Core Features

The 4M5T11000FD is a gear-reduction type starter motor originally designed for Ford vehicles (e.g., Ford Focus, C-Max, and related models). It is engineered to deliver reliable cranking torque for gasoline engines, with the following key characteristics:

Structural Design

Compact, robust build with a metallic motor housing and integrated electromagnetic solenoid (solenoid switch) on top.

Front-mounted drive pinion gear (typically 11 teeth) for meshing with the engine flywheel ring gear.

Three mounting holes on the flange (diameter approx. 62.5–63 mm) for secure installation to the engine block.

Functional Advantages

Adopts a planetary gear reduction mechanism to amplify torque while keeping the motor size compact.

Integrated solenoid design that simultaneously pushes the pinion gear to engage the flywheel and closes the high-current motor circuit.

Optimized for 12V automotive electrical systems, ensuring consistent performance under cold-start conditions.

Working Principle

The starter motor operates in three key stages:

Engagement Phase

When the driver turns the ignition key or presses the start button, a low-current control signal energizes the solenoid's electromagnet. This magnetic force pushes a plunger forward, which extends the drive pinion gear to mesh with the engine's flywheel ring gear.

Power Delivery Phase

As the pinion fully engages, the plunger closes heavy-duty electrical contacts inside the solenoid, allowing high current (hundreds of amperes) from the vehicle battery to flow into the DC motor. The motor's armature rotates rapidly, and torque is multiplied via the planetary gear reduction set, driving the flywheel to crank the engine until it starts.

Disengagement Phase

Once the engine fires and its speed exceeds the starter motor's speed, the overrunning clutch in the pinion assembly slips to prevent the engine from back-driving the starter. The solenoid then de-energizes, and a return spring retracts the pinion gear to its resting position, cutting power to the motor.

Key Technical Parameters

Parameter	Specification
OEM Part Number	4M5T11000FD
Rated Voltage	12V DC
Rated Power	2.2 kW
Drive Pinion Teeth	11 teeth (some variants: 10 teeth)
Rotation Direction	Clockwise (CW)
Flange Diameter	62.5–63 mm
Number of Mounting Holes	3
Number of Threaded Holes	3
Compatible Vehicle Makes	Ford (and related models like Volvo C30/S40, Mazda variants)
Compatible Engine Types	Primarily gasoline engines (e.g., 1.8L/2.0L in Ford Focus/C-Max)
Aftermarket Equivalents	HELLA, VALEO, AD KÜHNER, AS-PL, and other aftermarket suppliers offer direct replacements

Detection3

Supplementary Notes

This starter is a Ford original equipment (OE) part, with aftermarket versions produced by suppliers like HELLA and VALEO.

The 2.2 kW power rating ensures sufficient torque to crank Ford's mid-sized gasoline engines, even in low-temperature conditions.

The gear-reduction design makes it lighter and more efficient than older direct-drive starters, while maintaining high durability for repeated start cycles.