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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.
516-44
840484
Genuine OEM Mercury Verado Steering Cylinder Seal Kit
Mercury Hydraulic Steering Cylinder Reseal Kit - 8M0045604
This genuine OEM Mercury steering cylinder seal kit is used to reseal select Mercury Verado hydraulic steering cylinder assemblies.
The kit includes the seals and O-rings commonly required during steering cylinder repair and hydraulic steering system service.
Compatible Applications
| Engine Range | Engine Type | System | Application Notes |
|---|---|---|---|
| Mercury Verado 135-400 HP | FourStroke | Hydraulic Steering | Used in compatible Mercury Verado steering cylinder assemblies |
| Mercury L6 Verado Models | Supercharged FourStroke | Hydraulic Steering | Used in compatible integrated steering systems |
| Mercury V8 and V10 Verado Models | FourStroke | Hydraulic Steering | Used in compatible Verado steering cylinder assemblies |
This genuine Mercury steering cylinder reseal kit fits select Mercury Verado hydraulic steering cylinder assemblies. Mercury OEM part number 8M0045604 supersedes older Mercury seal kit number 896173A01.
Always verify your Mercury engine model, serial number, and steering cylinder assembly before ordering.
OEM Part Numbers and Supersessions
| Brand / Type | Part Number |
|---|---|
| Genuine Mercury OEM | 8M0045604 |
| Supersedes Mercury OEM | 896173A01 |
Watch: Mercury Verado Steering Cylinder Repair and Reseal
See how a Mercury Verado steering cylinder is repaired.
Watch Pro Marine USA demonstrate steering cylinder disassembly, cleaning, inspection, seal replacement, and reassembly. The tutorial also shows an example of contaminated hydraulic steering fluid.
Watch Repair VideoThis video demonstrates the general repair process. Always verify steering cylinder compatibility and follow the applicable Mercury service procedures.
Related Steering Cylinder Seal
Need the steering cylinder attachment seal used when reinstalling the steering cylinder to the engine? See the Pro Marine 880667 Steering Cylinder Seal .
Aftermarket Alternative Available
Looking for an aftermarket replacement option? Pro Marine offers part number 2700P, an aftermarket steering cylinder seal kit for compatible Mercury Verado hydraulic steering cylinder assemblies.
View Pro Marine 2700P Steering Cylinder Seal Kit
What This Steering Cylinder Seal Kit is Used For
This genuine Mercury steering cylinder seal kit is used to reseal compatible Verado hydraulic steering cylinder assemblies.
The kit includes multiple hydraulic seals and O-rings commonly replaced during steering cylinder repair and hydraulic steering system service.
Worn or damaged steering cylinder seals may allow hydraulic fluid leakage, steering pressure loss, or reduced steering performance.
Replacing steering cylinder seals during service helps maintain proper hydraulic steering operation and reduce fluid leakage.
Common Symptoms and Replacement Reasons
- Hydraulic fluid leaking from the steering cylinder
- Visible damage or deterioration of cylinder seals
- Hydraulic steering fluid loss
- Reduced steering performance associated with seal leakage
- Steering cylinder disassembly for inspection or service
- Replacement of worn seals during cylinder rebuilding
Steering problems may also be caused by the power steering pump, hydraulic hoses, helm, fluid contamination, or other components. Proper diagnosis is recommended before replacing seals.
Key Features and Benefits
- Genuine OEM Mercury steering cylinder seal kit
- Current Mercury OEM part number 8M0045604
- Supersedes Mercury OEM seal kit 896173A01
- Fits select Mercury Verado hydraulic steering systems
- Includes seals and O-rings commonly needed for cylinder reseal service
- Helps maintain hydraulic steering pressure
- Helps reduce hydraulic fluid leakage
- Genuine Mercury replacement components
Steering Cylinder Seal Kit Details
- Brand: Genuine Mercury OEM
- Part Type: Steering Cylinder Seal Kit
- Current OEM Part Number: 8M0045604
- Supersedes OEM: 896173A01
- Application: Mercury Verado Steering Cylinder Assemblies
- System: Hydraulic Steering System
- Use: Steering cylinder reseal service
- Quantity Sold: Kit
Installation and Repair Tips
- Verify steering cylinder compatibility before beginning repairs.
- Follow the applicable Mercury service manual for disassembly and reassembly.
- Inspect internal cylinder surfaces for scoring, corrosion, and damage.
- Keep hydraulic components clean to prevent introducing contamination.
- Use the hydraulic steering fluid specified for your Mercury steering system.
- Follow the manufacturer's bleeding and testing procedures after repair.
Important: Hydraulic steering is a safety-critical system. Repairs should be performed by qualified personnel using appropriate Mercury service procedures.
Frequently Asked Questions
What does Mercury 8M0045604 fit?
This seal kit fits select Mercury Verado hydraulic steering cylinder
assemblies using compatible steering system components.
Does Mercury 8M0045604 replace 896173A01?
Yes. Mercury OEM part number 8M0045604 supersedes
older seal kit number 896173A01.
What is included in this kit?
The kit includes the seals and O-rings commonly required
to reseal compatible Verado steering cylinders.
Can damaged steering cylinder seals cause fluid leaks?
Yes. Worn or damaged seals may allow hydraulic fluid
leakage and reduced steering performance.
Will this kit fix every Mercury Verado steering problem?
No. Steering problems may also involve the power steering pump,
helm, hydraulic hoses, or other system components.
Proper diagnosis is recommended.
Is there a video showing how to rebuild a Mercury Verado steering cylinder?
Yes. Pro Marine USA provides a steering cylinder repair tutorial
demonstrating disassembly, cleaning, inspection, seal replacement,
and reassembly. Click the video preview above to watch.
Do I need the additional steering cylinder attachment seal?
Depending on the repair, the steering cylinder attachment seal
may also need replacement. See Pro Marine part number 880667.
Is there an aftermarket alternative?
Yes. Pro Marine 2700P is an aftermarket replacement
seal kit for compatible Mercury Verado steering cylinders.
Should I verify fitment before ordering?
Yes. Mercury used multiple steering cylinder configurations.
Verify your engine serial number and steering cylinder
assembly before purchasing.
Dealer Discounts and 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 in the 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.
- Hydraulic steering components should be installed only after confirming correct fitment.
- 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
8M0045604, 896173A01
Searchable Terms
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8M0045604
896173A01
139372
139374
139376
18-0320
32220
509247
9-60061
516-52
880122
841220
858581
93210-19MJ1
127751
127752
127753
127754
30970
508638
78298
21330
30271
508510
8M0214918
9-76562
99123