Montana 0 Posted February 14, 2011 Report Share Posted February 14, 2011 What is the major differnece between the two? Is one with the solenoid and one separate? What are the ups and downs of both? Quote Link to post Share on other sites
matt_hooks 188 Posted February 15, 2011 Report Share Posted February 15, 2011 Self explanatory really. A "pre engaged" motor is one where the starter gear engages on the flywheel teeth before the motor starts to turn. This avoids the old problem with inertia starters, where the inertia of the starter cog caused the gear to be literally thrown into contact with the flywheel gear when the motor span up. This caused damage to both gear sets. You will only find pre-engaged types on any recent engine. The pre-engaged starter has an actuator (called the solenoid by most, strictly correct but not very descriptive) that moves the starter gear into contact with the flywheel by means of an electromagnet causing a plunger to draw in to the body. The plunger pushes on the "drive" gear and causes it to engage. The plunger also makes a contact that switches the motor on. When you turn the ignition key, you don't actually energise the starter motor, you energise the solenoid/actuator, which engages the drive gear and energises the starter motor. Hope that's useful? Quote Link to post Share on other sites
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