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Mercury Outboard Parts
Shop OEM and aftermarket Mercury outboard parts for maintenance, repair, troubleshooting, and complete engine rebuild projects. Browse Mercury marine parts by system, including cooling, fuel delivery, electrical and ignition, internal engine components, lower unit parts, steering, trim, and routine service items.
Pro Marine USA carries Mercury outboard engine parts for a wide range of 2-stroke, FourStroke, EFI, Optimax, Pro XS, SeaPro, and Verado applications. Use your engine horsepower, model, serial number, or OEM part number whenever possible to confirm fitment before ordering.
Shop Mercury Outboard Parts by System
- Complete Powerheads
- Control Cables & Boxes
- Cooling System
- Cowlings & Components
- Electrical System
- Engine Oil
- Engine Rebuild Kits
- Fuel & Carburetion System
- Intake System
- Internal Engine Components
- Lower Unit Components
- Oiling System
- Paints
- Service & Oil Change Kits
- Service Manuals
- Steering Systems
- Throttle Components
- Transom & Midsection
- Trim System
- Wizard Performance Parts
Find the Correct Mercury Outboard Part
Mercury outboard parts can vary by horsepower, engine family, model year, and serial number range. If you are unsure which component fits your engine, use the OEM parts lookup to locate the original Mercury part number from an engine diagram.
Once you have the OEM part number, search Pro Marine to find available genuine Mercury and aftermarket replacement options.
Use Our OEM Parts Lookup »Common Mercury Outboard Engine Families
Pro Marine supports many Mercury outboard applications across a wide horsepower range. Always confirm the engine serial number and model information before ordering parts.
- Portable and Midrange: Mercury 2.5HP through 60HP 2-stroke and FourStroke applications
- FourStroke and EFI: common 75HP through 300HP Mercury EFI and FourStroke platforms
- Pro XS: performance-oriented Mercury Pro XS outboards across multiple engine families
- Optimax: direct-injected 2-stroke Mercury Optimax engines, commonly 75HP through 250HP
- Verado: supercharged and naturally aspirated Mercury Verado applications from 135HP through current high-horsepower platforms
- SeaPro: commercial-duty Mercury SeaPro outboards used in professional and high-hour applications
Common Mercury Outboard Repair Areas
- Overheating: inspect the water pump, impeller, thermostat, poppet valve, cooling passages, and related cooling components.
- Hard starting or rough running: inspect fuel pumps, filters, injectors or carburetors, spark plugs, coils, sensors, and intake components.
- No spark or intermittent ignition: check ignition coils, stators, switch boxes, trigger assemblies, sensors, grounds, and wiring.
- Low compression or power loss: inspect pistons, rings, cylinders, bearings, gaskets, reeds, and internal engine components.
- Lower unit noise or water intrusion: inspect seals, bearings, gears, shafts, bearing carriers, and gear lube condition.
- Trim or steering problems: inspect trim motors, pumps, hydraulic components, steering cylinders, hoses, and related rigging parts.
Why Buy Mercury Outboard Parts from Pro Marine USA?
- OEM Mercury and aftermarket replacement options for many common applications.
- Parts for maintenance, repair, engine rebuilding, lower units, electrical systems, fuel systems, steering, trim, and rigging.
- OEM diagram and part-number lookup tools to help identify the correct part before ordering.
- Dealer pricing available for qualified marine repair businesses and dealers.
- Large inventory of Mercury service parts and hard-to-find marine engine components.
- Fast weekday shipping on qualifying in-stock orders.
Frequently Asked Questions
How do I find the correct Mercury outboard part?
Use the engine horsepower, model, serial number, and year whenever available. Mercury frequently uses serial-number ranges to identify engine families, so the serial number is often the most reliable way to confirm fitment.
Can I search Mercury parts by OEM part number?
Yes. Enter the Mercury OEM part number into the Pro Marine site search to locate available OEM and aftermarket replacement options. If you do not know the part number, use the OEM parts lookup first.
Do Mercury outboard parts vary by serial number?
Yes. Many Mercury components change by serial-number range even within the same horsepower or model family. Always compare the serial range listed for the part with your engine before ordering.
Do you carry parts for Mercury Optimax and Verado engines?
Yes. Pro Marine carries parts for many Mercury Optimax, Verado, Pro XS, EFI, FourStroke, and SeaPro applications, including maintenance, fuel, electrical, cooling, internal engine, lower unit, steering, and rigging components.
Do you carry both OEM and aftermarket Mercury parts?
Yes. Pro Marine offers genuine Mercury parts along with aftermarket replacement parts for many common Mercury outboard maintenance, repair, and rebuild applications.
What Mercury outboard parts are commonly replaced during routine maintenance?
Common maintenance items include engine oil, oil filters, fuel filters, spark plugs, water pump kits, impellers, thermostats, gear lube, drain plug seals, anodes, and manufacturer-specific service kit components.
Fitment Tip: Mercury outboard parts often vary by serial-number range. Confirm your engine serial number and OEM part number whenever possible before ordering.
Electrical / Charging
Genuine Mercury Alternator Belt - 8M0178243
OEM Mercury Alternator Drive Belt for 350-425HP V10 and 500-600HP V12 outboards.
Ensures reliable alternator operation and proper charging of the electrical system.
Compatible Applications
| Brand | Engine | Horsepower | Fitment Note |
|---|---|---|---|
| Mercury | V10 | 350-425 HP | Alternator Drive Belt |
| Mercury | V12 | 500-600 HP | Alternator Drive Belt |
Important Fitment Note
Always confirm compatibility using your engine serial number before ordering.
OEM & Cross Reference Numbers
| OEM | 8M0178243 |
What This Part Is Used For
This belt drives the alternator on Mercury high-horsepower V10 and V12 outboards.
Replacing a worn belt prevents charging system failure and accessory drive slippage.
Key Features and Benefits
- Genuine Mercury OEM quality
- Designed for high-horsepower V10 & V12 engines
- High strength and heat resistance
- Ensures reliable electrical system performance
FAQ
What engines does this belt fit?
Mercury 350-425HP V10 and 500-600HP V12 outboards.
How often should the alternator belt be replaced?
Inspect at regular service intervals and replace if cracked, glazed, or stretched.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
Mercury V10 alternator belt, Mercury V12 alternator belt, 8M0178243, 350-425HP V10 belt, 500-600HP V12 belt
Searchable Part Numbers
8M0178243
8M4501491
812893
812893T
881889
881899
884410
896880
OEM Mercury EFI Oil Pump
Mercury 2.5L / 3.0L EFI Oil Pump Assembly
This OEM Mercury oil pump assembly fits select Mercury and Mariner 150HP-250HP EFI outboards along with compatible 240 EFI SportJet applications.
Mercury part number 8M0185615 supersedes several earlier EFI oil pump assemblies and is used on multiple Mercury 2.5L and 3.0L EFI powerhead platforms.
Compatible Applications
| Horsepower / Model | Engine Family | Engine Type | Application Notes |
|---|---|---|---|
| 150 EFI | Mercury / Mariner 2.5L | EFI 2-Stroke | Select serial-number applications |
| 175 EFI | Mercury / Mariner 2.5L | EFI 2-Stroke | Select EFI powerhead applications |
| 200 EFI | Mercury / Mariner 2.5L | EFI 2-Stroke | Select high-performance EFI models |
| 200 EFI | Mercury / Mariner 3.0L | EFI 2-Stroke | Select 3.0L EFI applications |
| 225 EFI | Mercury / Mariner 3.0L | EFI 2-Stroke | Select offshore and EFI applications |
| 250 EFI | Mercury / Mariner 3.0L | EFI 2-Stroke | Select 3.0L EFI applications |
| 225X EFI Pro Max | Mercury Racing 3.0L | High Performance EFI | Select Pro Max applications |
| SeaPro / Marathon | Mercury 3.0L | Commercial EFI | Select commercial-duty applications |
| 240 EFI / 240 EFI M2 | Mercury SportJet | EFI Jet Drive | Select SportJet powerhead applications |
Always verify your engine serial number before ordering internal engine lubrication components.
OEM Part Numbers & Supersessions
| Type | Part Number |
|---|---|
| Current Mercury OEM Number | 8M0185615 |
| Mercury Supersession | 8M0128081 |
| Mercury Supersession | 8M0101630 |
| Mercury Supersession | 879892T |
| Mercury Supersession | 879892T03 |
| Mercury Supersession | 879892T04 |
| Mercury Supersession | 879892T05 |
What This Oil Pump is Used For
This Mercury EFI oil pump circulates engine oil throughout the powerhead to lubricate crankshaft bearings, rods, pistons, internal rotating assemblies, and other critical engine components.
Proper oil pressure and oil flow are essential for protecting Mercury EFI 2-stroke engines from premature wear and engine damage.
Oil pump wear, contamination, internal scoring, or oil pressure problems can contribute to serious powerhead damage if not repaired promptly.
Oil pumps are commonly replaced during complete engine rebuilds, oil-pressure diagnosis, or major EFI powerhead repair work.
Key Features and Benefits
- OEM Mercury EFI oil pump assembly
- Fits select Mercury and Mariner 2.5L and 3.0L EFI outboards
- Compatible with 240 EFI SportJet applications
- Replaces multiple earlier Mercury oil pump assemblies
- Supports proper engine oil pressure and lubrication
- Critical internal engine lubrication component
- OEM Mercury fit and compatibility
- Common replacement during powerhead rebuild service
Oil Pump Details
- Brand: Mercury Marine
- Part Number: 8M0185615
- OEM Supersessions: 8M0101630, 8M0128081, 879892T, 879892T03, 879892T04, 879892T05
- Applications: Mercury / Mariner EFI 2-Stroke Outboards
- Compatible Engines: 2.5L & 3.0L EFI Platforms
- Compatible Models: EFI, Pro Max, SportJet, SeaPro, Marathon
- System: Engine Lubrication System
- Use: Engine oil circulation and oil pressure supply
FAQ
What engines does this oil pump fit?
This oil pump fits select Mercury and Mariner 150HP-250HP EFI 2-stroke outboards and 240 EFI SportJet models using the listed OEM numbers.
What OEM numbers does this replace?
This pump replaces Mercury part numbers 8M0101630, 8M0128081, 879892T, 879892T03, 879892T04, and 879892T05.
What does an oil pump do?
The oil pump circulates engine oil throughout the engine to lubricate and protect internal moving components.
What are symptoms of a failing oil pump?
Low oil pressure, internal engine noise, warning alarms, or poor lubrication can indicate oil pump problems.
Should engine serial number be verified before ordering?
Yes. Mercury used multiple oil pump variations depending on engine family and production range.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1–5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Internal engine lubrication components should be installed only by qualified technicians.
- Items must be new, unused, and in original packaging.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
8M0185615, 8M0128081, 8M0101630, 879892T, 879892T03, 879892T04, 879892T05, Mercury oil pump, Mercury EFI oil pump, Mercury 2.5L oil pump, Mercury 3.0L oil pump, Mercury SportJet oil pump, Mercury Pro Max oil pump, Mercury SeaPro oil pump, Mercury Marathon oil pump, OEM Mercury oil pump
8M0128081
8M0185615
879892T
879892T03
879892T04
879892T05
8M0168208
25hp OP153500 Thru OP388282
25hp 30hp 40hp OT409000 Thru 1B344298
30hp 40hp OP153500 Thru OP400999
40hp 1B227000 Thru 1B344306
40hp 1C018826 & Up
40hp OP401000 & Up
40hp 1C000001 Thru 1C018825
8M0141844
881862T07
881862T1
892874T
899106T