Pro Marine 7081 Head Gasket Mercury 35-60 HP 4 Stroke

Pro Marine Aftermarket Mercury Outboard Engine Components

Mercury 35-60 HP 4-Stroke Cylinder Head Gasket - Pro Marine 7081

The Pro Marine 7081 Cylinder Head Gasket is an aftermarket replacement for select Mercury 35, 40, 50, and 60 HP 4-cylinder 4-stroke outboard engines. Compatible applications include standard carbureted and EFI models, along with certain EFI Jet, SeaPro, APX, Formula 60, and 60R EFI Racing configurations.

This replacement cylinder head gasket provides the sealing interface between the engine block and cylinder head. It helps maintain combustion chamber compression while separating cooling water and lubrication passages.

Pro Marine 7081 cross references Mercury OEM part numbers 857081, 8M0045278, and 8M0118179. Mercury 8M0118179 is the current listed OEM replacement for the earlier gasket numbers.

This gasket is used during cylinder head repairs, head gasket replacement, and compatible Mercury 4-cylinder powerhead rebuilding.

Genuine Mercury OEM Version Available: Pro Marine USA also stocks Genuine Mercury Cylinder Head Gasket - Item 857081 .

Product Information

• Pro Marine Part Number: 7081
• Brand: Pro Marine Aftermarket
• Product Type: Cylinder Head Gasket
• Primary OEM Reference: Mercury 8M0118179
• Additional OEM References: 8M0045278, 857081
• Engine Manufacturer: Mercury Marine
• Engine Type: 4-Stroke Outboard
• Engine Configuration: Inline 4 Cylinder
• Standard Horsepower Applications: 40, 50, and 60 HP
• Additional Listed Applications: 35 HP EFI Jet, 40 HP EFI Jet, 60 HP APX, 60R EFI Racing, Formula 60
• Other Configurations: Carbureted, EFI, and SeaPro
• Application: Cylinder Head to Engine Block
• Condition: New
• Genuine Mercury OEM Alternative: Mercury 857081 / 8M0118179

OEM and Cross Reference Numbers

Pro Marine 7081 is an aftermarket replacement for the following Mercury Marine cylinder head gasket numbers.

What This Part Is Used For

The cylinder head gasket seals the joint between the cylinder head and engine block on compatible Mercury 4-cylinder 4-stroke outboard engines.

Its primary functions include maintaining combustion pressure, separating cooling water from engine oil passages, and preventing leakage between adjacent engine passages.

Common Repair Applications

• Mercury 40 HP 4-stroke cylinder head gasket replacement
• Mercury 50 HP 4-stroke cylinder head repairs
• Mercury 60 HP EFI cylinder head repairs
• Compatible Mercury SeaPro engine repairs
• Compatible Mercury EFI Jet engine repairs
• Mercury 60R EFI Racing and Formula 60 engine service
• Cylinder head removal and reinstallation
• Repairs involving compression or cooling water leakage
• Compatible Mercury 4-cylinder powerhead rebuilding

Important Fitment Note

Pro Marine 7081 is intended for select Mercury 4-cylinder 4-stroke engines. Not every Mercury 35-60 HP outboard uses this cylinder head gasket.

Mercury manufactured multiple engine configurations within these horsepower ranges, including different cylinder counts, fuel systems, and production series.

The 35 HP application shown in the supplied catalog is specifically a 35 HP EFI Jet 4-cylinder. This does not establish fitment for every Mercury 35 HP outboard.

Always verify the engine's complete serial number and required Mercury OEM gasket number before ordering.

Compatible Mercury Outboard Applications

The following applications are organized from the supplied Mercury parts catalog screenshots. Engine serial numbers determine compatibility.

EFI Jet, SeaPro, APX and Racing Applications

Catalog references identify Mercury parts diagrams and are not cylinder head gasket part numbers.

Mercury 40-60 HP Carbureted 4-Cylinder Applications

Mercury 40-60 HP EFI 4-Cylinder Serial Number Fitment

The following serial ranges are shown for Mercury 40, 50, and 60 HP EFI 4-cylinder engines.

Additional USA EFI Applications

The supplied Mercury catalog also lists the following later-production EFI 4-cylinder applications.

Genuine Mercury OEM Cylinder Head Gasket Also Available

Pro Marine USA stocks both the Pro Marine aftermarket cylinder head gasket and the Genuine Mercury OEM version. Customers can select the replacement that best suits their repair requirements.

Genuine Mercury Cylinder Head Gasket - Item 857081

Genuine Mercury Marine factory replacement cylinder head gasket for compatible 4-cylinder Mercury 4-stroke outboards.

Pro Marine Item: 857081
Current Mercury OEM: 8M0118179
Previous OEM Numbers: 8M0045278, 857081
Manufacturer: Mercury Marine

View Genuine Mercury OEM Gasket

Genuine Mercury OEM and Pro Marine aftermarket gaskets are separate product listings. Confirm engine serial number compatibility before ordering.

Common Symptoms of a Failed Cylinder Head Gasket

A damaged cylinder head gasket can allow combustion gases, cooling water, or engine oil to leak between internal engine passages.

Possible symptoms include:

• Low 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 damage to the original head gasket

Installation and Service Tips

Cylinder head gasket replacement requires removal of the cylinder head and careful inspection of the engine's sealing surfaces. Follow the Mercury service manual for the exact engine serial number.

Recommended Installation Practices

• Verify the complete Mercury engine serial number.
• Confirm the engine uses the 4-cylinder gasket identified by the OEM cross references.
• Allow the engine to cool before beginning disassembly.
• Follow Mercury's specified 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, oil passages, and cooling passages.
• Install the new gasket in the correct orientation.
• Follow the manufacturer's specified tightening sequence.
• Use the correct cylinder head fastener torque procedure.
• Replace additional fasteners or seals when required by the service manual.
• Inspect the cooling system for conditions that caused the original gasket failure.
• Check engine operation and cooling performance after reassembly.

Key Features and Benefits

• Pro Marine Aftermarket Replacement: Alternative to the Genuine Mercury OEM cylinder head gasket.
• Mercury 4-Cylinder Applications: Listed for compatible 35-60 HP 4-stroke outboard configurations.
• Carbureted and EFI Fitment: Includes select 40, 50, and 60 HP Mercury engine families.
• Specialized Engine Applications: Catalog references include EFI Jet, SeaPro, APX, Formula 60, and 60R EFI Racing.
• Multiple OEM Cross References: Replaces Mercury 857081, 8M0045278, and 8M0118179.
• Engine Repair Component: Used during compatible cylinder head repairs and rebuilding.
• OEM Alternative Available: Genuine Mercury factory replacement is stocked separately.
• Dealer Pricing Available: Qualified marine businesses can apply for wholesale pricing.

Frequently Asked Questions

What Mercury OEM part numbers does Pro Marine 7081 replace?

Pro Marine 7081 cross references Mercury OEM 857081, 8M0045278, and 8M0118179.

Does this head gasket fit Mercury 40 HP 4-stroke outboards?

Yes. It is listed for select Mercury 40 HP 4-cylinder carbureted and EFI outboards, including certain EFI Jet and SeaPro applications. Verify the engine serial number.

Does Pro Marine 7081 fit Mercury 50 HP EFI engines?

Yes. Compatible applications include select Mercury 50 HP EFI 4-cylinder 4-stroke engines. The engine serial number must match an applicable catalog listing.

Does this gasket fit Mercury 60 HP 4-stroke engines?

Yes. It is listed for select Mercury 60 HP EFI 4-cylinder outboards, including certain SeaPro and specialized racing applications.

Does this gasket fit Mercury 35 HP outboards?

The supplied Mercury catalog lists a 35 HP EFI Jet 4-cylinder application. This does not establish fitment for every Mercury 35 HP engine.

Does this gasket fit Mercury Formula 60 engines?

Formula 60 appears in the supplied Mercury catalog with serial numbers 1C104574 through 1C782687. Confirm the required OEM gasket against the engine parts diagram.

Does this gasket fit Mercury 60R EFI Racing outboards?

The supplied catalog includes Mercury 60R EFI Racing models beginning at serial 1C615064. Confirm compatibility before ordering.

Does Mercury 8M0118179 replace 857081?

Yes. Mercury 8M0118179 is the current listed replacement for earlier numbers 857081 and 8M0045278.

Is Pro Marine 7081 a Genuine Mercury gasket?

No. Pro Marine 7081 is an aftermarket replacement. The Genuine Mercury OEM version is sold separately.

Do you stock the Genuine Mercury OEM version?

Yes. Pro Marine USA also stocks Genuine Mercury Cylinder Head Gasket - Item 857081 .

What are common symptoms of a failed Mercury head gasket?

Possible symptoms include low compression, overheating, cooling water intrusion, engine oil contamination, rough running, and reduced engine performance. Proper diagnosis is required to confirm gasket failure.

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.

Apply for Dealer Pricing

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 Fitment?

If you are unsure whether Pro Marine 7081 is the correct cylinder head gasket for your Mercury 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

7081, 857081, 8M0045278, 8M0118179, 27-857081, 27-8M0045278, 27-8M0118179

Searchable Terms

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