Repair and Diagnosis: Electrical: Starter: Description

Bosch starter is a permanent magnet motor design. A planetary gear system between the armature and pinion shaft makes it possible to increase torque and reduce starter size. The planetary gear drive is splined to both the armature shaft and overrunning clutch. Starter torque is transmitted to the overrunning clutch pinion through the planetary gears which provide higher rotational speeds. Starter has serviceable solenoid and gear/clutch assembly.

Nippondenso starter is a 4-field, 4-brush, 12-volt motor with a solenoid mounted within the housing. The unit has a 2-to-1 reduction gear set in a die cast aluminum housing. Starter has serviceable gear and clutch assembly only. If starter solenoid fails, entire starter motor must be replaced.