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Genuine Mercury Marine OEM Engine Components
Genuine Mercury 8M0118179 Cylinder Head Gasket for 35-60 HP 4-Stroke Outboards
The Genuine Mercury 8M0118179 Cylinder Head Gasket is an original equipment manufacturer (OEM) replacement for select Mercury 35, 40, 50, and 60 HP 4-cylinder 4-stroke outboard engines. Compatible applications include specified carbureted and EFI engines, along with certain EFI Jet, SeaPro, APX, Formula 60, and 60R EFI Racing configurations.
This factory replacement gasket provides the sealing interface between the cylinder head and engine block. It helps maintain combustion chamber compression while separating the engine's cooling water and lubrication passages.
Mercury OEM part number 8M0118179 is listed as the replacement for earlier Mercury cylinder head gasket numbers 857081 and 8M0045278.
This genuine Mercury gasket is intended for compatible cylinder head repairs, gasket replacement, and powerhead service where a factory OEM replacement is preferred.
Pro Marine Aftermarket Alternative Available: We also stock Pro Marine 7081 Cylinder Head Gasket for the same listed applications.
Product Information
- Pro Marine Item Number: 857081
- Manufacturer: Mercury Marine
- Brand: Genuine Mercury OEM
- Current OEM Part Number: 8M0118179
- Previous OEM Numbers: 857081, 8M0045278
- Product Type: Cylinder Head Gasket
- Engine Manufacturer: Mercury Marine
- Engine Type: 4-Stroke Outboard
- Engine Configuration: Inline 4 Cylinder
- Primary Horsepower Applications: 40, 50, and 60 HP
- Additional Application: 35 HP EFI Jet
- Fuel Systems: Carbureted and EFI, depending on model
- Additional Engine Families: SeaPro, APX, Formula 60, 60R EFI Racing
- Application: Cylinder Head to Engine Block
- Condition: New
- Aftermarket Alternative: Pro Marine 7081
OEM and Cross Reference Numbers
Genuine Mercury 8M0118179 is the listed factory replacement for the following Mercury cylinder head gasket numbers.
| Manufacturer | Part Number | Description |
|---|---|---|
| Mercury Marine | 8M0118179 | Current Genuine Mercury OEM Replacement |
| Mercury Marine | 8M0045278 | Previous OEM Part Number |
| Mercury Marine | 857081 | Earlier OEM Part Number |
Mercury OEM Replacement Information
Mercury part numbers 857081 and 8M0045278 are listed under the current replacement number 8M0118179.
If your original engine parts diagram references an earlier gasket number, confirm the replacement against your complete Mercury engine serial number before ordering.
What This Part Is Used For
The Mercury cylinder head gasket seals the joint between the cylinder head and engine block on compatible 4-cylinder 4-stroke outboard engines.
This gasket helps maintain combustion pressure while preventing cooling water and engine oil from leaking between internal engine passages.
Genuine Mercury 8M0118179 is used during cylinder head removal, gasket replacement, and compatible engine repair procedures.
Common Repair Applications
- Mercury 40 HP 4-stroke cylinder head gasket replacement
- Mercury 50 HP carbureted and EFI cylinder head service
- Mercury 60 HP EFI cylinder head repairs
- Compatible Mercury EFI Jet outboard repairs
- Compatible Mercury SeaPro engine repairs
- Mercury 60 HP APX engine service
- Mercury Formula 60 engine repairs
- Mercury 60R EFI Racing cylinder head service
- Repairs involving compression or cooling water leakage
- Compatible Mercury 4-cylinder powerhead rebuilding
Important Fitment Note
Genuine Mercury 8M0118179 is listed for select Mercury 35-60 HP 4-cylinder 4-stroke engines. Not every Mercury engine within this horsepower range uses the same cylinder head gasket.
Mercury produced several engine configurations within these horsepower ranges, including different cylinder counts, carbureted and EFI fuel systems, and specialized Jet, SeaPro, APX, and Racing models.
The 35 HP application shown in the supplied Mercury catalog is specifically a 35 HP EFI Jet 4-cylinder. This does not establish fitment for every Mercury 35 HP outboard.
Verify your complete Mercury engine serial number and the required OEM cylinder head gasket number before ordering.
Compatible Mercury Outboard Applications
The following engine applications are organized from Mercury parts catalog information. Compatibility is determined by the engine configuration and serial number.
| Mercury Engine Family | Horsepower | Configuration |
|---|---|---|
| EFI Jet | 35 HP | 4 Cylinder |
| FourStroke | 40 HP | 4 Cylinder Carbureted / EFI |
| EFI Jet / SeaPro | 40 HP | 4 Cylinder EFI |
| FourStroke | 50 HP | 4 Cylinder Carbureted / EFI |
| FourStroke / SeaPro | 60 HP | 4 Cylinder EFI |
| APX | 60 HP | 1.0L EFI L4 |
| 60R EFI Racing | 60 HP | Racing Outboard |
| Formula 60 | 60 HP | Formula Racing Application |
EFI Jet, SeaPro, APX and Racing Serial Number Applications
| Engine Model | Serial Number Range | Mercury Catalog Reference |
|---|---|---|
| 35 HP EFI Jet 4 Cyl | 1C453840 and later | 90-8M0118807 |
| 40 HP EFI Jet 4 Cyl | 1C453840 and later | 90-8M0118807 |
| 40 HP EFI SeaPro 4 Cyl | 1C453840 and later | 90-8M0118807 |
| 60 HP EFI SeaPro 4 Cyl | 1C453840 and later | 90-8M0118807 |
| 60 HP 1.0L EFI L4 APX | 1C782688 and later | 90-8M0236731 |
| 60R HP EFI Racing | 1C615064 and later | 90-8M0169885 |
| Formula 60 | 1C104574 through 1C782687 | 90-8M0083070 |
Mercury 40-60 HP Carbureted 4-Cylinder Applications
| Horsepower | Serial Number Range | Market |
|---|---|---|
| 40 / 50 / 60 HP Carb | 0P094500 through 0P206999 | Belgium |
| 40 / 50 / 60 HP Carb | 0T178500 through 0T598999 | USA |
Mercury 40-60 HP EFI 4-Cylinder Serial Number Fitment
The following serial number ranges are listed for Mercury 40, 50, and 60 HP EFI 4-cylinder engines.
| Horsepower | Serial Number Range | Market | Catalog Reference |
|---|---|---|---|
| 40 / 50 / 60 HP EFI | 0P153500 through 0P400999 | Belgium | 90-88387502 |
| 40 / 50 / 60 HP EFI | 0T409000 through 1B355222 | USA | 90-88387502 |
| 40 / 50 / 60 HP EFI | 1C000001 through 1C050251 | USA | 90-883875003 |
| 40 / 50 / 60 HP EFI | 0P401000 through 0P515896 | Belgium | 90-883875003 |
| 40 / 50 / 60 HP EFI | 1C050252 through 1C453839 | USA | 90-883875008 |
| 40 / 50 / 60 HP EFI | 0P515897 through 0P580772 | Belgium | 90-883875008 |
Later-Production Mercury EFI Applications
| Engine Model | Serial Number | Catalog Reference |
|---|---|---|
| 40 HP EFI 4 Cylinder | 1C453840 and later | 90-8M0118807 |
| 50 HP EFI 4 Cylinder | 1C453840 and later | 90-8M0118807 |
| 60 HP EFI 4 Cylinder | 1C453840 and later | 90-8M0118807 |
Understanding Mercury Catalog Fitment
Mercury parts catalogs may list this gasket in both cylinder head diagrams and powerhead gasket set component diagrams. These references identify applicable engine configurations and do not mean that this individual gasket includes the complete powerhead gasket set.
Use the engine's complete serial number and the appropriate Mercury parts diagram to confirm the required cylinder head gasket.
Pro Marine Aftermarket Cylinder Head Gasket Available
Looking for an aftermarket alternative to the Genuine Mercury factory gasket? Pro Marine USA also stocks the Pro Marine 7081 Cylinder Head Gasket for the same listed Mercury applications.
Pro Marine 7081 - Aftermarket Cylinder Head Gasket
Pro Marine aftermarket replacement cylinder head gasket for compatible Mercury 35-60 HP 4-cylinder 4-stroke outboard engines.
Pro Marine Part: 7081
OEM Cross References: 857081, 8M0045278, 8M0118179
Brand: Pro Marine Aftermarket
Common Symptoms of a Failed Cylinder Head Gasket
A failed cylinder head gasket can allow combustion gases, engine oil, or cooling water to leak between internal engine passages.
Possible symptoms include:
- Loss of compression in one or more cylinders
- Engine overheating
- Cooling water entering the 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 cylinder head gasket
These symptoms may have multiple causes. Perform appropriate engine diagnostic testing before determining that the cylinder head gasket requires replacement.
Installation and Service Tips
Replacing a Mercury 4-cylinder cylinder head gasket requires cylinder head removal and inspection of the engine's sealing surfaces.
Follow the Mercury service manual for your exact engine serial number and configuration.
Recommended Installation Practices
- Confirm the complete Mercury engine serial number.
- Verify that the engine uses OEM gasket 8M0118179 or an applicable earlier number.
- 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.
Important Cylinder Head Installation Warning
Correct cylinder head gasket installation requires proper surface preparation, cylinder head inspection, and the specified Mercury 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
- Genuine Mercury OEM: Factory replacement cylinder head gasket for compatible Mercury 4-stroke outboards.
- Mercury 4-Cylinder Compatibility: Listed for select 35-60 HP engine configurations.
- Carbureted and EFI Applications: Includes specified Mercury 40, 50, and 60 HP 4-cylinder engine families.
- Specialized Mercury Models: Catalog references include EFI Jet, SeaPro, APX, Formula 60, and 60R EFI Racing.
- OEM Part Number 8M0118179: Listed replacement for earlier Mercury 857081 and 8M0045278 numbers.
- Factory Replacement Component: Intended for compatible cylinder head service and repairs.
- Aftermarket Alternative Available: Pro Marine 7081 is stocked separately.
- Dealer Pricing Available: Qualified marine businesses can apply for wholesale pricing.
Frequently Asked Questions
Is Mercury 8M0118179 a Genuine OEM cylinder head gasket?
Yes. Mercury 8M0118179 is a Genuine Mercury Marine OEM cylinder head gasket for compatible 4-cylinder 4-stroke outboards.
Does Mercury 8M0118179 replace 857081?
Yes. Mercury 8M0118179 is the listed replacement for earlier OEM number 857081.
Does Mercury 8M0118179 replace 8M0045278?
Yes. Mercury 8M0045278 is also listed as a previous OEM number for this cylinder head gasket.
Does this head gasket fit Mercury 40 HP 4-stroke engines?
Yes. This gasket is listed for select Mercury 40 HP carbureted and EFI 4-cylinder 4-stroke engines. Confirm the serial number before ordering.
Does this gasket fit Mercury 50 HP EFI outboards?
Yes. Compatible applications include specified Mercury 50 HP EFI 4-cylinder outboards.
Does this gasket fit Mercury 60 HP 4-stroke engines?
Yes. It is listed for select Mercury 60 HP EFI 4-cylinder engines, 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 mean the gasket fits every Mercury 35 HP engine.
Is this gasket used on Mercury Formula 60 engines?
Formula 60 appears in the supplied Mercury catalog for serial numbers 1C104574 through 1C782687. Confirm the required gasket using the appropriate parts diagram.
Does this gasket fit Mercury 60R EFI Racing engines?
The supplied catalog includes Mercury 60R EFI Racing models beginning at serial 1C615064. Verify the engine configuration before ordering.
Is there a Pro Marine aftermarket version available?
Yes. Pro Marine USA also offers Pro Marine 7081 as an aftermarket replacement for the same listed applications.
How do I confirm the correct head gasket for my Mercury outboard?
Locate your complete Mercury engine serial number and compare it with the applicable Mercury parts diagram. Confirm that the diagram identifies 8M0118179 or one of its listed earlier OEM numbers.
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 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 Fitment?
If you are unsure whether Genuine Mercury 8M0118179 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
857081, 8M0118179, 8M0045278, 7081
Searchable Terms
Genuine Mercury 857081, Genuine Mercury 8M0118179, Mercury 8M0045278, Mercury OEM cylinder head gasket, Mercury factory head gasket, Mercury 4 stroke head gasket, Mercury 4 cylinder head gasket, Mercury 35 HP EFI Jet head gasket, Mercury 40 HP head gasket, Mercury 50 HP head gasket, Mercury 60 HP head gasket, Mercury 40 EFI cylinder head gasket, Mercury 50 EFI cylinder head gasket, Mercury 60 EFI cylinder head gasket, Mercury 40 SeaPro head gasket, Mercury 60 SeaPro head gasket, Mercury 40 HP EFI Jet gasket, Mercury 60 HP APX head gasket, Mercury 60R EFI Racing head gasket, Mercury Formula 60 head gasket, Mercury 40 50 60 HP head gasket, Mercury outboard cylinder head gasket, Mercury FourStroke head gasket, Mercury 4 cylinder powerhead gasket, Mercury outboard engine rebuild, Mercury cylinder head repair, Mercury head gasket replacement, Mercury blown head gasket, Mercury low compression, Mercury cooling water intrusion, Mercury OEM engine parts, original Mercury head gasket, factory Mercury replacement gasket, Pro Marine 857081, Pro Marine 7081 aftermarket alternative
8M0118179
857081
18785T
187851
187853
35850
9-63851
67066
79583
795831
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.
| Manufacturer | Part Number | Description |
|---|---|---|
| Pro Marine | 7081 | Aftermarket Cylinder Head Gasket |
| Mercury Marine | 8M0118179 | Current OEM Replacement |
| Mercury Marine | 8M0045278 | Previous OEM Part Number |
| Mercury Marine | 857081 | Earlier OEM Part Number |
Mercury OEM Supersession Information
Mercury OEM 857081 and 8M0045278 have been superseded by 8M0118179.
The current replacement may differ in appearance from an earlier production gasket. Confirm compatibility using the engine serial number and Mercury parts diagram.
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.
| Mercury Engine Family | Horsepower | Configuration |
|---|---|---|
| EFI Jet | 35 HP | 4 Cylinder |
| EFI Jet / SeaPro | 40 HP | 4 Cylinder EFI |
| FourStroke | 40 HP | 4 Cylinder Carbureted / EFI |
| FourStroke | 50 HP | 4 Cylinder Carbureted / EFI |
| FourStroke / SeaPro | 60 HP | 4 Cylinder EFI |
| APX | 60 HP | 1.0L EFI L4 |
| 60R EFI Racing | 60 HP | Racing Outboard |
| Formula 60 | 60 HP | Formula Racing Application |
EFI Jet, SeaPro, APX and Racing Applications
| Engine Model | Serial Number Range | Catalog Reference |
|---|---|---|
| 35 HP EFI Jet 4 Cyl | 1C453840 and later | 90-8M0118807 |
| 40 HP EFI Jet 4 Cyl | 1C453840 and later | 90-8M0118807 |
| 40 HP EFI SeaPro 4 Cyl | 1C453840 and later | 90-8M0118807 |
| 60 HP EFI SeaPro 4 Cyl | 1C453840 and later | 90-8M0118807 |
| 60 HP 1.0L EFI L4 APX | 1C782688 and later | 90-8M0236731 |
| 60R HP EFI Racing | 1C615064 and later | 90-8M0169885 |
| Formula 60 | 1C104574 through 1C782687 | 90-8M0083070 |
Catalog references identify Mercury parts diagrams and are not cylinder head gasket part numbers.
Mercury 40-60 HP Carbureted 4-Cylinder Applications
| Horsepower | Serial Number Range | Market |
|---|---|---|
| 40 / 50 / 60 HP Carb | 0P094500 through 0P206999 | Belgium |
| 40 / 50 / 60 HP Carb | 0T178500 through 0T598999 | USA |
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.
| Horsepower | Serial Number Range | Market | Catalog Reference |
|---|---|---|---|
| 40 / 50 / 60 HP EFI | 0P153500 through 0P400999 | Belgium | 90-88387502 |
| 40 / 50 / 60 HP EFI | 0T409000 through 1B355222 | USA | 90-88387502 |
| 40 / 50 / 60 HP EFI | 1C000001 through 1C050251 | USA | 90-883875003 |
| 40 / 50 / 60 HP EFI | 0P401000 through 0P515896 | Belgium | 90-883875003 |
| 40 / 50 / 60 HP EFI | 1C050252 through 1C453839 | USA | 90-883875008 |
| 40 / 50 / 60 HP EFI | 0P515897 through 0P580772 | Belgium | 90-883875008 |
Additional USA EFI Applications
The supplied Mercury catalog also lists the following later-production EFI 4-cylinder applications.
| Engine Model | Serial Number | Catalog Reference |
|---|---|---|
| 40 HP EFI 4 Cylinder | 1C453840 and later | 90-8M0118807 |
| 50 HP EFI 4 Cylinder | 1C453840 and later | 90-8M0118807 |
| 60 HP EFI 4 Cylinder | 1C453840 and later | 90-8M0118807 |
Understanding Mercury Serial Number Fitment
Mercury produced several 40-60 HP 4-cylinder engine configurations, including carbureted, EFI, SeaPro, Jet, and racing applications.
Serial number ranges shown above represent catalog applications supplied for this gasket. Verify the exact engine configuration and OEM part number before ordering.
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
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
These symptoms may have other causes. Perform appropriate compression, cooling system, and engine diagnostic testing before replacing the 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.
Important Installation Warning
Proper cylinder head gasket installation requires correct surface preparation, inspection, and the specified Mercury 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
- 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.
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
Pro Marine 7081, Mercury 857081, Mercury 8M0045278, Mercury 8M0118179, Mercury cylinder head gasket, Mercury 4 stroke head gasket, Mercury 4 cylinder head gasket, Mercury 35HP EFI Jet head gasket, Mercury 40HP head gasket, Mercury 50HP head gasket, Mercury 60HP head gasket, Mercury 40 EFI cylinder head gasket, Mercury 50 EFI cylinder head gasket, Mercury 60 EFI cylinder head gasket, Mercury 40 SeaPro head gasket, Mercury 60 SeaPro head gasket, Mercury 40HP EFI Jet gasket, Mercury 60 HP APX head gasket, Mercury 60R EFI Racing head gasket, Mercury Formula 60 head gasket, Mercury 40 50 60 HP head gasket, Mercury outboard cylinder head gasket, Mercury FourStroke head gasket, Mercury 4 cylinder powerhead gasket, Mercury outboard engine rebuild, Mercury cylinder head repair, Mercury head gasket replacement, Mercury blown head gasket, Mercury low compression, Mercury cooling water intrusion, aftermarket Mercury head gasket, Pro Marine Mercury engine parts, Genuine Mercury 857081 alternative, Genuine Mercury 8M0118179 alternative
8M0118179
857081
859772
8597721