Sierra 18-1165
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Within 30 days
Sierra 18-1165 Product Description
Why Your Yamaha Outboard Needs a Reliable Main Bearing Like the Sierra 18-1165
Picture this: you're out on the water, throttle wide open, when suddenly your engine starts vibrating like it's got a grudge. That's often a sign of worn main bearings robbing your Yamaha outboard of its smooth power. The Sierra 18-1165 steps in as the hero here—a precision-engineered main bearing designed specifically as a drop-in replacement for the Yamaha MC31-61100A. This isn't just any bearing; it's the #1 position main bearing that keeps your crankshaft spinning true, reducing friction, noise, and wear for years of trouble-free boating.
Boaters swear by it because it matches OEM specs without the premium price tag. Crafted from high-grade materials, it handles the heat and stress of marine environments better than generics, ensuring your engine delivers peak performance every time you hit the ignition.
Perfect Fit for Popular Yamaha Models
Engine compatibility is king when rebuilding or maintaining your outboard. The Sierra 18-1165 fits seamlessly into a range of Yamaha four-stroke powerhouses, including:
- F150 (various years)
- F200
- LF150
- LF200
- Z200
- And more—always cross-check your engine's service manual for exact match
Whether you're refreshing a well-loved workhorse or building a fresh powerhead, this bearing ensures everything aligns perfectly, saving you headaches during reassembly.
Top Benefits That Keep You on the Water Longer
Upgrading to the Sierra 18-1165 isn't about fixing a problem—it's about preventing downtime. Here's what sets it apart:
- Superior Durability: Tri-metal construction resists scoring and seizing under high loads.
- Precision Tolerances: Oil clearance optimized for Yamaha specs, promoting even lubrication and cooler operation.
- Quiet Operation: Minimizes knock and vibration for that factory-fresh hum.
- Cost-Effective Reliability: Aftermarket quality that rivals OEM, extending service intervals.
- Easy Sourcing: Readily available for DIY mechanics or pros alike.
Real-world feedback from forums and shops highlights how this bearing revives engines that were on their last legs, often adding thousands of hours before the next overhaul.
Pro Tips for Installing Your Sierra 18-1165 Main Bearing
Installation is straightforward if you prep right. Start by thoroughly cleaning the main bearing saddles—any debris can lead to premature failure. Use a plastigage to verify clearances (aim for Yamaha's .0014-.0022 inch spec). Lubricate generously with assembly lube before dropping it in, and torque the caps to factory specs in sequence.
Pro hack: While you're in there, inspect adjacent bearings and thrust washers. A full main bearing set refresh is smarter than piecemeal swaps. Break it in easy—idle for 20 minutes post-install before WOT runs. This bearing thrives on proper care, rewarding you with bulletproof performance.
Maximize Longevity: Maintenance Best Practices
To get the most from your Sierra 18-1165, pair it with solid habits. Change oil every 100 hours or annually with Yamalube or a high-quality FC-W synthetic. Monitor for metal flakes in filters—a early warning for bearing wear. Saltwater users, flush religiously to fend off corrosion.
Listen to your engine: unusual rattles or oil pressure drops mean check time. With vigilant care, this bearing can outlast expectations, keeping your adventures uninterrupted.
Frequently Asked Questions
What Yamaha models does the Sierra 18-1165 main bearing fit?
It fits models like F150, F200, LF150, LF200, and Z200. Confirm with your engine's parts diagram for precision.
Is the Sierra 18-1165 a direct replacement for Yamaha MC31-61100A?
Yes, it's engineered as a precise OEM equivalent, matching dimensions and materials for hassle-free swaps.
How do I know if my main bearing needs replacing?
Look for low oil pressure, knocking sounds, or excessive vibration at idle. Oil analysis can spot metal particles early.
What's the difference between Sierra and OEM bearings?
Sierra offers comparable quality at lower cost, with proven reliability in marine applications—no compromises on performance.
Can I install the Sierra 18-1165 myself?
Absolutely, with basic tools and mechanical know-how. Use plastigage for checks and follow torque specs for best results.
How long does this bearing typically last?
With proper maintenance, 500-1000+ hours, depending on usage, oil quality, and operating conditions.
Save $1 when you buy the Sierra 18-1165 for only $40 from NVN Marine! Same day shipping before 3pm.
Sierra 18-1165 Technical Specifications
| Type: | |
|---|---|
| Vendor: |
Sierra Engine Parts |
| Weight: |
0.44 lb |
Sierra 18-1165 User Reviews
Sierra 18-1165 Shipping & Return
| Shipping Weight: |
0.44 lb |
|---|---|
| Box Sizes: |
1.00 (h) x 6.00 (w) x 7.00 (l) |
| Cubic Feet: |
42.0 |
| Returnable: |
Yes |
For detailed shipping policy please check our Shipping Policy and you can find our Return and Refund Policy here.