Engine Oil Pump Components: Inspection

INSPECT RELIEF VALVE
Coat the valve with engine oil and check that it falls smoothly into the valve hole by 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
INSPECT DRIVE AND DRIVEN ROTORS INTO OIL PUMP BODY
Place the drive and driven rotors into the oil pump body with the mark facing upward.

Fig 2: Locating Mark On Drive & Driven Rotor
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT ROTORS FOR TIP CLEARANCE

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

Tip clearance:

INSPECT ROTORS FOR TIP CLEARANCE

Standard	0.110 - 0.240 mm (0.0043 - 0.0094 in.)
Maximum	0.35 mm (0.0138 in.)

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

Fig 3: Measuring Clearance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT ROTORS FOR SIDE CLEARANCE

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

Side clearance:

INSPECT ROTORS FOR SIDE CLEARANCE

Standard	0.030 - 0.090 mm (0.0012 - 0.0035 in.)
Maximum	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.

Fig 4: Measuring Side Clearance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT ROTOR FOR BODY CLEARANCE

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

Body clearance:

INSPECT ROTOR FOR BODY CLEARANCE

Standard	0.100 - 0.175 mm (0.0039 - 0.0069 in.)
Maximum	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.

Fig 5: Measuring Rotor Body Clearance