Oil Pump: Inspection

Inspect oil jet.
1. Check the oil jet for damage or clogging. If necessary, replace the oil pump assembly.
  
  Fig 1: Checking Oil Jet For Clogging
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Inspect relief valve.
1. Coat the valve with engine oil and check that it falls smoothly into the valve hole by its own weight.
  
  Fig 2: Checking Relief Valve Falls Smoothly Into Valve Hole
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. If it does not, replace the relief valve. If necessary, replace the oil pump assembly.
Inspect rotor side clearance.
1. Inspect the rotors for the side clearance.
  1. Using a feeler gauge and precision straight edge, measure the clearance between the rotors and precision straight edge.
    1. Standard side clearance: 0.025 - 0.075 mm (0.0010 - 0.0030 in.)
    2. Maximum side clearance: 0.15 mm (0.0059 in.)
    If the side clearance is greater than maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.
2. Inspect the rotors for the tip clearance.
  1. Using a feeler gauge, measure the clearance between the drive and driven rotor tips.
    1. Standard tip clearance: 0.060 - 0.180 mm (0.0024 - 0.0071 in.)
    2. Maximum tip clearance: 0.35 mm (0.0138 in.)
    If the tip clearance is greater than maximum, replace the rotors as a set.
3. Inspect the rotor for the body clearance.
  1. Using a feeler gauge, measure the clearance between the driven rotor and body.
    
    Fig 5: Measuring Clearance Between Driven Rotor & Body
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Standard body clearance: 0.100 - 0.180 mm (0.0039 - 0.0071 in.)
    2. Maximum body clearance: 0.30 mm (0.0118 in.)
    If the body clearance is greater than maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.