Sierra 18-4704
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Within 30 days
Sierra 18-4704 Product Description
Keeping your outboard motor running smoothly starts with the smallest components, like a dependable drain screw. The Sierra 18-4704 drain screw stands out as a go-to replacement for boat owners tackling routine maintenance. Crafted from durable stainless steel, it resists corrosion from saltwater exposure and harsh marine environments, ensuring your engine's oil stays contained during those long days on the water.
Whether you're draining oil after a season of heavy use or prepping for winter storage, this precision-engineered part threads perfectly to prevent leaks that could lead to bigger headaches. Boat enthusiasts know that a faulty drain plug can turn a simple service into a messy ordeal—choose reliability with Sierra's proven design.
Key Features That Make a Difference
- Corrosion-Resistant Construction: Marine-grade stainless steel holds up against rust and pitting, ideal for both freshwater and saltwater applications.
- Exact OEM Specifications: Matches the thread size and length of original equipment, typically 5/16-18 x 0.88 inches, for a seamless fit without modifications.
- Easy Torque Application: Hex head design allows for secure tightening with standard tools, reducing the risk of stripping.
- Universal Compatibility: Serves as a direct replacement for multiple outboard brands, saving time on part hunting.
Why It Outshines Generic Alternatives
Unlike bargain-bin plugs that warp or seize over time, the Sierra 18-4704 delivers consistent performance. Boaters report fewer instances of stuck screws during oil changes, which means less frustration and more time enjoying the ride. It's the kind of part that quietly prevents downtime, letting you focus on what matters—being out on the boat.
Perfect Fit for Popular Outboard Engines
This drain screw aligns with a range of engines from leading manufacturers, including those from Mercury, Force, and Chrysler outboards. It's commonly used on 2-stroke and 4-stroke models where precise drainage is key. Always cross-reference your engine manual to confirm, but its versatility makes it a staple in marine repair kits.
Step-by-Step Installation Guide
- Park your boat on a level surface and let the engine cool completely to avoid burns.
- Place a catch pan beneath the drain hole to collect old oil.
- Using a wrench, carefully loosen the old screw counterclockwise—apply penetrating oil if it's seized.
- Clean the threads on the engine block with a brush for optimal sealing.
- Hand-thread the new Sierra 18-4704 screw until snug, then torque to manufacturer specs (usually 8-12 ft-lbs) to avoid over-tightening.
- Wipe away excess oil and refill with fresh lubricant.
Pro tip: Apply a light coat of marine grease or anti-seize compound to the threads for even easier removal next time.
Maintenance Tips to Extend Engine Life
A quality drain screw like the Sierra 18-4704 is only as good as your maintenance routine. Change oil every 50-100 hours of operation, or annually, whichever comes first. Inspect the screw for wear during each service—look for galling or elongation. Pair it with a crush washer or O-ring if specified by your engine model for a drip-free seal. Regular checks keep contaminants out and performance high, avoiding costly overhauls down the line.
For saltwater warriors, rinse the lower unit after every outing and store in a dry spot. This simple habit, combined with Sierra's robust parts, ensures your motor fires up reliably season after season.
Frequently Asked Questions
What is the Sierra 18-4704 drain screw used for?
The Sierra 18-4704 is a replacement oil drain screw designed for outboard marine engines. It allows for safe and efficient drainage of used oil during routine maintenance.
Is the Sierra 18-4704 compatible with Mercury outboards?
Yes, it fits many Mercury outboard models, as well as select Force and Chrysler engines. Verify against your specific model for exact match.
What material is the Sierra 18-4704 drain screw made from?
It's constructed from high-grade stainless steel, providing excellent resistance to corrosion in marine environments.
How do I remove a stuck drain screw before installing the Sierra 18-4704?
Apply penetrating oil, let it soak, then use a proper-fitting wrench. Heat gently if needed, but avoid excessive force to prevent thread damage.
Does the Sierra 18-4704 require a washer or gasket?
It works best with the OEM-style crush washer if your engine uses one. Check your service manual for specifics.
Can I use the Sierra 18-4704 on 4-stroke engines?
Absolutely, it's suitable for both 2-stroke and 4-stroke outboards where the drain port matches its specifications.
What's the torque specification for installing this drain screw?
Typically 8-12 ft-lbs, but always follow your engine manufacturer's recommended torque to ensure a proper seal without damage.
Buy with the best price Sierra 18-4704 for only $4 from NVN Marine! Same day shipping before 3pm.
Sierra 18-4704 Technical Specifications
| Type: | |
|---|---|
| Vendor: |
Sierra Engine Parts |
| Weight: |
0.02 lb |
Sierra 18-4704 User Reviews
Sierra 18-4704 Shipping & Return
| Shipping Weight: |
0.02 lb |
|---|---|
| Box Sizes: |
4.00 (h) x 0.00 (w) x 4.00 (l) |
| Cubic Feet: |
0.0 |
| Returnable: |
Yes |
For detailed shipping policy please check our Shipping Policy and you can find our Return and Refund Policy here.