Inspection [12/2023 - ]: Procedure

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. If the oil pump relief valve does not fall smoothly, replace the timing chain cover assembly.

Pre-procedure1

• Apply engine oil to the drive rotor and driven rotor.

• Install the drive rotor and driven rotor to the timing chain cover assembly with the rotor marks facing up. Check that the rotors rotate smoothly.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Rotor Mark

• If the rotors do not rotate smoothly, replace the timing chain cover assembly.

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

     Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

     *a	Feeler Gauge

     Standard Tip Clearance

     Maximum Tip Clearance	Specified Condition	Result
     0.150 mm 0.00591 in.	0.040 to 0.150 mm 0.00157 to 0.00591 in.	mm in.

  2. If the tip clearance is more than the maximum, replace the timing chain cover assembly.

• Check the side clearance.
  1. Using a feeler gauge and precision straightedge, measure the clearance between the drive rotor and driven rotor and precision straightedge as shown in the illustration.

     Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

     *a	Precision Straightedge
     *b	Feeler Gauge

     Standard Side Clearance

     Maximum Side Clearance	Specified Condition	Result
     0.070 mm 0.00276 in.	0.030 to 0.070 mm 0.00118 to 0.00276 in.	mm in.

  2. If the side clearance is more than the maximum, replace the timing chain cover assembly.

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

     Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

     *a	Feeler Gauge

     Standard Body Clearance

     Maximum Body Clearance	Specified Condition	Result
     0.325 mm 0.0128 in.	0.250 to 0.325 mm 0.00984 to 0.0128 in.	mm in.

  2. If the body clearance is more than the maximum, replace the timing chain cover assembly.

Post-procedure1

• None