Oil Pump: Inspection

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

1. Standard clearance:0.10-0.18 mm (0.0039-0.0069 in.) 
2. Maximum clearance: 0.30 mm (0.0118 in.) 

If the clearance is greater than the maximum, replace the oil pump rotor set and/or pump body.

Fig 1: Inspecting Body Clearance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

1. Standard clearance:0.11 - 0.24 mm (0.0043 - 0.0094 in.) 
2. Maximum clearance: 0.35 mm (0.0138 in.) 

If the clearance is greater than the maximum, replace the oil pump rotor set.

Fig 2: Inspecting Tip Clearance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Using a thickness gauge and precision straight edge, measure the side clearance, as shown.

1. Standard clearance:0.03 - 0.09 mm (0.0012 - 0.0035 in.) 
2. Maximum clearance: 0.15 mm (0.0059 in.) 

If the clearance is greater than the maximum, replace the oil pump rotor set and/or pump body.

Fig 3: Inspecting Side Clearance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

If the valve does not fall smoothly, replace the valve and/or oil pump assembly.

Fig 4: Inspecting Relief Valve

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002