Bosch Starter Motor 12V 9 Tooth CW 1986S00978

This Bosch starter motor is a 12V unit with clockwise rotation and 9 teeth, listed under part number 1986S00978. It is supplied as an original equipment part and comes as one each, which is important when matching a replacement to the vehicle’s electrical and mounting requirements.

The unit has 3 mounting bores and is identified as a starter motor in the rotating electrical group. Those details matter when comparing the replacement to the original unit, particularly where the starter housing, bolt pattern, and pinion tooth count need to line up exactly for correct installation.

Fitment references supplied for this part include Audi Q7, Porsche Cayenne, Porsche Panamera, and Volkswagen Touareg applications. Those vehicle names can help narrow the search, but the safest way to confirm suitability is still to match the part number, voltage, rotation, tooth count, and mounting details before ordering.

Key Features

• Original equipment part
• 12V starter motor
• Clockwise rotation
• 9 tooth pinion
• 3 mounting bores
• Supplied each

Specifications

• Part No.: 1986S00978
• Brand: Bosch
• Product type: Starter motor
• Voltage: 12V
• Rotation: CW
• Number of teeth: 9
• Number of mounting bores: 3
• Unit of measure: Each

Known fitment references

• Audi Q7
• Porsche Cayenne
• Porsche Panamera
• Volkswagen Touareg

Application and Buying Notes

Before ordering, compare the existing starter against this Bosch unit using the key identifiers: 12V voltage, clockwise rotation, 9 tooth pinion, and 3 mounting bores. These are the practical checks that help confirm the replacement matches the vehicle’s original starter layout and engagement setup.

Part number matching is the strongest verification point here. If the removed starter or the vehicle catalogue cross-reference shows 1986S00978, that is the clearest indication you are looking at the correct unit. If the part number differs, do not rely on appearance alone, as starter motors can look similar while differing in rotation, tooth count, or mounting arrangement.

The listed fitment references cover Audi Q7, Porsche Cayenne, Porsche Panamera, and Volkswagen Touareg applications, but model naming alone is not enough to guarantee compatibility. Engine variants, production years, and factory changes can affect starter selection, so it is worth checking the original starter, the vehicle details, and any catalogue notes before purchase.

Because this is an electrical rotating assembly, careful comparison before fitting is important. Confirm the unit is intended for 12V systems, that the mounting bores align with the existing installation points, and that the clockwise rotation matches the original starter’s direction. A correct match reduces the chance of installation issues and avoids unnecessary removal work.

Before supply, the safest approach is to confirm the original unit details against the listed part number, voltage, output rating, mounting arrangement, and pulley configuration. That checking process is standard practice in the parts trade because visually similar units can still differ in service-critical ways.

For workshop, fleet, and equipment applications, accurate identification of part number 1986S00978 helps avoid unnecessary freight, additional labour, and vehicle or machine downtime. Where the application is not straightforward, the original unit, OEM reference, or workshop records should be used as the primary confirmation point.

Relevant published details for this unit include Type STARTER MOTOR, Unit of Measure EACH, Warranty 24 Months, Rotation CW, Number of mounting bores 3, Packaging width 18, Manufactured in China, Product Group 1 ROTATING ELECTRICAL, Part No. 1986S00978, Brand BOSCH.

Additional published details for cross-checking include Description Bosch Starter Motor 12V 9Th CW, Number of Teeth 9, Voltage 12, Packaging length 32.5, Packaging height 13.9, Product Group 2 STARTER MOTORS.

Bosch Starter Motor 12V 9Th CW. Part number 1986S00978 should be checked first. Listed voltage is 12. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number 1986S00978, the normal identification sequence is part number, electrical rating, mounting arrangement, connector or terminal style, and pulley or drive details. Using those checkpoints helps confirm that the listed unit matches the service requirement rather than only looking similar.

For a starter motor in workshop, fleet, trade, agricultural, or construction service, the listed voltage 12 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include AUDI Q7, AUDI Q7 2007, AUDI Q7 2008, AUDI Q7 2009, PORSCHE CAYENNE, PORSCHE CAYENNE 2011. Even with application listings, final confirmation should still be based on the exact unit being replaced and the service requirements of the vehicle or machine.

Compatibility note: Confirm fitment by comparing part number 1986S00978, 12V specification, clockwise rotation, 9 tooth count, and 3 mounting bores against the original starter and vehicle application details before purchase.

FAQ

What type of part is this?

It is a Bosch starter motor, listed as an original equipment part and supplied as one each. For this listing, part number 1986S00978 is the main reference point. Listed voltage is 12. Published fitment references include AUDI Q7, AUDI Q7 2007, AUDI Q7 2008. These details should still be checked against the original unit before ordering.

What voltage does this starter motor use?

The listed voltage is 12V. For this listing, part number 1986S00978 is the main reference point. Listed voltage is 12. Published fitment references include AUDI Q7, AUDI Q7 2007, AUDI Q7 2008. These details should still be checked against the original unit before ordering.

What is the rotation direction?

This starter motor is clockwise rotation, shown as CW. For this listing, part number 1986S00978 is the main reference point. Listed voltage is 12. Published fitment references include AUDI Q7, AUDI Q7 2007, AUDI Q7 2008. These details should still be checked against the original unit before ordering.

How many teeth does the pinion have?

The pinion has 9 teeth. For this listing, part number 1986S00978 is the main reference point. Listed voltage is 12. Published fitment references include AUDI Q7, AUDI Q7 2007, AUDI Q7 2008. These details should still be checked against the original unit before ordering.

How many mounting bores are listed?

There are 3 mounting bores listed for this starter motor. For this listing, part number 1986S00978 is the main reference point. Listed voltage is 12. Published fitment references include AUDI Q7, AUDI Q7 2007, AUDI Q7 2008. These details should still be checked against the original unit before ordering.

Which vehicles are referenced for fitment?

Fitment references include Audi Q7, Porsche Cayenne, Porsche Panamera, and Volkswagen Touareg applications. Confirm the exact part number and vehicle details before ordering. For this listing, part number 1986S00978 is the main reference point. Listed voltage is 12. Published fitment references include AUDI Q7, AUDI Q7 2007, AUDI Q7 2008. These details should still be checked against the original unit before ordering.