Bosch 0986017440 Starter

Bosch 0986017440 Starter Motor

The Bosch 0986017440 Starter Motor is a high‑performance ignition component designed for a wide range of Land Rover vehicles, including the Range Rover, Defender, and Discovery series. Manufactured by Bosch, a global leader in automotive technology, this starter delivers reliable power and durability across diverse operating conditions.

Key Technical Specifications

• Model Number: 0986017440 (also listed as 0 986 017 440)
• Voltage: 12 V DC
• Power Output: 1.7 kW
• Gear Ratio: 9 teeth on the pinion, 2 holes for mounting
• Thread Size: 0 thread (standard automotive thread)
• Rotation: Clockwise, self‑supporting
• Length: 263 mm (fits most Land Rover models)

Vehicle Compatibility

The starter motor is engineered to fit a broad spectrum of Land Rover models, ensuring seamless integration and optimal performance. Below are the primary vehicle families and model years that this starter supports:

• Range Rover Mk1 – 3.5 L (1970–1981), 4.3 L (1992–1994)
• Range Rover Mk2 P38A – 3.9 L (1989–1994), 4.0 L (1995–2002)
• Range Rover Vogue – 3.5 L (1988–1990), 3.9 L (1989–1994), 4.3 L (1992–1994)
• Defender L316 – 3.5 L (1990–1994), 4.0 L (1998–2002)
• Discovery Mk1 & Mk2 – 3.9 L (1993–1998), 4.0 L (1999–2002)
• Land Rover 110/127 – 3.5 L (1987–1990), 4.0 L (1993–2002)

Design and Construction

The Bosch 0986017440 Starter Motor features a robust iron housing that protects internal components from vibration and thermal stress. Its 9‑tooth pinion gear engages the flywheel with precision, delivering consistent torque to crank the engine. The two‑hole mounting system aligns with standard Land Rover chassis brackets, simplifying installation.

Internally, the motor employs a brushless DC design, reducing wear and extending service life. The stator winding is insulated with high‑temperature varnish, ensuring reliability even under prolonged operation. A sealed bearing assembly maintains low friction, contributing to efficient power transfer.

Performance Characteristics

• High Torque Output: The 1.7 kW rating provides ample torque for heavy‑duty Land Rover engines, enabling quick start-up even in cold or high‑altitude environments.
• Low Current Draw: Designed to draw minimal current from the battery, preserving charge and reducing load on the charging system.
• Rapid Response: The brushless architecture allows the starter to engage within milliseconds, ensuring smooth engine cranking.
• Durability: Tested to withstand thousands of start cycles, the motor maintains performance over extended service intervals.

Installation Guide

Installing the Bosch 0986017440 Starter Motor involves the following steps:

1. Disconnect the battery. Ensure all electrical connections are isolated to prevent accidental shorts.
2. Remove the old starter. Unbolt the mounting screws and detach the wiring harness.
3. Position the new starter. Align the two mounting holes with the chassis brackets and secure with bolts.
4. Connect the wiring harness. Attach the high‑current connector, ensuring a tight seal.
5. Reconnect the battery. Verify all connections are secure before testing.
6. Test the starter. Engage the ignition to confirm smooth cranking and proper operation.

Maintenance Tips

• Inspect the wiring harness for corrosion or damage before each installation.
• Check the battery condition to ensure it can supply sufficient current for cranking.
• Verify the mounting bolts are tightened to the manufacturer’s torque specification.
• Monitor for unusual noise during operation, which may indicate bearing wear or misalignment.

Why Choose Bosch?

Bosch is renowned for its commitment to quality, innovation, and reliability. The 0986017440 Starter Motor reflects this heritage through:

• Precision engineering that meets strict automotive standards.
• Advanced materials that resist heat, vibration, and corrosion.
• Extensive testing across diverse climates and operating conditions.
• Global support network that provides technical assistance and documentation.

Conclusion

The Bosch 0986017440 Starter Motor is a dependable, high‑performance component tailored for Land Rover’s iconic vehicles. Its robust construction, precise gear engagement, and efficient power delivery make it an ideal choice for both original equipment replacement and aftermarket upgrades. Whether you’re restoring a classic Range Rover or maintaining a modern Defender, this starter ensures reliable engine start-up and long‑term durability.