Alternator: Testing and Inspection

2UZ-FE CHARGING: GENERATOR:

INSPECTION

1. INSPECT GENERATOR ROTOR ASSEMBLY

(a) Check the rotor for open circuit.
(1) Using an ohmmeter, check that there is continuity between the slip rings.
Standard resistance:
2.3 to 2.7 Ohms at 20°C (68°F)
If there is no continuity, replace the rotor.

(b) Check the rotor for ground.
(1) Using an ohmmeter, check that there is no continuity between the slip ring and rotor.
If there is continuity, replace the rotor.
(c) Check that the slip rings are not rough or scored.
If rough or scored, replace the rotor.

(d) Using vernier calipers, measure the slip ring diameter.
Standard diameter:
14.2 to 14.4 mm (0.559 to 0.567 in.)
Minimum diameter:
14.0 mm (0.551 in.)
If the diameter is less than minimum, replace the rotor.
2. INSPECT GENERATOR BRUSH HOLDER ASSEMBLY

(a) Using vernier caliper, measure the exposed brush length.
Standard exposed length:
10.5 mm (0.413 in.)
Minimum exposed length:
4.5 mm (0.177 in.)
If the exposed length is less than minimum, replace the brushes and brush holder assembly.
3. INSPECT GENERATOR DRIVE END FRAME BEARING
(a) Check the bearing is not rough or worn.
If necessary, replace the bearing.
4. INSPECT GENERATOR ROTOR BEARING
(a) Check the bearing is not rough or worn.
If necessary, replace the bearing.
5. REMOVE GENERATOR DRIVE END FRAME BEARING

(a) Remove the 4 screws, bearing retainer and bearing.

(b) Using SST and a hammer, tap out the bearing.
SST: 09950-60010
09951-00250
SST: 09950-70010
09951-07100
6. INSTALL GENERATOR DRIVE END FRAME BEARING

(a) Using SST and a press, press in a new bearing.
SST: 09950-60010
09951-00470
SST: 09950-70010
09951-07100
(b) Install the bearing retainer with the 4 screws.
Torque: 2.6 Nm (27 kgf-cm, 23 in-lbf)
7. REMOVE GENERATOR ROTOR BEARING

(a) Using SST, remove the bearing cover (outside) and bearing.
SST: 09820-00021
NOTE: Be careful not to damage the fan.

(b) Remove the bearing cover (inside).

(a) Using SST and a press, press in a new bearing.
SST: 09820-00031

(b) Using SST, push in the bearing cover (outside).
SST: 09285-76010