Bosch Starter Motor 12V 13TH CW Part No. 1986S00857

The Bosch Starter Motor 12V 13Th CW is a rotating electrical component supplied as a single each unit, with part number 1986S00857. It is described as a Bosch starter motor with a 12V specification and 13th clockwise configuration, and it has 2 mounting bores for installation matching where that style is required.

This starter motor is listed under Bosch in the Starter Motors product group, and it carries a 12 month warranty. It is manufactured in China and packaged at 32.5 cm long, 18 cm wide and 13.9 cm high, which is useful when checking storage, freight, or workshop handling before purchase.

Key Features

• Bosch starter motor, 12V
• 13th clockwise configuration
• 2 mounting bores
• Designed to meet OE starter fit and performance
• Built for harsh environments
• Premium starting performance

Specifications

• Brand: Bosch
• Product type: Starter Motor
• Part No.: 1986S00857
• Voltage: 12V
• Rotation/configuration: 13Th CW
• Number of mounting bores: 2
• Warranty: 12 Months
• Unit of measure: Each

Fitment information

• Listed fitment references include Mercedes-Benz applications.
• Mercedes-Benz C-Class applications are shown in the fitment data, including model year references from 2007 through 2014.
• Mercedes-Benz E-Class applications are shown in the fitment data, including model year references from 2009 through 2010.
• Mercedes-Benz SLK applications are shown in the fitment data.
• Fitment should be confirmed against the part number 1986S00857 and the vehicle’s starter specification before ordering.

Application and Buying Notes

Before ordering, confirm the starter motor details against the vehicle’s existing unit and application notes. The key identifiers here are Bosch, part number 1986S00857, 12V, 13th CW, and 2 mounting bores. Those details need to line up with the vehicle because starter motors are commonly affected by voltage, rotation direction, mounting pattern, and application-specific design.

The listed fitment references point to Mercedes-Benz C-Class, E-Class and SLK applications, but the exact model, year and engine combination still need to be checked on the vehicle. A visual match is not enough on its own. Compare the old starter’s part number, mounting bore count, and physical configuration with the replacement before finalising the purchase.

Packaging size is 32.5 cm by 18 cm by 13.9 cm, which may help with freight planning or workshop storage, but it does not confirm compatibility. The warranty is 12 months, and the unit is supplied individually as each, so it is worth checking quantities and any return conditions before the order is placed.

The product is described as designed in fit and performance to meet OE starters, but that should still be treated as an application guide rather than a blanket guarantee. The safest approach is to verify the vehicle fitment details first, then compare the Bosch part number 1986S00857 with the original starter or any confirmed cross-reference already used for the vehicle.

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 1986S00857 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 12 Months, Packaging length 32.5, Packaging height 13.9, Product Group 2 STARTER MOTORS, Part No. 1986S00857, Brand BOSCH, Description Bosch Starter Motor 12V 13Th CW.

Bosch Starter Motor 12V 13Th CW. Part number 1986S00857 should be checked first. These details form the core reference points used by parts interpreters when confirming the correct replacement.

For part number 1986S00857, 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 electrical specification should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include MERCEDES-BENZ C-CLASS, MERCEDES-BENZ C-CLASS 2007, MERCEDES-BENZ C-CLASS 2008, MERCEDES-BENZ C-CLASS 2009. 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.

The listed warranty is 12 Months. Warranty terms should be considered alongside correct application and part identification, as warranty does not replace fitment confirmation.

Compatibility note: Please confirm fitment using Bosch part number 1986S00857, 12V, 13th CW configuration, and the vehicle application details before buying. If any of those identifiers do not match the existing starter or the vehicle’s required specification, the part should not be assumed to fit.

FAQ

What is the part number for this Bosch starter motor?

The part number listed is 1986S00857. For this listing, part number 1986S00857 is the main reference point. Published fitment references include MERCEDES-BENZ C-CLASS, MERCEDES-BENZ C-CLASS 2007, MERCEDES-BENZ C-CLASS 2008. These details should still be checked against the original unit before ordering.

What voltage is this starter motor?

It is a 12V starter motor. For this listing, part number 1986S00857 is the main reference point. Published fitment references include MERCEDES-BENZ C-CLASS, MERCEDES-BENZ C-CLASS 2007, MERCEDES-BENZ C-CLASS 2008. These details should still be checked against the original unit before ordering.

What does 13Th CW mean?

It identifies the starter’s configuration as 13th clockwise. That specification should be matched with the vehicle’s required starter setup before purchase. For this listing, part number 1986S00857 is the main reference point. Published fitment references include MERCEDES-BENZ C-CLASS, MERCEDES-BENZ C-CLASS 2007, MERCEDES-BENZ C-CLASS 2008. These details should still be checked against the original unit before ordering.

How many mounting bores does it have?

It has 2 mounting bores. For this listing, part number 1986S00857 is the main reference point. Published fitment references include MERCEDES-BENZ C-CLASS, MERCEDES-BENZ C-CLASS 2007, MERCEDES-BENZ C-CLASS 2008. These details should still be checked against the original unit before ordering.

What warranty is supplied with this part?

The listed warranty is 12 months. For this listing, part number 1986S00857 is the main reference point. Published fitment references include MERCEDES-BENZ C-CLASS, MERCEDES-BENZ C-CLASS 2007, MERCEDES-BENZ C-CLASS 2008. These details should still be checked against the original unit before ordering.

Which vehicles are referenced in the fitment data?

The fitment data references Mercedes-Benz applications, including C-Class, E-Class and SLK model groups. The exact model year and vehicle details should still be confirmed before ordering. For this listing, part number 1986S00857 is the main reference point. Published fitment references include MERCEDES-BENZ C-CLASS, MERCEDES-BENZ C-CLASS 2007, MERCEDES-BENZ C-CLASS 2008. These details should still be checked against the original unit before ordering.