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Bosch Starter Motor - 1986S00778

Bosch Starter Motor - 1986S00778

Ensure reliable engine starting with the high-quality Bosch Starter Motor, designed to meet strict...

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Starter motor Anticlockwise rotation Non self-supporting 1 986 S00 778 BOSCH

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eBayStarter motor Anticlockwise rotation Non self-supporting 1 986 S00 778 BOSCH
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My Motor WorldBosch 1986S00778 Starter Motor (St12v17kwl)
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Product Information

Full details

The Bosch Starter Motor (1986S00778) is a premium, OE-quality replacement component designed specifically for Porsche 911 (964/993) enthusiasts and technicians seeking reliable ignition performance. Delivering a consistent 1.7kW of power at 12V, this unit ensures your engine cranks reliably under various conditions, though installers must be careful to verify specific housing measurements before purchase to ensure exact fitment for their particular engine configuration.

All features

Model Part Number1986S00778
BrandBosch

Extended Product Information

FAQs

Is this a self-supporting starter?

No, this is a non-self-supporting unit, meaning it relies on the housing alignment for proper operation.

Will this fit a Porsche 993?

Yes, this part is compatible with various Porsche 911 models including the 993 series, but you should verify your specific VIN and part number.

What is the voltage rating for this starter?

The Bosch 1986S00778 is designed for a standard 12V automotive electrical system.

What is the flange diameter?

This unit features a 76.2 mm flange diameter.

Does this package include mounting bolts?

No, mounting hardware is generally reused from the previous installation or must be sourced separately if damaged.

What should I do if the starter doesn't engage the flywheel?

Confirm the flange diameter and length match your original part perfectly and ensure no debris is blocking the mounting surface.

Troubleshooting

Starter solenoid clicks but engine does not turn

Check battery charge levels and ensure the ground connection between the engine and chassis is clean and secure.

Grinding noise during startup

Verify that the starter is correctly seated against the flange and that the 10-tooth pinion is not obstructed or misaligned.

Slow cranking speed

Inspect the positive battery cable for signs of internal corrosion or fraying which may be causing excessive resistance.

Pros and Cons

Pros

  • Meets strict OE manufacturing standards
  • High reliability for cold or warm starts
  • Engineered specifically for Porsche 911 (964/993) architecture
  • Durable construction for long-term use

Cons

  • Requires professional verification of fitment before purchase
  • Non-self-supporting design requires correct alignment
  • Installation requires access to the underside of the engine

Setup, Compatibility & Care

Compatibility is critical; this unit is designed for specific Porsche 911 variants (964 and 993). Before installation, cross-reference part number 1986S00778 with your existing starter's identification plate.

  1. Disconnect the vehicle battery before starting work.
  2. Remove the old starter by disconnecting the solenoid wire and the main battery cable.
  3. Ensure the mating surface on the transmission housing is free of debris or rust.
  4. Secure the new starter to the flange, ensuring the 10-tooth gear aligns correctly with the flywheel ring gear.
  5. Inspect all electrical connections for corrosion; apply a light dielectric grease to prevent future oxidation. Periodic care involves ensuring the engine bay remains dry and the starter solenoid connections stay tight to prevent voltage drop.

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