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Outboard Motor Parts | OEM & Aftermarket
Shop OEM and aftermarket outboard motor parts for Mercury, Yamaha, Suzuki, Honda, Johnson / Evinrude / E-TEC, Tohatsu / Nissan, and Chrysler / Force engines. Pro Marine USA carries parts for routine maintenance, troubleshooting, repair, and complete marine engine rebuilds.
Browse by outboard manufacturer or engine system, or use our OEM parts lookup to identify the correct part number before ordering. Find cooling, fuel, ignition, electrical, internal engine, lower unit, steering, trim, service kit, gasket, seal, and rebuild parts in one place.
Shop Outboard Parts by Manufacturer
Chrysler / Force Outboard Parts for Chrysler and Force outboard repair 
Honda Outboard Honda cooling, fuel, electrical, and engine parts 
Johnson / Evinrude / E-TEC Outboard Johnson, Evinrude, E-TEC, and OMC replacement parts 
Mercury Outboard Mercury and Mariner maintenance, repair, and rebuild parts 
Suzuki Outboard Suzuki service, lower unit, fuel, and engine parts 
Tohatsu / Nissan Outboard Tohatsu and Nissan outboard replacement parts 
Yamaha Outboard Yamaha maintenance, repair, lower unit, and rebuild parts Find the Correct Outboard Part
Not sure which part fits your engine? Start with the engine manufacturer, horsepower, model number, serial number, and year whenever available.
Our OEM parts lookup lets you view factory parts diagrams and identify the original part number for many popular outboard engines. Once you have the OEM number, search Pro Marine to find available OEM and aftermarket replacement options.
Use Our OEM Parts Lookup »Shop Outboard Parts by Engine System
Outboard engines use several interconnected systems. Select your manufacturer above to browse the exact categories available for your engine, including the following common repair and maintenance areas.
Common Outboard Problems and Where to Start
- Engine overheating: inspect the water pump, impeller, thermostat, pressure-control components, cooling passages, and engine anodes.
- Hard starting or rough idle: check fuel delivery, carburetor or injector operation, spark plugs, ignition components, filters, and intake sealing.
- Weak spark or no spark: test ignition coils, stators, switch boxes or ignition modules, sensors, wiring, grounds, and related electrical components.
- Low compression or poor power: inspect pistons, rings, cylinder condition, head and powerhead gaskets, bearings, and other internal engine components.
- Milky gear lube: inspect prop shaft, driveshaft, shift shaft, bearing carrier, and other lower unit seals for water intrusion.
- Lower unit or gearcase noise: inspect bearings, gears, clutch components, shafts, and gear lube condition before continued operation.
- Trim or steering problems: inspect hydraulic fluid level, seals, hoses, trim motors, pumps, steering cylinders, and mechanical connections.
Why Buy Outboard Parts from Pro Marine USA?
- OEM and aftermarket replacement options for major outboard engine brands.
- Marine engine parts for routine maintenance, professional repair, and complete rebuild projects.
- OEM diagram and part-number lookup tools to help identify the correct component before ordering.
- Dealer pricing available for qualified marine repair businesses and dealers.
- Large selection of service kits, engine parts, lower unit components, fuel system parts, electrical parts, steering, and rigging products.
- Same-day weekday shipping available on qualifying in-stock orders placed before the shipping cutoff.
OEM and Aftermarket Outboard Parts
OEM parts are supplied by the original engine manufacturer and are designed for the specific engine application. Aftermarket parts are replacement components produced by independent marine parts manufacturers and may provide additional availability or value for many common repairs.
Pro Marine carries both genuine OEM parts and quality aftermarket replacement parts for many outboard maintenance, repair, and rebuild applications. Always confirm fitment using the engine model, serial number, horsepower, year range, or OEM part number when available.
Frequently Asked Questions
How do I find the correct parts for my outboard motor?
Start by identifying the engine manufacturer, horsepower, model number, serial number, and year. Select the manufacturer above to browse by engine system, or use the OEM parts lookup to locate the original part number from a factory diagram.
Can I search Pro Marine by OEM part number?
Yes. If you already have the OEM part number, enter it 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.
What information should I have before ordering an outboard part?
Have the engine manufacturer, horsepower, model number, serial number, and year whenever possible. An OEM part number from the original component or parts diagram is especially helpful because visually similar parts may fit different engine families.
What is the difference between OEM and aftermarket outboard parts?
OEM parts come from the original engine manufacturer. Aftermarket parts are replacement components manufactured by other marine parts companies for compatible applications. Pro Marine carries both OEM and aftermarket options across many common outboard engine systems.
Are aftermarket outboard motor parts reliable?
Quality aftermarket marine parts are commonly used for maintenance, professional repair, and engine rebuilding. The best option depends on the application, manufacturer, availability, and customer preference.
Do you carry parts for older outboard motors?
Yes. Pro Marine carries parts for many older Mercury, Mariner, Johnson, Evinrude, Chrysler, Force, Yamaha, Honda, Suzuki, Nissan, and Tohatsu outboards. Availability varies by engine family and component.
What outboard parts are commonly replaced during routine maintenance?
Common maintenance items include engine oil, oil filters, fuel filters, spark plugs, water pump impellers, complete water pump kits, thermostats, gear lube, drain plug seals, anodes, and manufacturer-specific service kit components.
Fitment Tip: Outboard parts can vary by model, serial range, horsepower, and production year. Confirm the OEM part number or engine identification information whenever possible before ordering.
Mercury Oil Drain Plug Assembly 8M0112869
The Mercury 8M0112869 Oil Drain Plug Assembly is an OEM replacement oil plug assembly used on a wide range of Mercury 4-stroke outboards. This assembly seals the engine oil drain point and helps prevent oil leaks after oil service or normal engine operation.
Fitment Overview
This oil drain plug assembly replaces Mercury OEM part numbers 8M0045813 and 8M0064964. Following the supersession chain shows fitment across Mercury EFI 4-stroke engines, 150HP 4-stroke models, newer V6 and V8 platforms, V10 models, and select Mercury Racing Verado applications.
Compatibility
| Engine Family | Horsepower | Engine Type |
|---|---|---|
| Mercury EFI / Jet | 65 Jet, 75, 80, 90, 100, 115 HP | 4-Stroke |
| Mercury 150 | 150 HP | 4-Stroke |
| Mercury 3.4L V6 | 175, 200 HP | 4-Stroke |
| Mercury 4.6L V8 | 200, 225, 250, 300 HP | 4-Stroke |
| Mercury V10 | 350, 400, 425 HP | 4-Stroke |
| Mercury Racing Verado | 300R 450R 500R | Racing 4-Stroke |
Fits These Serial Ranges
Known OEM supersession references include Mercury 65 Jet, 75 EFI, 80 EFI, 80 Jet, 90 EFI, 100 EFI, and 115 EFI 4-stroke models serial 2B095049 and up, plus Mercury 150HP 4-stroke models serial 1B905505 and up. Newer V6, V8, V10, and Racing applications should be confirmed by engine serial number or parts diagram before ordering.
Important: Always verify your engine serial number or original oil plug number before ordering.
Part Numbers and Cross References
| Type | Part Number |
|---|---|
| Mercury OEM | 8M0112869 |
| Mercury OEM | 8M0064964 |
| Mercury OEM | 8M0045813 |
| Replacement O-Ring | 863006 |
Need Only the O-Ring?
If the plug assembly itself is not damaged and you are only trying to stop or prevent a small oil leak, replacing the O-ring may be the cheaper repair.
View Mercury 863006 Oil Drain Plug O-Ring
What This Part Is Used For
This oil drain plug assembly seals the oil drain opening on compatible Mercury 4-stroke outboards. It is commonly serviced during oil changes or replaced when the plug, seal surface, or O-ring is worn or damaged.
- Seals the engine oil drain point
- Helps prevent oil leaks after service
- OEM replacement for Mercury 4-stroke applications listed above
- Works with replacement O-ring 863006
A damaged oil drain plug assembly or worn O-ring can cause oil seepage, especially after repeated oil changes.
System Function and Connections
- System Type: Engine lubrication / oil drain system
- Component Type: Oil drain plug assembly
- Related Component: Oil drain plug O-ring 863006
- Location: Engine oil drain point
FAQ
What does 8M0112869 replace?
It replaces Mercury OEM part numbers 8M0045813 and 8M0064964.
What engines does this oil drain plug assembly fit?
It fits a wide range of Mercury 4-stroke outboards including 65 Jet, 75, 80, 90, 100, 115, 150, V6, V8, V10, and select Racing Verado applications.
Do I need the full plug assembly or just the O-ring?
If the plug is cracked, stripped, damaged, or worn, replace the full assembly. If the plug is in good condition and only the seal is leaking, the 863006 O-ring may be enough.
Is this an OEM Mercury part?
Yes, 8M0112869 is an OEM Mercury oil drain plug assembly.
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.
- 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 Part Numbers
8M0112869, 8M0064964, 8M0045813, 863006, Mercury oil drain plug assembly, Mercury oil drain plug O-ring, Mercury 115 oil drain plug, Mercury 150 oil plug, Mercury V6 oil drain plug, Mercury V8 oil drain plug, Mercury V10 oil drain plug, Mercury Verado oil plug, Pro XS oil plug, SeaPro oil drain plug
8M0064964
8M0112869
61A-W0078-A1-00
61A-W0078-A2-00
61A-W0078-A3-00
61A-W0078-A4-00
61A-W0078-00-00
61A-W0078-01-00
61A-44311-00-00
61A-44311-01-00
64L-W0078-00-00
65L-W0078-A0-00
65L-W0078-A1-00
68V-W0078-00-00
68V-W0078-01-00
8M6012787
8M6012803
8M6012804
8M0118177
8M0141827
881862T
881862T08
892874T01
899106T01
60X-44555-00-94
Mercury Belt Tensioner Assembly
Mercury 8M0164060 Tensioner Assembly
The Mercury 8M0164060 Tensioner Assembly is used in the belt drive system to help maintain proper belt tension and pulley alignment. A worn tensioner or pulley can lead to belt noise, slipping, uneven belt wear, or charging and accessory drive issues.
When replacing this tensioner assembly, it is usually a good idea to inspect and replace the belt at the same time. The related Mercury 8M0159595 belt is linked below.
Compatible Applications
| Engine / Application | Part Number |
|---|---|
| Mercury 450R V8 belt drive system | 8M0164060 |
Verify your engine serial number and original tensioner part number before ordering. Mercury belt drive components can vary by model and serial range. The related belt listed by Pro Marine is identified as fitting Mercury 450R V8.
OEM & Cross Reference Numbers
| Type | Part Number |
|---|---|
| Mercury OEM | 8M0164060 |
Related Belt Replacement
Mercury 8M0159595 Belt - Mercury 450R V8
It is common to replace the belt when servicing the tensioner or pulley. A worn belt can cause slipping, noise, poor charging performance, or premature wear on the new tensioner assembly.
What This Part is Used For
The belt tensioner assembly keeps proper tension on the engine belt so the belt can drive related engine accessories correctly. If the tensioner weakens, binds, or the pulley wears out, the belt may slip, squeal, track incorrectly, or wear faster than normal.
Replacing the tensioner assembly helps restore proper belt control. Because the belt rides directly on the pulley system, replacing the belt during the same service is often recommended.
Key Features and Benefits
- Mercury OEM tensioner assembly
- Part number 8M0164060
- Helps maintain correct belt tension
- Supports proper belt tracking and accessory drive operation
- Useful when repairing belt noise, slipping, or pulley wear
- Related Mercury 8M0159595 belt linked above
- Recommended to inspect or replace the belt during tensioner service
Common Signs of a Worn Tensioner or Belt
| Symptom | Possible Cause |
|---|---|
| Belt squeal or chirping | Weak tensioner, worn pulley, glazed belt, or misalignment |
| Visible belt wear | Pulley wear, improper tracking, or old belt |
| Belt slipping | Loss of tension or worn belt surface |
| Pulley noise | Worn bearing or damaged tensioner pulley |
FAQ
What is the OEM number for this tensioner?
The OEM part number is 8M0164060.
Should I replace the belt when replacing the tensioner?
Yes, it is usually recommended to inspect and replace the belt when servicing
the tensioner or pulley, especially if the belt shows wear, glazing, cracking,
noise, or slipping.
Which belt goes with this tensioner?
The related belt is Mercury 8M0159595, linked above.
What does the tensioner assembly do?
It keeps the engine belt under proper tension so the belt can drive related
engine accessories correctly.
Can a bad tensioner damage a new belt?
Yes. A worn or misaligned tensioner can cause premature belt wear, belt noise,
or belt tracking problems.
Do I need to verify fitment?
Yes. Always verify your engine serial number and original part number before
ordering Mercury belt drive components.
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
8M0164060, Mercury 8M0164060, Mercury tensioner assembly, Mercury belt tensioner, Mercury pulley tensioner, Mercury 450R tensioner, Mercury 450R V8 tensioner, Mercury Racing 450R tensioner, Mercury belt drive tensioner, outboard belt tensioner, Mercury belt pulley, 8M0159595, Mercury 8M0159595, Mercury 450R V8 belt, Mercury belt replacement, tensioner and belt replacement
17400-88L00
17400-88L01
8M6012810
835290A1
835290Q1
850515
6E5-W0093-10-00
6G5-W0093-00-00
6G5-W0093-01-00
6G5-W0093-02-00
6G5-W0093-07-00
6G5-W0093-08-00
6G7-W0093-00-00
6BL-14301-01-00
6BL-14301-02-00
6BL-14301-03-00
6BL-14301-04-00
6BL-14301-05-00