Oil Pump Inspection

Check the oil jet for damage or clogging.
If necessary, repair the cylinder block.

Check the relief valve.

1. Coat the valve with engine oil, and then check that the valve falls smoothly into the valve hole under its own weight.
   If the valve does not fall smoothly, replace the relief valve. If necessary, replace the oil pump assembly.
   

Install the oil pump rotor.

1. Coat the drive rotor and driven rotor with engine oil.
   

2. Place the drive and driven rotors into the oil pump with the marks facing the pump cover side.
   

Check the side clearance.

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

   Standard clearance:

   0.030 to 0.085 mm (0.0012 to 0.0033 in.)
   

   Maximum clearance:

   0.16 mm (0.0063 in.)
   

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

Check the tip clearance.

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

   Standard clearance:

   0.080 to 0.160 mm (0.0031 to 0.0063 in.)
   

   Maximum clearance:

   0.35 mm (0.0138 in.)
   

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

Check the body clearance.

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

   Standard clearance:

   0.100 to 0.170 mm (0.0039 to 0.0067 in.)
   

   Maximum clearance:

   0.325 mm (0.0128 in.)
   

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

Pull the chain with a force of 140 N (14.3 kgf, 31.5 lbf) as shown in the illustration.

Using vernier calipers, measure the length of 15 links.

Maximum chain elongation:

102.2 mm (4.024 in.)

NOTICE:

Perform the measurement at 3 random places. Use the average of the measurements.

Wrap the chain around the sprocket.

Using vernier calipers, measure the sprocket diameter with the chain wrapped around.

Minimum gear diameter (with chain):

48.2 mm (1.898 in.)

NOTICE:

The vernier calipers must be in contact with the chain rollers when measuring.

Wrap the chain around the sprocket.

Using vernier calipers, measure the sprocket diameter with the chain wrapped around.

Minimum gear diameter (with chain):

48.2 mm (1.898 in.)

NOTICE:

The vernier calipers must be in contact with the chain rollers when measuring.

Using vernier calipers, measure the vibration damper wear.

Maximum wear:

0.5 mm (0.020 in.)