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 in smoothly by its own weight.
  If not, replace the relief valve. If necessary, replace the oil pump assembly.
  
  Fig 1: Inspecting Oil Pump Relief Valve
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT OIL PUMP ROTOR SET
1. Place the drive and driven rotors into the oil pump body with the marks facing the pump body cover side.
  
  Fig 2: Inspecting Oil Pump Rotor Set
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect the rotors for tip clearance.
  1. Using a feeler gauge, measure the tip 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: 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 straightedge, measure the side 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: 0.090 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: 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 body 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 assembly.
    
    Fig 5: Inspecting Rotor For Body Clearance
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002