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Outboard Motor Parts | Mercury, Yamaha, Suzuki & More
Shop outboard motor parts for maintenance, repair, troubleshooting, and full marine engine rebuild projects. This category includes OEM parts and quality OEM specification aftermarket products from Pro Marine, along with replacement marine parts for Chrysler Force, Honda, Johnson Evinrude E-tec, Mercury, Suzuki, Tohatsu Nissan, and Yamaha outboard engines.
Use this section to browse outboard parts by brand and engine system, including cooling, fuel delivery, ignition and electrical, intake, internal engine components, lower unit parts, steering, trim, transom, midsection, engine oil, service kits, gaskets, seals, carburetor parts, water pump parts, and rebuild components.
Shop Outboard Categories
Chrysler / Force Outboard Parts for Chrysler and Force outboard repair 
Honda Outboard Honda cooling, fuel, electrical, and engine parts 
Johnson / Evinrude / E-tec Outboard OMC, Johnson, Evinrude, and E-tec parts 
Mercury Outboard Mercury and Mariner service and rebuild parts 
Suzuki Outboard Suzuki maintenance, lower unit, and engine parts 
Tohatsu / Nissan Outboard Tohatsu and Nissan outboard replacement parts 
Yamaha Outboard Yamaha service, repair, and rebuild parts Common Outboard Parts Found in This Category
- Water pump kits, impellers, thermostats, and cooling system parts
- Carburetor kits, fuel pumps, fuel filters, and fuel system components
- Ignition coils, stators, switch boxes, rectifiers, sensors, and electrical parts
- Pistons, piston rings, bearings, crankshafts, sleeves, gaskets, and rebuild parts
- Lower unit seals, bearings, gears, driveshaft parts, and gearcase components
- Steering parts, control cables, trim parts, and transom components
- Engine oil, gear lube, service kits, spark plugs, seal kits, and routine maintenance parts
Common Outboard Problems and Where to Start
- Overheating: inspect the water pump, impeller, thermostat, cooling passages, and engine anodes.
- Hard starting or rough idle: check carburetor parts, fuel delivery, ignition components, spark plugs, and intake sealing.
- Weak spark or no spark: test ignition coils, stators, switch boxes, sensors, wiring, and related electrical components.
- Low compression or poor power: inspect pistons, rings, gaskets, cylinder condition, bearings, and internal engine components.
- Milky gear lube or gearcase noise: check lower unit seals, bearings, gears, driveshaft parts, and prop shaft components.
Frequently Asked Questions
What is the difference between OEM and aftermarket outboard parts?
OEM parts are made by the original engine manufacturer. Aftermarket parts are replacement parts made by other manufacturers to fit the same application. Pro Marine provides quality OEM specification aftermarket products designed for marine maintenance, repair, and rebuild work.
How do I find parts for my outboard engine?
Start by selecting your outboard brand, then choose the correct engine system category. Use your model number, serial number, horsepower, and year range to confirm fitment before ordering parts.
What information do I need before ordering outboard parts?
You should have the engine manufacturer, horsepower, model number, serial number, and any OEM part numbers from the original component when available. This helps avoid ordering parts that look similar but fit a different engine family.
Are aftermarket outboard parts reliable?
Yes, quality aftermarket outboard parts are commonly used by marine mechanics and rebuilders. Pro Marine offers OEM specification aftermarket products for many common outboard repair, maintenance, and rebuild applications.
What brands are included in the outboard category?
This category includes Chrysler Force, Honda, Johnson Evinrude E-tec, Mercury, Suzuki, Tohatsu Nissan, and Yamaha outboard parts.
Tip: Before ordering outboard parts, confirm your engine brand, horsepower, model number, serial number, and year range whenever possible.
OEM Mercury Racing 500R Thermostat Assembly
Mercury Thermostat Assembly 8M0210477 For 500R V8 Outboards
The Mercury 8M0210477 thermostat assembly is a genuine OEM Mercury Racing cooling system component used on Mercury Racing 500R 4.6L V8 FourStroke outboards.
This thermostat helps maintain proper engine operating temperature by regulating coolant flow through the engine cooling system. Replacing a worn or sticking thermostat helps maintain performance, fuel efficiency, and cooling system reliability.
Compatible Applications
| Engine Family | Horsepower | Engine Platform | Serial Number Range |
|---|---|---|---|
| Mercury Racing | 500R | 4.6L V8 FourStroke | 1E099432 & Newer |
Mercury thermostat assembly 8M0210477 fits Mercury Racing 500R 4.6L V8 FourStroke outboards with serial numbers 1E099432 and newer.
Always verify your engine serial number before ordering cooling system components.
Related Intake Hose Clamp
Mercury recommends replacing damaged hose clamps during cooling system service. The intake hose clamp kit below is commonly serviced along with thermostat-related repairs.
Mercury Intake Hose Clamp Kit
OEM Mercury clamp kit 888988008. Includes two intake hose clamps commonly serviced during cooling system maintenance and thermostat replacement.
View ProductOEM Part Numbers
| Brand | Part Number |
|---|---|
| Mercury Marine | 8M0210477 |
What This Thermostat Does
The thermostat regulates engine operating temperature by controlling the flow of cooling water through the engine.
A properly functioning thermostat helps the engine reach and maintain the correct operating temperature while protecting internal components from overheating.
Thermostats are commonly inspected and replaced during major scheduled maintenance intervals on high-performance Mercury Racing engines.
Key Features and Benefits
- Genuine OEM Mercury Racing thermostat assembly
- Fits Mercury Racing 500R 4.6L V8 outboards
- Fits serial number 1E099432 and newer
- 160° thermostat assembly
- Helps maintain proper engine operating temperature
- Supports cooling system efficiency and reliability
- Direct OEM replacement part
- Used during scheduled cooling system maintenance
Part Details
- Part Number: 8M0210477
- Product Type: Thermostat Assembly
- Brand: Mercury Marine
- Application: Mercury Racing 500R
- Engine: 4.6L V8 FourStroke
- Serial Range: 1E099432 & Newer
- OEM Mercury Part: Yes
FAQ
What engine does Mercury thermostat 8M0210477 fit?
This thermostat fits Mercury Racing 500R 4.6L V8 FourStroke outboards
with serial numbers 1E099432 and newer.
How many thermostats does a Mercury 500R use?
Mercury 500R engines using this application require one thermostat assembly.
What does a thermostat do?
The thermostat regulates engine operating temperature by controlling
cooling water flow through the engine.
Should I replace hose clamps during cooling system service?
Inspect hose clamps whenever servicing the cooling system. Replace damaged
or corroded clamps as needed.
Is this a genuine Mercury part?
Yes. This is an OEM Mercury Marine thermostat 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.
- Parts must be new, unused, and in original packaging.
- Installed cooling system components 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
8M0210477, Mercury 8M0210477, Mercury thermostat assembly, Mercury 500R thermostat, Mercury Racing thermostat, Mercury 500R cooling system, Mercury 500R thermostat replacement, Mercury 500R V8 thermostat, Mercury Racing 500R cooling parts, Mercury Racing cooling system, Mercury thermostat 1E099432, Mercury 500R maintenance, Mercury cooling system service, 888988008, Mercury intake hose clamp, Mercury thermostat housing, Mercury OEM thermostat
6Y5-8350T-D1-00
6Y5-8350T-D2-00
6Y5-8350T-D3-00
6Y5-8350T-E0-00
6Y5-8350T-E1-00
6Y5-8350T-E2-00
6Y5-8350T-00-00
6Y5-8350T-01-00
6Y5-8350T-80-00
6Y5-8350T-81-00
6Y5-8350T-82-00
6Y5-8350T-83-00
6Y5-83500-T0-00
6Y5-83500-T1-00
6Y5-83500-T2-00
90280-03M07-00
90280-03003-00
90280-03024-00
90820-03024-00
6 Cylinder
90hp Crossflow 1983-1986
115hp Crossflow 1983-1988
2.0L
135hp 2.0L 1986-1999
150hp 2.0L XR2 1986-1988
150hp 2.0L 1978-1999
175hp 2.0L 1976-1981
2.4L
150hp 2.4L XR-4 1988-1992
175hp 2.4L 1981-1999
175hp 2.4L XR-4 1991-1992
200hp 2.4L 1978-1990
220hp 2.4L 1987-1988
2.5L
Jet 105 1992-1999
Jet 140 1992-1999
150hp 2.5L EFI 1992-1999
150hp 2.5L Pro Max 1994-1998
175hp 2.5L EFI 1992-1999
200hp 2.5L 1991-1999
200hp 2.5L Pro Max 1994-2006
225hp 2.5L Pro Max 1994-2004
18-5798-1
68162A1
68162A5
68162A8
96455A1
96455A10
96455A11
96455A6
96455A9
6P2-85780-01-00
61A-85780-01-00
EFI
75hp 1B366823 Thru 2B094995
80hp 1B366823 Thru 2B094995 / Op459572 Thru 2B094995
90hp 1B366823 Thru 2B094995
100hp 0P459572 Thru 2B094995 / 1b366823 thru 2b094995
115hp 1b366823 thru 2b094995
Verado
Inline 4 L4 / Inline 6 L6
135hp
150hp
175hp
200hp
225hp
250hp
275hp
300hp
350hp
400hp
400R
V6 4 Stroke
175hp
175hp Pro XS
200Hp Apex
200hp
200hp Sea Pro
225hp
V8 4 Stroke
200hp Pro XS
225hp Pro XS
225hp Sea Pro
250hp
250hp Pro XS
250hp Verado V8
250R 4.6L
300hp
300hp Pro XS
300hp Sea Pro
300hp Verado V8
300hp Verado Seapro V8
300R AMS
300R CMS
360hp Race
450R 1E083006 & Up
V10
350hp 5.7L V10
400hp 5.7L V10
400hp 5.7L V10 Verado
V12
500hp Sea Pro V12
600hp V12
Mariner
135hp
150hp
175hp
200hp
225hp
275hp
300hp
Mercruiser
9.0L 552 V8
8M0233140
880609
