Oil Pump Inspection

Coat the relief valve with engine oil and drop it into the relief valve hole.

Check that the relief valve falls in smoothly by its own weight.
If it does not, replace the relief valve. If necessary, replace the timing gear case assembly.

Install the driven rotor to the timing gear case with the mark facing the cylinder block side.

Check the tip clearance.

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

   Standard clearance:

   0.06 to 0.16 mm (0.00236 to 0.00630 in.)
   

   Maximum clearance:

   0.21 mm (0.00827 in.)
   

   If the tip clearance is more than the maximum, replace the timing gear case assembly.
   

Check the body clearance.

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

   Standard clearance:

   0.10 to 0.17 mm (0.00394 to 0.00669 in.)
   

   Maximum clearance:

   0.2 mm (0.00787 in.)
   

   If the body clearance is more than the maximum, replace the timing gear case assembly.
   

Check the side clearance.

1. Using a feeler gauge and precision straightedge, measure the clearance between the rotor and precision straightedge.
   

   Standard clearance:

   0.03 to 0.09 mm (0.00118 to 0.00354 in.)
   

   Maximum clearance:

   0.15 mm (0.00591 in.)
   

   If the side clearance is more than the maximum, replace the timing gear case assembly.