Oil Pump: Inspection

Coat the valve with engine oil and check that it falls smoothly into the valve hole under its own weight.

If it doesn't, replace the relief valve. If necessary, replace the oil pump assembly.

Fig 1: Inspecting Relief Valve

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Place the rotors into the oil pump body (See REASSEMBLY ).
2. Inspect the rotors for the tip clearance.

   Using a feeler gauge, measure the clearance between the drive and driven rotors.

   • Standard tip clearance: 0.060-0.240 mm (0.0024-0.0094 in.) 
   • Maximum tip clearance: 0.30 mm (0.0118 in.) 

   If the tip clearance is greater than maximum, replace the rotors as a set.

   Fig 2: Inspecting Rotors For Tip Clearance

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Inspect the rotor for the body clearance.

   Using a feeler gauge, measure the clearance between the driven rotor and pump body.

   • Standard body clearance: 0.100-0.175 mm (0.0039-0.0069 in.) 
   • Maximum body clearance: 0.20 mm (0.0079 in.) 

   If the body clearance is greater than maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.

   Fig 3: Inspecting Rotor For Body Clearance

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Inspect the rotors for the side clearance.

   Using a feeler gauge and precision straight edge, measure the clearance between the rotors and precision straight edge.

   • Standard side clearance: 0.030-0.090 mm (0.0012-0.0035 in.) 
   • Maximum side clearance: 0.12 mm (0.0047 in.) 

   If the side clearance is greater than maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.

   Fig 4: Inspecting Rotors For Side Clearance

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Remove the rotors.