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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.
9738A7
9738A9
9738T9
9738A7
9738A9
9738T9
8475252
Fits Mercury 75-250 HP DFI Outboards
Compatible with select Mercury 75-250 HP DFI outboard engines using injector #840481 and #804528. The Pro Marine 20-3071B Fuel Injector O-Ring is a replacement injector seal designed to maintain a proper seal around the fuel injector. It is associated with Manufacturer Item 804529 and is commonly searched by that number when replacing worn injector seals during fuel system service.
Compatibility
This injector O-ring is used on many Mercury DFI / Optimax outboards from 75 HP up to 250 HP. It is associated with OEM reference number 804529 and commonly used with fuel injectors 840481 and 804528.
Application Chart
Always confirm compatibility using your engine model, serial number, injector number, or existing part number before ordering.
Part Numbers & Cross References
| Reference Type | Part Number |
|---|---|
| Pro Marine Part | 20-3071B |
| Manufacturer Item | 804529 |
| Cross Reference # | 804529 |
| Fits Injector # | 840481 |
| Fits Injector # | 804528 |
What This Part Is Used For
Fuel injector O-rings help seal the injector properly when installed in the fuel rail or intake system. If an injector is removed for cleaning, inspection, or replacement, installing a new O-ring helps ensure the system seals correctly when reassembled.
Over time these seals can flatten, harden, or become damaged due to heat and fuel exposure. Replacing them during injector service helps prevent sealing issues and keeps fuel system maintenance reliable.
Frequently Asked Questions
What engines does this O-ring fit?
This part is listed for Mercury 75-250 HP DFI outboards and fits injector numbers 840481 and 804528.
What OEM number is associated with this part?
The product page lists both Manufacturer Item 804529 and Cross Reference #804529.
When should I replace a fuel injector O-ring?
Injector O-rings are commonly replaced anytime injectors are removed for cleaning, inspection, or replacement.
Is this an OEM Mercury part?
This listing is an aftermarket replacement part from Pro Marine associated with Mercury reference number 804529.
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 qualifying orders over $100 (continental U.S.).
- Orders ship via UPS, USPS, or FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical ground delivery time is 15 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
Pro Marine Part: 20-3071B
Manufacturer Item: 804529
Cross Reference #: 804529
Fits Injector #: 840481, 804528
Common Search Terms: 20-3071B fuel injector o-ring, Mercury 804529, Mercury injector o-ring 804529, injector 840481 seal, injector 804528 o-ring
Pro Marine Aftermarket Mercury Verado L6 Engine Components
Mercury Verado L6 225-300 HP Cylinder Head Gasket - Pro Marine 24564P
The Pro Marine 24564P Cylinder Head Gasket is an aftermarket replacement for select Mercury Verado 225, 250, 275, and 300 HP Inline 6 (L6) 4-stroke outboard engines. This gasket seals the cylinder head to the engine block, helping maintain combustion compression while separating the engine's cooling water and lubrication passages.
Pro Marine 24564P replaces Mercury OEM cylinder head gasket numbers 8M0033476, 8M0024564, 880552007, 895374, 895374002, and 895374006. Mercury part number 8M0033476 is the current replacement for the earlier 8M0024564 gasket.
Designed for compatible Mercury Verado L6 applications, this replacement gasket is used during cylinder head repairs, head gasket replacement, and engine rebuilding. It provides an aftermarket alternative to the Genuine Mercury OEM gasket.
Genuine Mercury OEM Version Available: Prefer the original factory part? Pro Marine USA also stocks Genuine Mercury 24564 / OEM 8M0033476 .
Product Information
- Pro Marine Part Number: 24564P
- Brand: Pro Marine Aftermarket
- Product Type: Cylinder Head Gasket
- Primary Mercury OEM Reference: 8M0033476
- Previous Mercury OEM Reference: 8M0024564
- Additional Cross References: 880552007, 895374, 895374002, 895374006
- Engine Manufacturer: Mercury Marine
- Engine Family: Mercury Verado
- Engine Configuration: Inline 6 Cylinder (L6)
- Engine Type: 4-Stroke Outboard
- Engine Displacement: 2.6 Liter
- Horsepower Applications: 225 HP, 250 HP, 275 HP, 300 HP
- Application: Cylinder Head to Engine Block
- Condition: New
- Genuine Mercury OEM Alternative: Pro Marine Item 24564 - Mercury OEM 8M0033476
OEM and Cross Reference Numbers
Pro Marine 24564P is an aftermarket replacement for the following Mercury Verado L6 cylinder head gasket part numbers.
| Manufacturer | Part Number | Description |
|---|---|---|
| Pro Marine | 24564P | Aftermarket Cylinder Head Gasket |
| Mercury Marine | 8M0033476 | Current OEM Replacement |
| Mercury Marine | 8M0024564 | Previous OEM Number |
| Mercury Marine | 880552007 | Earlier OEM Cross Reference |
| Mercury Marine | 895374 | Earlier OEM Cross Reference |
| Mercury Marine | 895374002 | Earlier OEM Cross Reference |
| Mercury Marine | 895374006 | Earlier OEM Cross Reference |
Mercury OEM 8M0024564 has been superseded by 8M0033476. The replacement gasket may differ in appearance from earlier production versions. Confirm compatibility using the engine's serial number and OEM parts diagram.
What This Part Is Used For
The cylinder head gasket is installed between the cylinder head and engine block on compatible Mercury Verado Inline 6 outboard engines.
Its primary function is to create a sealing interface around the combustion chambers while keeping cooling water and engine oil passages separated.
A properly installed head gasket helps maintain cylinder compression and prevents unwanted fluid movement between the engine's internal passages.
Common Repair Applications
- Mercury Verado L6 cylinder head gasket replacement
- 225 HP Verado Inline 6 engine repairs
- 250 HP Verado Inline 6 engine repairs
- 275 HP Verado Inline 6 engine repairs
- 300 HP Verado Inline 6 engine repairs
- Cylinder head removal and reinstallation
- Repairs involving cooling water or compression leakage
- Compatible Mercury Verado powerhead rebuilding
Important Fitment Note
Pro Marine 24564P is intended for select Mercury Verado 225, 250, 275, and 300 HP Inline 6 (L6) 4-stroke outboards.
Mercury produced multiple Verado engine configurations, and gasket compatibility varies by engine family and serial number. Not all Verado engines use the same cylinder head gasket.
This gasket is for the compatible 2.6L Inline 6 Verado applications. It should not be assumed to fit Mercury Verado 4-cylinder engines, V6 engines, V8 engines, V10 engines, or other Verado configurations.
Always confirm your complete engine serial number and the required Mercury OEM gasket number before ordering.
Compatible Mercury Verado Applications
Pro Marine 24564P fits select Mercury Verado 225-300 HP Inline 6 4-stroke outboard engines within the listed serial number ranges.
| Engine Family | Horsepower | Configuration |
|---|---|---|
| Mercury Verado L6 | 225 HP | 2.6L Inline 6, 4-Stroke |
| Mercury Verado L6 | 250 HP | 2.6L Inline 6, 4-Stroke |
| Mercury Verado L6 | 275 HP | 2.6L Inline 6, 4-Stroke |
| Mercury Verado L6 | 300 HP | 2.6L Inline 6, 4-Stroke |
Compatible Mercury Verado Serial Number Ranges
The following serial number ranges are included in the supplied fitment information for this gasket.
| Serial Number From | Serial Number Through | Application |
|---|---|---|
| 1B517434 | 2B144122 | Verado L6 |
| 2B034840 | 2B144122 | Verado L6 |
| 1B830170 | 2B144122 | Verado L6 |
| 2B144123 | 2B577715 | Verado L6 |
| 2B144123 | 2B578935 | Verado L6 |
| 0T980000 | 1B226999 | Verado L6 |
| 1B227000 | 1B381711 | Verado L6 |
| 0P409357 | 0P464487 | Verado L6 |
| 0P520553 | 2B144122 | Verado L6 |
Understanding Mercury Verado Serial Number Fitment
Mercury Verado L6 outboards were produced in multiple horsepower configurations and production series. Some serial number ranges overlap because they represent different engine variants.
The ranges above are supplied catalog applications and should be checked against the exact engine horsepower and serial number. A matching serial range alone does not establish compatibility with every Verado model.
Genuine Mercury OEM Cylinder Head Gasket Also Available
Pro Marine USA stocks both aftermarket and Genuine Mercury OEM versions of this cylinder head gasket. Choose the option that best fits your repair requirements.
Genuine Mercury 8M0033476 Cylinder Head Gasket
Genuine Mercury Marine factory replacement cylinder head gasket for compatible Mercury Verado Inline 6 outboard engines.
Pro Marine Item: 24564
Mercury OEM: 8M0033476
Previous OEM: 8M0024564
Manufacturer: Mercury Marine
The Genuine Mercury OEM gasket and Pro Marine aftermarket gasket are separate product listings. Confirm your engine serial number before selecting either version.
Common Symptoms of a Failed Cylinder Head Gasket
A damaged cylinder head gasket may allow combustion gases, cooling water, or engine oil to leak between internal engine passages.
Possible symptoms include:
- Loss of compression in one or more cylinders
- Engine overheating
- Cooling water entering a combustion chamber
- Water contamination in engine oil
- Rough idle or engine misfires
- Reduced engine performance
- Difficulty starting
- Combustion gases entering the cooling system
- Visible head gasket damage during engine disassembly
These symptoms may also be caused by other engine problems. Perform appropriate compression, cooling system, and engine diagnostic testing before replacing the gasket.
Installation and Service Tips
Replacing a Mercury Verado L6 cylinder head gasket requires cylinder head removal and careful inspection of the engine's sealing surfaces. Follow the Mercury service manual for the exact engine serial range.
Recommended Installation Practices
- Verify the complete Mercury engine serial number.
- Confirm that the engine is a compatible 2.6L Inline 6 Verado.
- Confirm the required Mercury OEM gasket number.
- Allow the engine to cool before beginning disassembly.
- Follow the correct cylinder head removal procedure.
- Inspect the cylinder head and engine block sealing surfaces.
- Check for warpage, cracks, corrosion, and other damage.
- Remove old gasket material without damaging sealing surfaces.
- Keep debris out of cylinders, cooling passages, and oil passages.
- Install the new gasket in the correct orientation.
- Use the manufacturer's specified fastener tightening sequence.
- Follow the correct torque and tightening procedure.
- Replace cylinder head fasteners or additional seals when required by the service manual.
- Inspect the cooling system for conditions that may have caused the original gasket failure.
- Check engine operation and cooling performance after reassembly.
Important Cylinder Head Installation Warning
Mercury Verado cylinder head gasket replacement requires correct surface preparation and the proper cylinder head tightening procedure.
Do not install a new cylinder head gasket over warped, cracked, or improperly prepared sealing surfaces. Incorrect installation can result in compression loss, cooling water leakage, overheating, and engine damage.
Key Features and Benefits
- Mercury Verado L6 Application: Replacement head gasket for select 2.6L Inline 6 Verado outboards.
- 225-300 HP Fitment: Listed for compatible 225, 250, 275, and 300 HP models.
- Pro Marine Aftermarket Replacement: Alternative to Genuine Mercury OEM cylinder head gasket 8M0033476.
- Multiple OEM Cross References: Replaces the listed earlier Mercury head gasket part numbers.
- Combustion Chamber Sealing: Provides the gasket interface between the cylinder head and engine block.
- Engine Repair Component: Used during compatible Verado cylinder head repairs and rebuilding.
- OEM Alternative Available: Genuine Mercury 8M0033476 is also stocked by Pro Marine USA.
- Dealer Pricing Available: Qualified marine businesses can apply for wholesale pricing.
Frequently Asked Questions
What Mercury OEM number does Pro Marine 24564P replace?
Pro Marine 24564P replaces Mercury OEM 8M0033476 and earlier numbers 8M0024564, 880552007, 895374, 895374002, and 895374006.
Does this gasket fit Mercury Verado 225 HP engines?
Yes. It is listed for select Mercury Verado 225 HP Inline 6 4-stroke outboards within the specified serial number ranges.
Does this gasket fit Mercury Verado 250 HP engines?
Yes. It is listed for select Mercury Verado 250 HP Inline 6 4-stroke outboards within the specified serial number ranges.
Does this gasket fit Mercury Verado 275 HP engines?
Yes. It is listed for select Mercury Verado 275 HP Inline 6 4-stroke outboards within the specified serial number ranges.
Does this gasket fit Mercury Verado 300 HP engines?
Yes. It is listed for select Mercury Verado 300 HP Inline 6 4-stroke outboards within the specified serial number ranges.
Does this gasket fit all Mercury Verado outboards?
No. Mercury Verado engines were produced in multiple configurations. This gasket is intended for compatible 2.6L Inline 6 models, not every Verado engine.
Is Mercury 8M0024564 the same as 8M0033476?
Mercury OEM 8M0024564 has been superseded by 8M0033476. The newer part is the listed functional replacement for compatible applications.
Do you stock the Genuine Mercury OEM version?
Yes. Pro Marine USA also stocks Genuine Mercury 8M0033476 Cylinder Head Gasket under Pro Marine item number 24564.
Is Pro Marine 24564P a Genuine Mercury gasket?
No. Pro Marine 24564P is an aftermarket replacement. The Genuine Mercury OEM version is available separately.
What are common symptoms of a blown Verado head gasket?
Possible symptoms include loss of compression, overheating, rough running, cooling water intrusion, and engine oil contamination. Proper diagnostic testing is required to confirm the cause.
Should I replace the head gasket after removing the cylinder head?
A removed cylinder head gasket should be replaced with the correct new gasket during reassembly. Follow the Mercury service manual for all required installation procedures.
Dealer Discounts & Store Policies
Wholesale Marine Parts Pricing
Pro Marine USA supplies Genuine Mercury OEM and aftermarket marine engine parts, cylinder head gaskets, internal engine components, rebuild parts, and maintenance products to marine repair shops, dealerships, technicians, and retail customers.
Qualified marine businesses can apply for a Pro Marine dealer account to access wholesale pricing on eligible marine engine parts.
Shipping Information
- Free shipping on orders over $100 within the continental United States.
- In-stock orders received before 5:30 PM EST ship the same business day, Monday-Friday.
- Shipping options available through UPS, USPS, and FedEx.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Eligible returns are accepted within 30 days.
- Parts must be new, unused, and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before returning merchandise.
Need Help Confirming Mercury Verado Fitment?
If you are unsure whether Pro Marine 24564P is the correct cylinder head gasket for your Mercury Verado outboard, contact Pro Marine USA with your engine horsepower and complete serial number.
Contact Pro Marine USA or call 941-721-3000.
Searchable Part Numbers
24564P, 24564, 8M0033476, 8M0024564, 880552007, 895374, 895374002, 895374006, 27-8M0033476, 27-8M0024564, 27-895374006
Searchable Terms
Pro Marine 24564P, Mercury 8M0033476, Mercury 8M0024564, Mercury 895374, Mercury 895374002, Mercury 895374006, Mercury 880552007, Mercury Verado head gasket, Mercury Verado cylinder head gasket, Mercury Verado L6 head gasket, Mercury Verado Inline 6 head gasket, Mercury Verado 2.6L head gasket, Mercury Verado 225HP head gasket, Mercury Verado 250HP head gasket, Mercury Verado 275HP head gasket, Mercury Verado 300HP head gasket, Mercury 225 Verado cylinder head gasket, Mercury 250 Verado cylinder head gasket, Mercury 275 Verado cylinder head gasket, Mercury 300 Verado cylinder head gasket, Mercury Verado 225-300 HP gasket, Verado 6 cylinder head gasket, Verado L6 cylinder head to block gasket, Verado 4 stroke head gasket, Mercury outboard cylinder head gasket, Mercury Verado engine rebuild, Mercury Verado powerhead repair, Mercury Verado cylinder head repair, Mercury Verado blown head gasket, Mercury Verado compression loss, Mercury Verado cooling water intrusion, aftermarket Mercury Verado head gasket, Pro Marine Mercury engine parts, Genuine Mercury 8M0033476, Pro Marine 24564 OEM alternative
8M0024564
8M0033476
880552007
880552007
895374
895374
895374002
895374006
FI5537304
F700553
F700554
32780
32880
41670
41670006
416702
416703
416704
416705
803620
815504220
85111
882355
8667A42
8667T42
