Sierra Starter 18-5910, Replaces OMC 984456/986505, GM V-6 & V-8 Bottom Mount, 14 1/4 Inch Flywheel

The Sierra 18-5910 is a bottom mount starter built for GM V-6 and V-8 marine engines used in OMC Sterndrive and OMC Cobra applications with a 14 1/4 inch flywheel. It is a standard rotation unit, meaning it turns clockwise, matching the rotation required by these OMC Sterndrive and Cobra engine setups. The housing and internal components are metal construction for durability in the marine engine compartment environment.

This starter is built to SAE J1171 standard, the marine industry specification covering ignition protection for starters and other electrical components used in gasoline marine engine spaces, so it is designed to resist becoming a source of ignition for surrounding fuel vapors. If the starter solenoid ever needs replacing separately, Sierra offers a matching replacement solenoid, part number 18-5837, for this starter.

Because rotation direction and mounting position are specific to the engine it is installed on, confirm your engine uses standard (clockwise) rotation with a bottom mount configuration and a 14 1/4 inch flywheel before ordering, since installing a starter with the wrong rotation will not engage the flywheel correctly.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-5910
• Product Type: Starter
• Rotation: Standard (clockwise)
• Flywheel Size: 14 1/4 inches
• Mounting: Bottom mount
• Engine Compatibility: GM V-6 and V-8 engines
• Application: OMC Sterndrive and OMC Cobra starters
• Material: Metal
• Weight: 19.34 pounds
• Industry Standard: SAE J1171
• Replacement Solenoid: 18-5837
• UPC: 030999875945

Fitment

• OMC Sterndrive and OMC Cobra starters
• GM V-6 and V-8 engines
• Standard rotation engines (clockwise)
• 14 1/4 inch flywheel, bottom mount

Replaces (OEM)

• 984456
• 986505

Frequently Asked Questions

What engines does the Sierra 18-5910 starter fit? The Sierra 18-5910 fits GM V-6 and V-8 engines used in OMC Sterndrive and OMC Cobra applications with a 14 1/4 inch flywheel and bottom mount configuration.

Is the 18-5910 a standard or reverse rotation starter? It is a standard rotation starter, meaning it turns clockwise. This is important because OMC Sterndrive and Cobra engines require matching rotation direction for the starter to engage the flywheel properly.

What OEM part numbers does the Sierra 18-5910 replace? The Sierra 18-5910 replaces OMC 984456 and 986505.

What size flywheel does this starter require? The Sierra 18-5910 is designed for engines with a 14 1/4 inch flywheel.

How is the Sierra 18-5910 mounted on the engine? This starter uses a bottom mount configuration, matching the mounting style of the OMC Sterndrive and OMC Cobra engines it is built for.

What is the Sierra 18-5910 starter made of? The 18-5910 starter has a metal housing and internal components, built for durability in a marine engine compartment.

How much does the Sierra 18-5910 weigh? The Sierra 18-5910 starter weighs 19.34 pounds.

Does the Sierra 18-5910 meet marine safety standards? Yes, the 18-5910 is built to SAE J1171, the marine standard for ignition protection on starters and electrical components used in gasoline engine spaces.

Can the solenoid on the 18-5910 be replaced separately? Yes, Sierra offers a matching replacement solenoid for the 18-5910 starter under part number 18-5837.

Is the Sierra 18-5910 an aftermarket or genuine part? The 18-5910 is a Sierra branded starter manufactured as a direct replacement for OMC 984456 and 986505, built to the same SAE J1171 marine standard.

Will the 18-5910 work on reverse rotation engines? No, the 18-5910 is a standard (clockwise) rotation starter and is built for standard rotation engines, not reverse rotation applications.

What comes with the Sierra 18-5910 starter? The Sierra 18-5910 ships as a complete starter unit ready to install on compatible GM V-6 and V-8 OMC Sterndrive and OMC Cobra engines.