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Mercury Outboard Parts
Shop Mercury outboard motor parts by system, including cooling, fuel delivery, electrical, internal engine components, lower unit parts, and routine service items. Browse OEM and replacement Mercury marine parts to support maintenance, repair, and rebuild projects.
Shop 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
Common Mercury Outboard Model References
This category supports many popular Mercury outboards across a wide horsepower range. Always confirm your model and serial number for best fitment.
- Portable & Midrange: 2.5HP–60HP (2-stroke & FourStroke)
- Performance: Pro XS and EFI platforms (75HP–300HP)
- Direct Injection: Optimax models (75HP–250HP)
- Premium Offshore: Verado models (135HP–400HP)
- Commercial: SeaPro models (commonly 75HP–300HP)
Always confirm your exact horsepower, model year, and serial number to ensure proper part compatibility before ordering.
8M0142695
Helm to Pump Pressure Hose for Mercury Verado Steering Systems
Designed for Mercury Verado hydraulic power steering systems. The 8M0078213 Power Steering Hose is a 16-foot pressure-side hose that connects the helm to the power steering pump. It is a critical component in maintaining proper hydraulic steering performance.
Compatibility
This hose is used on Mercury Verado outboards equipped with hydraulic power steering systems. It connects the steering helm to the power steering pump and is designed for pressure-side operation.
Application Chart
| Brand | Engine Family | System | Hose Type | Length |
|---|---|---|---|---|
| Mercury | Verado | Power Steering System | Helm to Pump (Pressure Side) | 16 ft |
Always confirm hose routing, length, and compatibility with your specific steering system before ordering.
Part Numbers & Cross References
| Reference Type | Part Number |
|---|---|
| OEM Part | 8M0078213 |
What This Part Is Used For
This hose carries hydraulic fluid from the steering helm to the power steering pump. It is part of the pressure side of the steering system and plays a key role in delivering responsive and controlled steering.
Damaged or leaking hoses can lead to loss of steering performance or hydraulic pressure. Replacing worn hoses helps maintain safe and reliable steering operation.
Related Steering Components
For complete steering system service, this hose is commonly used alongside the following components:
- Mercury Verado Gen B Power Steering Pump 8M0134736P – Drives the hydraulic steering system and supplies pressure.
- Damper Hose Kit 897643A01 – Completes the steering hose system and helps regulate hydraulic pressure.
Frequently Asked Questions
What does this hose connect?
It connects the steering helm to the power steering pump on the pressure side of the system.
What length is this hose?
This hose is 16 feet long.
Is this a pressure or return hose?
This is the pressure-side hose.
When should this hose be replaced?
It should be replaced if there are signs of cracking, leaks, or reduced steering performance.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer or technician? We offer dealer pricing for qualified businesses.
Shipping Policy
- Free shipping on orders over $100 (continental U.S.)
- Ships via UPS, USPS, and FedEx
- 5:30 PM EST daily cutoff
- Typical delivery 1–5 business days
30-Day Return Policy
- Returns within 30 days
- Items must be unused and in original packaging
Contact Us
Phone: 941-721-3000
Searchable Part Numbers
Part Number: 8M0078213
Common Searches: Mercury Verado steering hose, helm to pump hose, power steering pressure hose, 16ft steering hose, Verado hydraulic hose
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