    
    Fig 3: Identifying Clearance Between Drive And Driven Rotor Tips
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check the body clearance.
  1. Using a feeler gauge, measure the clearance between the driven rotor and pump body.
    Standard clearance: 0.100 to 0.170 mm (0.0039 to 0.0067 in.)
    
    Maximum clearance: 0.325 mm (0.01128 in.)
    
    If the body clearance is greater than the maximum, replace the oil pump assembly.
    
    Fig 4: Identifying Clearance Between Driven Rotor And Pump Body
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002