Bosch 0 986 010 850 Starter

Bosch 0 986 010 850 Starter

The Bosch 0 986 010 850 Starter is a high‑performance ignition motor designed for use in a wide range of Mercedes‑Benz and Puch vehicles. It delivers reliable starting power with a robust construction that ensures long service life even under demanding operating conditions.

Key Technical Specifications

• Voltage: 12 V DC
• Output Power: 1.5 kW (≈2.0 hp)
• Operating Current: Up to 90 A during start-up
• Rotation Direction: Clockwise, self‑aligned on the bearing
• Weight: Approximately 1.2 kg
• Dimensions: 140 mm (length) × 70 mm (diameter)
• Mounting Type: Standard bolt‑on with integrated mounting flange
• Temperature Range: –40 °C to +120 °C
• Operating Frequency: 50/60 Hz (AC supply for the starter motor)

Design Features and Construction

The starter incorporates a high‑strength steel housing that protects internal components from vibration, shock, and corrosion. Inside, a precision‑machined brushless DC motor drives the crankshaft via a gear train with a 1:3 reduction ratio, providing the necessary torque to turn the engine during start-up.

A key element of the design is the self‑aligned bearing system, which ensures that the starter rotates in the correct direction regardless of installation orientation. This feature simplifies assembly and reduces the risk of misalignment that could lead to premature wear or failure.

Compatibility Overview

The Bosch 0 986 010 850 Starter is engineered for a broad spectrum of Mercedes‑Benz models, including:

• W123 series (S‑class, SL, G‑model)
• W115 and W116 variants
• SL T1, S‑class Coupe, and Bus models
• T2/L vans and other Puch vehicles with similar electrical architecture

Its standardized mounting flange and electrical connections make it a drop‑in replacement for the original starter in these platforms. The starter’s output power is matched to the engine displacement range of 2.0 L–3.5 L, ensuring adequate torque for reliable ignition.

Installation Guidelines

1. Disconnect the battery: Remove the negative terminal to prevent accidental short circuits.
2. Remove the old starter: Unscrew the mounting bolts and detach the electrical connectors. Note the orientation of the gear train for correct reassembly.
3. Position the new starter: Align the mounting flange with the engine block, ensuring that the gear teeth mesh correctly with the crankshaft pulley.
4. Screw in place: Tighten bolts to the manufacturer’s torque specification (typically 25 Nm).
5. Reconnect electrical leads: Attach the high‑current connector and the low‑voltage control wire, ensuring secure contacts.
6. Reinstall battery: Reconnect the negative terminal and test the starter by engaging the ignition switch.

Performance Highlights

The 1.5 kW output provides a rapid crank speed, reducing engine start time even in cold weather or high‑altitude conditions. The robust motor design ensures that the starter can withstand repeated start cycles without significant wear.

Because the starter is brushless, it benefits from lower electrical losses and reduced heat generation compared to traditional brushed designs. This translates into higher efficiency and a longer operational lifespan.

Maintenance Tips

• Inspect the mounting bolts every 20,000 km for tightness.
• Check electrical connections for corrosion or looseness during routine service intervals.
• Avoid over‑voltage conditions; use a properly rated battery and charging system.

Why Choose the Bosch 0 986 010 850 Starter?

Choosing this starter guarantees:

• Reliability: Proven performance in demanding automotive environments.
• Compatibility: Designed to fit a wide range of classic and modern Mercedes‑Benz models.
• Durability: High‑quality materials and engineering reduce the likelihood of failure.
• Ease of Installation: Standardized mounting and electrical interfaces simplify replacement.

Whether restoring a vintage Mercedes or maintaining a contemporary model, the Bosch 0 986 010 850 Starter delivers dependable starting power that meets the expectations of automotive enthusiasts and professional mechanics alike.