Oil Pump: Inspection

INSPECT OIL PUMP RELIEF VALVE
1. Coat the relief valve with engine oil and check that it falls smoothly into the valve hole under its own weight.
  If it does 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

Install the rotors to the timing chain cover with the rotors' marks facing outward. Check that the rotors revolve smoothly.

Fig 2: Inspecting Oil Pump Rotor Set
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the tip clearance.

Using a feeler gauge, measure the clearance between the drive and driven rotor tips, as shown in the illustration.

Tip clearance

TIP CLEARANCE SPECIFICATION

Standard	Maximum
0.060 to 0.160 mm (0.0024 to 0.0063 in.)	0.16 mm (0.0063 in.)

If the tip clearance is greater than the maximum, replace the drive and driven rotors.

Fig 3: Measuring Clearance Between Drive Rotor And Driven Rotor Tips

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check the side clearance.

Using a feeler gauge and precision straight edge, measure the clearance between the rotors and precision straight edge, as shown in the illustration.

Side clearance

SIDE CLEARANCE SPECIFICATION

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

Fig 4: Checking Side Clearance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If the side clearance is greater than the maximum, replace the timing chain cover.

Check the body clearance.

Using a feeler gauge, measure the clearance between the timing chain cover and driven rotor, as shown in the illustration.

Body clearance

BODY CLEARANCE SPECIFICATION

Standard	Maximum
0.250 to 0.325 mm (0.0098 to 0.0128 in.)	0.325 mm (0.0128 in.)

Fig 5: Checking Body Clearance

If the body clearance is greater than the maximum, replace the timing chain cover.