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Starters Audi 90 B4

Starter 1 illustration ~244 words

DESCRIPTION

Starter is a brush-type, series-wound electric motor with an overrunning clutch and reduction gear. (Scheme 1) Field frame is enclosed by commutator end frame and drive bushing. Field frame carries pole shoes and field coils. A splined armature shaft drive end carries drive assembly.

STARTER DOES NOT CRANK ENGINE

  1. Ensure battery is fully charged, engine-to-body ground strap is connected and all cable connections are clean and tight. With ignition switch in crank position, measure voltage at starter solenoid wire terminal. If reading is 8 volts or more, go to step 3). If reading is less than 8 volts, go to next step.
  2. Measure voltage at Black/Yellow wire terminal of ignition switch. If reading is at least 8 volts, repair circuit between ignition switch and starter solenoid. If reading is less than 8 volts, replace ignition switch.
  3. With ignition switch in crank position, measure voltage at bottom (armature) terminal of starter solenoid. If reading is at least 8 volts, repair or replace starter. If reading is less than 8 volts, replace starter solenoid.

Note. On A/T vehicles, also check park/neutral switch.

STARTER CRANKS TOO SLOWLY

Ensure battery is fully charged. Ensure all cable connections are clean and tight. Ensure ground strap, located between transmission and body, is clean and tight. Ensure engine crankcase is filled with oil of recommended viscosity. If starter still turns slowly, repair or replace starter.

OVERHAUL

Note. For overhaul, refer to exploded view of starter. (Scheme 1)

Scheme 1

Scheme 1: OVERHAUL