863007A1 50-863007a1 3860566 3885317 Mercruiser / Volvo Penta Starter Motor | Genuine Used Part

🔧 Product Description

Genuine MerCruiser / Volvo Penta Marine Starter Motor - Part Number: 50-863007A1

A genuine marine starter motor used across MerCruiser, Volvo Penta and OMC petrol inboard / sterndrive applications. This 12-volt, 11-tooth permanent-magnet gear-reduction starter is commonly used on GM-based 4-cylinder, V6 and V8 marine petrol engines with the matching 14-inch flywheel and starter mounting pattern.

⚙️ Key Features

• Genuine marine starter motor
• Correct MerCruiser reference 50-863007A1
• Cross-references with Volvo Penta 3885317 and OMC 3860566
• 12-volt, 11-tooth gear-reduction starter
• SAE J1171 marine ignition-protected starter family

🚤 Compatibility

Commonly used on

• MerCruiser GM-based petrol sterndrive and inboard engines
• Volvo Penta GM-based petrol sterndrive and inboard engines
• OMC Cobra GM-based petrol sterndrive engines

Typically suits

• Engine models:
• MerCruiser 3.0L 4-cylinder petrol engines, 1999 and newer starter-family applications
• MerCruiser 4.3L GM V6 petrol engines using 14-inch flywheel starter layout
• MerCruiser 5.0L GM V8 petrol engines using 50-863007A1
• MerCruiser 5.7L GM V8 petrol engines using 50-863007A1
• MerCruiser 6.2L / 377 MAG GM V8 petrol engines using 50-863007A1
• MerCruiser 7.4L / 454 GM V8 petrol engines using 50-863007A1
• MerCruiser 8.1L / 496 GM V8 petrol engines using 50-863007A1
• MerCruiser 8.2L / 502 GM V8 petrol engines using 50-863007A1
• Volvo Penta GM 4-cylinder, V6 and V8 petrol engines using 3885317 / 3857747
• OMC Cobra GM petrol sterndrive engines using 3860566 starter family
• Engine Type: GM-based marine petrol inboard / sterndrive
• Year Range: approximately mid-1990s onward depending on engine and starter mounting pattern
• Starter Type: 12V, 11-tooth, clockwise rotation, gear-reduction marine starter

🔌 Function

The starter motor engages the flywheel ring gear and cranks the petrol marine engine during electric starting. Its ignition-protected marine design is intended for petrol engine compartments.

⚠️ Common Signs of Failure

• Starter clicks but does not crank
• Slow cranking despite charged battery
• Starter gear grinding or not engaging
• Heat-soak starting issue
• Excessive current draw
• Worn solenoid contacts, brushes, armature, bearings or pinion gear

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 50-8M8021116 later related MerCruiser starter motor reference
• 50-863007A1 MerCruiser starter motor assembly reference
• 807904A1 related MerCruiser starter reference
• 806964A3 related MerCruiser starter reference
• 806964A2 related MerCruiser starter reference
• 812604A2 related MerCruiser starter reference
• 814472 related MerCruiser starter reference
• 12177A2 related MerCruiser starter reference

OEM / Related Numbers

• 50-863007A1
• 863007A1
• 50-8M8021116
• 8M8021116
• 807904A1
• 806964A3
• 806964A2
• 812604A2
• 814472
• 12177A2
• OMC: 3860566
• Volvo Penta: 3885317
• Volvo Penta: 3857747
• Crusader: RA122015

Aftermarket / Verified Equivalents

• Sierra: 18-6275
• Sierra: 18-5913
• API Marine: PH140-0017-D
• Recmar: REC50-863007A1
• Aftermarket reference: PH1400017D

📦 Condition

• Genuine used part
• Removed from running engine where applicable
• In good working condition unless otherwise stated