Oil Pump: Inspection

INSPECT OIL PUMP RELIEF VALVE
1. Coat the relief valve with engine oil and drop it into the relief valve hole.
2. Check that the relief valve falls smoothly by its own weight.
  If not, replace the relief valve. If necessary, replace the oil pump.
  
  Fig 1: Coating Valve With Engine Oil
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT OIL PUMP GEAR SET
1. Install the rotors to the oil pump body and align the rotor's matchmarks.
  
  Fig 2: Inspecting Oil Pump Gear Set
  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 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 it with a new drive and driven rotor set.
    
    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 rotor and precision straightedge.
    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 it with a new drive and driven rotor set.
    
    Fig 4: Measuring Clearance Between Rotors And Precision Straight Edge
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Check the body clearance.
  1. Using a feeler gauge, measure the clearance between the oil pump body and driven rotor.
    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 oil pump.
    
    Fig 5: Measuring Body Clearance Between Oil Pump Body & Driven Rotor
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002