The starter motor is mounted on the rear surface of the top of the engine and can be a Bosch or DeLco-Remy type. Both options are of the pre-engaged type, i.e. the drive gear is engaged in engagement with the starter transfer ring on the flywheel before the main current is applied.
When the ignition is turned on, current flows from the battery to the solenoid, which is located on the starter housing. The solenoid plunger moves inward, causing the center support arm to move, which engages the drive gear with the starter ring. When the solenoid plunger reaches the end of its stroke, it closes the internal contact and all current flows to the starter field coils. Now the armature is able to rotate the shaft, which starts the engine.
The starter drive gear is equipped with a special one-way clutch so that once the engine starts and starts running on its own, it does not cause the starter motor to run.
When the ignition is turned off, the solenoid does not receive power and the spring pushes the plunger back to its original position. This causes the support arm to pull the drive gear out of engagement with the starter ring.
Both types of starter motors have a similar design, so the removal, installation, disassembly, inspection and assembly processes described below can be applied to both types of starter motors. Significant differences will be highlighted.
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