Sierra 18-7409 O-Ring @5 1=Pkg 5 911871
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Sierra 18-7409 O-Ring @5 1=Pkg 5 911871 Product Description
Keep your marine engine running smoothly with the Sierra 18-7409 O-Ring, a precision-engineered replacement designed for reliable sealing in demanding boating conditions. Sold in a convenient pack of five, this O-ring directly replaces the OEM Mercury 911871, ensuring a perfect fit without the hassle of custom modifications. Boat owners trust Sierra parts for their consistent performance, especially in fuel systems where leaks can lead to performance issues or safety concerns.
Why Choose Sierra 18-7409 O-Rings?
Unlike generic seals that degrade quickly under marine stress, these O-rings are crafted from high-quality, fuel-resistant rubber compounds. They stand up to ethanol-blended fuels, saltwater exposure, and constant vibration—common culprits behind seal failures in outboard motors. Each O-ring delivers a tight, leak-proof seal, helping prevent air intrusion or fuel loss that could cause hard starts, rough idling, or reduced power output.
- Pack of 5: Ideal for multiple repairs or keeping spares on hand during long trips.
- Exact OEM Specs: Matches Mercury 911871 dimensions for drop-in installation.
- Durability Boost: Resists swelling, cracking, and hardening for longer service life.
- Marine-Grade Quality: Built to Sierra's rigorous standards, backed by decades of boating expertise.
Perfect Fit for Your Engine
The Sierra 18-7409 is a go-to choice for Mercury outboard enthusiasts, fitting a range of carburetor and fuel system applications on popular 2-stroke and 4-stroke models. It's commonly used in needle valve assemblies, float bowls, and primer bulb connections where precise sealing is critical. Verify compatibility with your engine's service manual to confirm it matches the 911871 reference, ensuring seamless integration with your existing setup.
Simple Installation Steps
Replacing O-rings is a straightforward DIY task that saves time and money. Here's a quick guide based on proven boater techniques:
- Clean the mating surfaces thoroughly to remove old residue or debris.
- Lubricate the new O-ring lightly with marine-grade silicone grease for easy seating.
- Inspect grooves for wear; replace if damaged to avoid premature failure.
- Install gently by hand—avoid tools that could pinch or stretch the ring.
- Test for leaks after reassembly by running the engine at idle and under load.
Pro tip: Always replace O-rings in pairs or kits when servicing carbs to maintain balanced pressure.
Maintenance Tips for Longevity
To maximize the life of your Sierra O-rings, perform routine inspections during annual tune-ups. Look for signs of wear like cracks, flat spots, or a shiny, glazed surface indicating chemical degradation. Flush fuel systems with stabilizer additives to combat ethanol damage, and store engines with full tanks to minimize moisture buildup. These habits can extend seal life by years, keeping you on the water instead of in the shop.
Frequently Asked Questions
What is the Sierra 18-7409 O-Ring used for?
This O-ring serves as a direct replacement for Mercury OEM 911871, primarily in carburetor fuel systems, needle valves, or float assemblies on outboard engines. It ensures airtight seals to prevent leaks and maintain optimal performance.
How many O-rings come in a Sierra 18-7409 package?
Each package contains five O-rings, providing excellent value for multiple repairs or spares during extended boating seasons.
Is the Sierra 18-7409 compatible with ethanol-blended fuels?
Yes, it's constructed from fuel-resistant materials that withstand E10 and higher ethanol blends, reducing swelling and degradation common in standard rubber seals.
Do I need special tools to install the Sierra 18-7409 O-Ring?
No special tools are required. Use clean hands or pick tools for seating, along with silicone lubricant, for a quick, tool-free install in most applications.
How can I tell if my O-ring needs replacement?
Inspect for cracks, tears, hardening, or fuel leaks around fittings. Swelling or a loss of elasticity often signals ethanol damage or age-related wear.
Why prefer Sierra over other aftermarket O-rings?
Sierra parts match OEM specs with superior marine durability, offering reliable performance trusted by professional mechanics and weekend boaters alike.
Can the Sierra 18-7409 be used in saltwater environments?
Absolutely. Its corrosion-resistant design handles saltwater exposure effectively when paired with proper engine flushing after use.
Buy with the best price Sierra 18-7409 O-Ring @5 1=Pkg 5 911871 for only $1 from NVN Marine! Same day shipping before 3pm.
Sierra 18-7409 O-Ring @5 1=Pkg 5 911871 Technical Specifications
| Type: | |
|---|---|
| Vendor: |
Sierra Engine Parts |
| Weight: |
0.02 lb |
Sierra 18-7409 O-Ring @5 1=Pkg 5 911871 User Reviews
Sierra 18-7409 O-Ring @5 1=Pkg 5 911871 Shipping & Return
| Shipping Weight: |
0.02 lb |
|---|---|
| Box Sizes: |
0.00 (h) x 4.00 (w) x 5.00 (l) |
| Cubic Feet: |
0.0 |
| Returnable: |
Yes |
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