Starter Fits Mercruiser Model 3.0 4.3 496 5.0 5.7 3660566-3 50-863007A1 9000840

Product Overview

This Starter Motor Assembly is engineered to provide reliable cranking and ignition for a wide range of marine inboard and sterndrive engines. This starter motor assembly features a permanent magnet gear reduction design to deliver high torque output while drawing less current from your marine battery system. This replacement unit is ideal for boat owners and marine technicians looking to restore dependable starting performance to their vessels.

Key Features & Performance

• Permanent magnet gear reduction design provides superior engine cranking torque
• Features a clockwise rotation with an 11 tooth drive pinion for optimal mesh
• Equipped with standard staggered offset mounting holes spaced for 14 inch flywheels
• Ignition protected design meets standard requirements for safe operation in marine engine compartments

Fitment & Compatibility

• Compatible with for MerCruiser 3.0L 4-cylinder sterndrive engines from 1999 and newer
• Compatible with for MerCruiser 4.3L V6 engines from the mid-1980s to current models
• Compatible with for MerCruiser 5.0L and 5.7L small block V8 marine engines
• Matches replacement and interchange part numbers 50-863007A1, 3660566-3, 9000840, 9000851, and 9000884

Common Uses

• Replacement component for failed or weakened starter motors on compatible inboard marine engines
• Restores rapid engine turnover on boats experiencing slow cranking or solenoid clicking
• Routine maintenance replacement during complete marine engine overhauls and rebuilds

Technical Specifications

• Product Type: Starter Motor Assembly
• Part Number(s): 50-863007A1, 3660566-3, 9000840
• Brand Compatibility: for MerCruiser
• Model Compatibility: 3.0, 4.3, 496, 5.0, 5.7
• Voltage: 12V
• Rotation: Clockwise

Frequently Asked Questions

Q: How can I ensure this starter fits my specific marine engine layout? A: Compare your existing unit against the provided part numbers and ensure your engine utilizes a bottom-mounted, offset 2-bolt mounting pattern with a 14-inch flywheel.

Q: Does this starter assembly include the necessary installation bolts or mounting nuts? A: This unit is supplied as the starter motor assembly alone and requires you to reuse your original hardware or source compatible mounting fasteners separately.

Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number, model year, or existing part number. Verify fitment before purchase.