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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.
8M0142695
Mercury Verado Gen A/B Power Steering Hose Kit 8M0078213
Mercury Verado hydraulic power steering hose kit 8M0078213 for Verado systems using the Generation A / Generation B power steering pump. This kit includes both 16ft helm-to-pump hoses: the non-pressure return hose and the pressure-side hose.
Important Application Note
This hose kit is for Mercury Verado hydraulic power steering systems that use the Generation A / Generation B style power steering pump. Always verify your pump style, hose routing, and required hose length before ordering.
Compatible Applications
If you are converting, replacing, or refreshing a Verado Gen A/B hydraulic steering setup, confirm that 16ft hoses are the correct length for your boat layout.
What is Included
Recommended Damper Hose for Noise Reduction
The pressure-side fitting on this hose kit can connect directly into the Mercury Verado power steering pump. However, to help minimize steering system noise, it is recommended to install the Mercury damper hose between the pressure hose and the pump.
Recommended part: Mercury Verado Power Steering Damper Hose 897643A01 .
Related Verado Power Steering Parts
Shorter Verado Hose Kit
Need the shorter version of this Mercury Verado helm-to-power-steering-pump hose kit? Use 8M0078210 for the shorter hose option.
View Shorter Hose Kit
Verado Power Steering Damper Hose
Recommended between the pressure-side hose and the power steering pump to help reduce noise in Mercury Verado hydraulic steering systems.
View Damper Hose
Gen A/B Power Steering Pump Replacement
Replacement power steering pump option for Mercury Verado Generation A and Generation B hydraulic steering systems.
View Power Steering PumpWhat This Hose Kit is Used For
This Mercury Verado power steering hose kit connects the helm to the Generation A / Generation B power steering pump in a hydraulic Verado steering system. The kit includes both the pressure-side hose and the non-pressure return-side hose required for the helm-to-pump connection.
It is commonly used when replacing worn hoses, converting to a Gen A/B Verado pump setup, or completing a Mercury Verado hydraulic power steering repair.
Verado Power Steering Help
Mercury Verado Power Steering Walkthrough
Need help understanding Mercury Verado power steering pumps, hose routing, and Gen A/B steering system components? View our walkthrough for additional guidance before ordering.
View Verado Power Steering WalkthroughKey Features and Benefits
Includes both 16ft helm-to-pump hoses for pressure and non-pressure routing.
Designed for Mercury Verado systems using the Gen A / Gen B power steering pump style.
Pressure-side hose can connect directly to the pump, with damper hose recommended for noise reduction.
Useful for Verado power steering repairs, hose replacement, and Gen A/B pump conversion setups.
FAQ
What does this Mercury Verado hose kit include?
This kit includes a 16ft helm-to-power-steering-pump non-pressure hose and a 16ft helm-to-power-steering-pump pressure-side hose.
Does the pressure hose connect directly to the pump?
Yes, the pressure-side fitting can connect directly into the power steering pump. For noise reduction, Pro Marine recommends adding damper hose 897643A01 between the hose and pump.
What power steering pump does this hose kit work with?
This hose kit is intended for Mercury Verado hydraulic power steering systems using the Generation A / Generation B power steering pump style.
Is there a shorter version of this hose kit?
Yes. If you need the shorter Mercury Verado helm-to-pump hose kit, use 8M0078210.
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 Part Numbers
8M0078213, Mercury 8M0078213, Verado power steering hose, Mercury Verado helm to pump hose, Gen A power steering hose, Gen B power steering hose, Verado hydraulic steering hose, 897643A01, 8M0078210, 8M0134736P, Mercury Verado power steering pump, Verado damper hose
Mercury Verado Gen A/B Power Steering Hose Kit 8M0078210
Mercury Verado hydraulic power steering hose kit 8M0078210 for Verado systems using the Generation A / Generation B power steering pump. This kit includes both 10ft helm-to-pump hoses: the non-pressure return hose and the pressure-side hose.
Important Application Note
This 10ft hose kit is for Mercury Verado hydraulic power steering systems that use the Generation A / Generation B style power steering pump. Always verify your pump style, hose routing, and required hose length before ordering.
Compatible Applications
If you are converting, replacing, or refreshing a Verado Gen A/B hydraulic steering setup, confirm that 10ft hoses are the correct length for your boat layout.
What is Included
Recommended Damper Hose for Noise Reduction
The pressure-side fitting on this hose kit can connect directly into the Mercury Verado power steering pump. However, to help minimize steering system noise, it is recommended to install the Mercury damper hose between the pressure hose and the pump.
Recommended part: Mercury Verado Power Steering Damper Hose 897643A01 .
Related Verado Power Steering Parts
Longer 16ft Verado Hose Kit
Need the longer version of this Mercury Verado helm-to-power-steering-pump hose kit? Use 8M0078213 for the 16ft hose option.
View 16ft Hose Kit
Verado Power Steering Damper Hose
Recommended between the pressure-side hose and the power steering pump to help reduce noise in Mercury Verado hydraulic steering systems.
View Damper Hose
Gen A/B Power Steering Pump Replacement
Replacement power steering pump option for Mercury Verado Generation A and Generation B hydraulic steering systems.
View Power Steering PumpWhat This Hose Kit is Used For
This Mercury Verado power steering hose kit connects the helm to the Generation A / Generation B power steering pump in a hydraulic Verado steering system. The kit includes both the pressure-side hose and the non-pressure return-side hose required for the helm-to-pump connection.
It is commonly used when replacing worn hoses, converting to a Gen A/B Verado pump setup, or completing a Mercury Verado hydraulic power steering repair where a 10ft hose length is required.
Verado Power Steering Help
Mercury Verado Power Steering Walkthrough
Need help understanding Mercury Verado power steering pumps, hose routing, and Gen A/B steering system components? View our walkthrough for additional guidance before ordering.
View Verado Power Steering WalkthroughKey Features and Benefits
Includes both 10ft helm-to-pump hoses for pressure and non-pressure routing.
Designed for Mercury Verado systems using the Gen A / Gen B power steering pump style.
Pressure-side hose can connect directly to the pump, with damper hose recommended for noise reduction.
Useful for Verado power steering repairs, hose replacement, and Gen A/B pump conversion setups.
FAQ
What does this Mercury Verado hose kit include?
This kit includes a 10ft helm-to-power-steering-pump non-pressure hose and a 10ft helm-to-power-steering-pump pressure-side hose.
Does the pressure hose connect directly to the pump?
Yes, the pressure-side fitting can connect directly into the power steering pump. For noise reduction, Pro Marine recommends adding damper hose 897643A01 between the hose and pump.
What power steering pump does this hose kit work with?
This hose kit is intended for Mercury Verado hydraulic power steering systems using the Generation A / Generation B power steering pump style.
Is there a longer version of this hose kit?
Yes. If you need the longer 16ft Mercury Verado helm-to-pump hose kit, use 8M0078213.
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 Part Numbers
8M0078210, Mercury 8M0078210, Verado power steering hose, Mercury Verado helm to pump hose, Gen A power steering hose, Gen B power steering hose, Verado hydraulic steering hose, 897643A01, 8M0078213, 8M0134736P, Mercury Verado power steering pump, Verado damper hose, 10ft Verado hose kit
6 Cylinder
V6
135hp Optimax 2.5L
140hp Jet 2.5L
150hp Optimax 2.5L
175hp EFI 2.5L
175hp 2.5L Optimax
200hp 3.0L Optimax
134-645618
134645618
96455A18
96455T18
893371T20
893371T30
893371T10
6hp
8hp
9.9hp
10hp
15hp
18hp
20hp
25hp
98450A1
98450A10
98450A3
98450A5
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
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
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