Oil Pump: Inspection

1. Coat the oil pump relief valve with engine oil, then check that it falls smoothly into the valve hole by its own weight.

If this does not occur, replace the oil pump.

Fig 1: Checking Oil Pump Relief Valve

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard tip clearance: 

   0.08 to 0.16 mm (0.00315 to 0.00630 in.) 

   Maximum tip clearance: 

   0.35 mm (0.0138 in.) 

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

   Fig 2: Measuring Clearance Between Drive And Driven Rotor Tips

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Using a feeler gauge and precision straightedge, measure the clearance between the 2 rotors and precision straight edge.

   Standard side clearance: 

   0.03 to 0.08 mm (0.00118 to 0.00315 in.) 

   Maximum side clearance: 

   0.16 mm (0.00630 in.) 

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

   Fig 3: Measuring Clearance Between Rotors And Precision Straightedge

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Using a feeler gauge, measure the clearance between the driven rotor and oil pump body.

   Standard body clearance: 

   0.12 to 0.19 mm (0.00472 to 0.00748 in.) 

   Maximum body clearance: 

   0.325 mm (0.0128 in.) 

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