After lubricating the valve surface with fresh engine oil, install it into the seat hole and make sure that the valve drops under its own weight.
If this does not happen, replace the valve or the entire oil pump.
2. Check the driving and driven rotors.
Check the following clearances:
Radial clearance between the driven rotor and the housing:
nominal:
- 3S-FE, 4S-FE - 0.100 0.160 mm
- series A - 0.080-0.180 mm
- 2C — 0.100-0.170 mm
maximum allowable:
- 3S-FE, 4S-FE — 0.200 mm
- series A - 0.200 mm
- 2C - 0.200 mm
* Radial clearance between the protrusions of the leading and driven rotors:
nominal:
- 3S-FE, 4S-FE — 0,040 - 0,160
- series A - 0.025 - 0.085 mm
- 2C — 0.050 - 0.150 mm
maximum allowable:
- 3S-FE, 4S-FE — 0.200 mm
- series A - 0.0350 mm
- 2C - 0.200 mm
End clearance between rotors and housing wall:
nominal:
- 3S-FE, 4S-FE - 0.025 - 0.075 mm
- series A - 0.025 - 0.085 mm
- 2C — 0.030 - 0.090 mm
maximum allowable:
- 3S-FE, 4S-FE — 0.100 mm
- series A - 0.100 mm
- 2C - 0.150 mm
If either gap is greater than the maximum, replace both gears. If necessary, replace the entire pump.