Lexus SC300 / Lexus SC400. Manual — part 694

(b) Remove the three nuts and end cover.

2.

REMOVE BRUSH HOLDER AND IC REGULATOR
(a) Remove the brush holder cover from the brush holder.

(b) Remove the five screws, brush holder and IC regulator.

3.

REMOVE RECTIFIER HOLDER
(a) Remove the four screws and rectifier holder.

(b) Remove the four rubber insulators.

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CHARGING SYSTEM

Alternator

CH–11

(c) Remove the seal plate.

4. REMOVE

PULLEY

(a) Hold SST (A) with a torque wrench, and tighten SST (B)

clockwise to the specified torque.

SST 09820–63010

Torque: 39 N

⋅

m (400 kgf

⋅

cm, 29 ft

⋅

lbf)

(b) Check that SST (A) is secured to the rotor shaft.

(c) As

shown in the illustration, mount SST (C) in a vise, and

install the alternator to SST (C).

(d) To loosen the pulley nut, turn SST (A) in the direction

shown in the illustration.

NOTICE: To prevent damage to the rotor shaft, do not
loosen the pulley nut more than one–half of a turn.
(e) Remove the alternator from SST (C).
(f) Turn SST (B) and remove SST (A and B).
(g) Remove the pulley nut and pulley.

5.

REMOVE RECTIFIER END FRAME
(a) Remove the four mounting nuts.

(b) Using SST, remove the rectifier end frame.
SST 09286–46011

CH–12

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CHARGING SYSTEM

Alternator

(c) Remove the alternator washer.

6.

REMOVE ROTOR FROM DRIVE END FRAME

INSPECTION AND REPAIR OF
ALTERNATOR
Rotor

1.

INSPECT ROTOR FOR OPEN CIRCUIT
Using an ohmmeter, check that there is continuity between
the slip rings.

Standard resistance (Cold): 2.8–3.0

If there is no continuity, replace the rotor.

2.

INSPECT ROTOR FOR GROUND
Using an ohmmeter, check that there is no continuity be-
tween the slip ring and rotor.
If there is continuity, replace the rotor.

3.

INSPECT SLIP RINGS
(a) Check that the slip rings are not rough or scored.
If rough or scored, replace the rotor.
(b) Using a vernier caliper, measure the slip ring diameter.

Standard diameter: 14.2–14.4 mm

(0.559–0.567 in.)

Minimum diameter: 12.8 mm (0.504 in.)

If the diameter is less than minimum, replace the rotor.

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CHARGING SYSTEM

Alternator

CH–13

Stator (Drive End Frame)

1.

INSPECT STATOR FOR OPEN CIRCUIT
Using an ohmmeter, check that there is continuity between
the coil leads.
If there is no continuity, replace the drive end frame assem-
bly.

2.

INSPECT STATOR FOR GROUND
Using an ohmmeter, check that there is no continuity be-
tween the coil lead and drive end frame.
If there is continuity, replace the drive end frame assembly.

Brushes

INSPECT EXPOSED BRUSH LENGTH

Using a vernier caliper, measure the exposed brush length.

Standard exposed length: 10.5 mm (0.413 in.)

Minimum exposed length: 1.5 mm (0.059 in.)

If the exposed length is less than minimum, replace the brush
holder.

Rectifiers (Rectifier Holder)

1.

INSPECT POSITIVE RECTIFIER
(a) Using an ohmmeter, connect one tester probe to the

positive (+) terminal and the other to each rectifier
terminal.

(b) Reverse the polarity of the tester and repeat (a).
(c) Check

that one shows continuity and the other shows no

continuity.

If continuity is not as specified, replace the rectifier holder.

2. INSPECT

NEGATIVE

RECTIFIER

(a) Using an ohmmeter, connect one tester probe to each

negative (–) terminal and the other to each rectifier
terminal.

(b) Reverse the polarity of the tester probes and repeat (a).
(c) Check

that one shows continuity and the other shows no

continuity.

If continuity is not as specified, replace the rectifier holder.

CH–14

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CHARGING SYSTEM

Alternator