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Starter Motor 1477973: Features, Working Principle & Technical Specifications

Starter 1477973 Product Photo

Core Features

The 1477973 is a genuine Ford OEM planetary gear-reduction starter motor, manufactured by Bosch / Visteon, specially engineered for Ford Transit Connect & Tourneo Connect Mk1 light commercial diesel vehicles (2002–2013).

Compact Planetary Gear Reduction Structure

Built-in multi-stage planetary gear set delivers 1.4kW stable cranking torque, efficiently overcoming high compression resistance of 1.8L TDCi diesel engines under cold weather.

Top-Integrated Electromagnetic Solenoid

The solenoid unit is mounted on the upper motor housing, which simultaneously drives pinion axial movement and controls heavy-current main circuit switching. Equipped with standard M8 threaded B+ main power bolt terminal and dedicated 50-series plug control connector matching original Ford wiring harness.

10-Tooth Precision Drive Pinion

Hardened 10-tooth floating pinion paired with reinforced overrunning clutch, achieving low-noise, low-wear meshing with flywheel ring gear during frequent startup cycles.

3-Hole Standard Mounting Flange

76mm centering flange with three M10 threaded mounting holes, providing rigid fixed installation without any modification to the engine block.

Heavy-Duty Durable Construction

Anti-corrosion coated metal motor housing, high-temperature resistant carbon brushes, wear-resistant armature assembly and cast aluminum gear housing, designed to withstand heavy-duty frequent start-stop operation of delivery vans.

Full Interchangeable OE Variants

Interchangeable with matching part numbers including 1477974, 1345314, 2T1411000BA / BB / BC for universal replacement.

Working Principle

This starter converts 12V DC electrical energy from vehicle battery into mechanical cranking torque through four sequential operation phases:

Solenoid Activation

When the ignition switch is turned to START position, low-current control signal energizes the solenoid internal coil, generating magnetic force to pull the plunger forward.

Pinion Engagement

The plunger pushes the shift fork to slide the 10-tooth pinion outward axially, making complete meshing contact with the engine flywheel ring gear.

Engine Cranking Output

After full gear meshing, the solenoid closes heavy-duty internal contact points. High current flows into the DC armature motor; high-speed rotation torque is amplified by planetary reduction gears to drive the flywheel and crank the diesel engine until ignition.

Automatic Anti-Reverse Protection

Once the engine ignites and runs faster than the starter pinion speed, the built-in overrunning clutch slips to prevent reverse rotation damage to the starter. The solenoid loses power, return spring retracts the pinion back to idle position, and motor power supply cuts off automatically.

Complete Technical Parameter Table

Parameter Item	Standard Specification
OEM Part Number	1477973
Original Manufacturers	Bosch, Visteon
Nominal Operating Voltage	12V DC
Rated Output Power	1.4 kW
Starter Type	Planetary Gear Reduction Starter
Drive Pinion Tooth Count	10 teeth
Rotation Direction (Pinion Side View)	Clockwise (CW)
Centering Flange Diameter	76 mm
Mounting Holes	3 threaded M10 holes
Main Power Terminal	M8 threaded B+ bolt terminal
Control Connector	Standard 50 plug-in terminal
Overall Total Length	209 mm
Pinion Rest Stroke	15–16 mm
Approximate Net Weight	~3.4 kg
Compatible Engines	Ford 1.8 Di / TDDi / TDCi diesel (BHPA, P7PA)
Applicable Vehicle Models	Ford Transit Connect Mk1, Tourneo Connect Mk1 (2002–2013)
OEM Cross Reference Numbers	1477974, 1345314, 1756793, 2T1411000BA, 2T1411000BB, 0001109056
Aftermarket Equivalent Parts	RIDEX 2S0052, HC-Cargo 113910, AS-PL S9512P, ELSTOCK 25-3463, Bosch 0986022840

Supplementary Notes

This starter is factory-matched for Ford small commercial diesel vans, with unified mounting dimensions and electrical interfaces for direct bolt-on replacement.
The 1.4kW high-torque design ensures reliable cold cranking performance for high-compression 1.8L diesel engines even in low-temperature environments.
A large quantity of new and remanufactured aftermarket replacements are globally available, with complete cross-reference part numbers to simplify spare parts procurement for repair shops and cross-border auto spare traders.

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