803510 MERCURY Rocker Head Valve Cover Outboard Mariner

Review MERCURY 4hp 5hp 6hp Rocker Head Valve Cover Outboard Stroke for MARINER

The Mercury 803510 Mariner Valve Cover is an essential component for outboard engines, designed to house and protect the rocker arm valves in Mercury 4hp, 5hp, and 6hp Mariner outboard engines. This high-quality valve cover is engineered to provide superior engine performance and reliability.

The valve cover is meticulously crafted from durable cast aluminum, which ensures strength and longevity. Its sleek, modern design not only enhances the visual appeal of the engine but also provides excellent cooling capabilities. The cooling system is designed to circulate engine coolant around the valves and rocker arms, maintaining optimal operating temperatures for enhanced performance and longevity.

The Mercury 803510 Mariner Valve Cover is equipped with a vented design, which helps prevent the accumulation of harmful gases in the crankcase. This feature promotes a healthy engine environment, reducing the risk of damage from excessive pressure buildup. The valve cover also includes a breather system, which allows for the proper evacuation of crankcase gases, ensuring a consistent fuel-air mixture and improved combustion efficiency.

This valve cover is an OEM (Original Equipment Manufacturer) replacement part, ensuring a perfect fit and seamless integration with your Mercury Mariner outboard engine. It is easy to install, requiring no modifications or additional tools, making it an ideal choice for DIY enthusiasts or professional mechanics.

In summary, the Mercury 803510 Mariner 4hp, 5hp, 6hp Rocker Head Valve Cover is a high-performance and reliable component designed to protect and enhance the functionality of your Mercury Mariner outboard engine. Its durable cast aluminum construction, advanced cooling system, and vented design provide excellent engine protection and cooling capabilities, ensuring optimal performance and longevity.

The Mercury Mariner 4hp, 5hp, and 6hp outboard engines are known for their reliability and fuel efficiency. One of the important parts of these engines is the rocker head valve cover. Here are some pros and cons of buying a new Mercury 803510 Mariner 4hp, 5hp, or 6hp rocker head valve cover.

1. OEM Part: This valve cover is an original equipment manufacturer (OEM) part, meaning it is designed and manufactured by Mercury to fit and function optimally with their engines.

2. Improved Sealing: The new valve cover can provide better sealing than an old or worn-out one, which can help prevent oil leaks and reduce the risk of engine damage.

3. Aesthetic Appeal: A new valve cover can give your engine a fresh look and make it more visually appealing.

4. Warranty Coverage: A new Mercury valve cover comes with a warranty from the manufacturer, giving you peace of mind and protection against potential defects.

1. Cost: Replacing a valve cover can be an expensive repair, especially for outboard engines where labor costs can be high.

2. Availability: Depending on the specific model and availability, it may take some time to source and receive a new valve cover.

The decision to buy a new Mercury 803510 Mariner 4hp, 5hp, or 6hp rocker head valve cover depends on the current condition of your engine and your personal priorities. If you are experiencing oil leaks, have an old valve cover, or simply want the peace of mind that comes with a new OEM part, then buying a new valve cover may be the best option for you. However, if cost is a concern, you may want to consider other options such as rebuilding or repairing the existing valve cover. Ultimately, it is important to weigh the pros and cons and consult with a qualified mechanic or engine specialist for advice tailored to your specific situation.

If you are experiencing oil leaks, have an older engine, or want the peace of mind that comes with a new OEM part, then it is recommended that you consider purchasing a new Mercury 803510 Mariner 4hp, 5hp, or 6hp rocker head valve cover from a reputable Mercury dealer or supplier. However, if cost is a concern, it may be worth exploring other options such as rebuilding or repairing the existing valve cover before making a decision. It is always a good idea to consult with a qualified mechanic or engine specialist for advice before making any major repairs or purchases for your outboard engine.

Details:

The equivalent towheads part number is: 3h6-01021-0, 3h6b010210 3h6-01021-0.

specifications watercraftimp:

• for models: Mariner
• brand: Mercury
• mpn: 803510
• sub-type: Engine Fittings
• type: Engine Parts
• unit type: Unit

seller watercraftimp:

• city: gloucester, massachusetts
• # reviews: 801
• rating: 100.0%

general watercraftimp:

• category: Watercraft Parts > Engines > Impellers Components

shipping watercraftimp:

• carrier: usps
• class: standard
• transit: 4-10 days
• service: usps ground advantage
• type: fixed

payments watercraftimp:

• other
• credit card: discover
• money order
• wallet: apple-pay

returns watercraftimp:

• policy: no returns

offer watercraftimp:

• options: ship-to-home
• prices: $14.00–$21.39
• item condition: Used
• availability: in stock
• started: april 5, 2026
• in stock #: 2
• sold #: 6
• best offers: true