Sierra 18-3356 Yamaha Water Pump Housing
Sierra 18-3356 Yamaha Water Pump Housing — Product description
Keep your Yamaha outboard running cool and reliable with the Sierra 18-3356 water pump housing, a precision-engineered replacement designed for seamless performance on the water. Crafted from high-grade, corrosion-resistant materials, this housing withstands harsh marine environments, preventing leaks and ensuring consistent water flow to protect your engine from overheating during long days on the lake or open sea.
Why Choose Sierra 18-3356 for Your Yamaha Outboard?
Sierra stands out in the marine aftermarket world for delivering parts that match or exceed original equipment standards without the premium price tag. The 18-3356 housing features exact-fit tolerances, making it a go-to choice for DIY boaters and professional mechanics alike. Unlike flimsy generics, its robust construction handles vibration, salt exposure, and constant water pressure, extending the life of your impeller and pump assembly.
- Durable Construction: Impact-resistant plastic formulated for marine use, resisting UV degradation and chemical exposure.
- Precise Dimensions: Direct OEM replacement specs for hassle-free bolt-on installation.
- Enhanced Cooling: Optimized internal geometry promotes efficient water circulation, critical for two-stroke and four-stroke engines under load.
Perfect Compatibility Across Yamaha Models
This versatile housing fits a wide range of Yamaha outboards, covering both two-stroke and four-stroke configurations. It's engineered to integrate flawlessly with factory water pump kits, ensuring no modifications are needed.
| Engine Type | Horsepower | Model Years |
|---|---|---|
| Two-Stroke | 9.9hp - 15hp | 1996 and newer |
| Four-Stroke | 6hp - 8hp | 2001 and newer |
| Four-Stroke | 9.9hp | 2006 and newer |
| Four-Stroke | 15hp | 1998 and newer |
Before installing, double-check your engine's serial number against Yamaha's model guides to confirm fitment—peace of mind starts with the right match.
Signs Your Water Pump Housing Needs Replacement
Spotting issues early can save your engine from catastrophic failure. Watch for these common symptoms:
- Steam or vapor from the tell-tale hose, indicating restricted flow.
- Cracks, brittleness, or discoloration on the housing after flushing with fresh water.
- Overheating warnings during idle or trolling, even with a clean impeller.
- Reduced pee stream from the exhaust— a classic red flag for pump problems.
Regular inspections during off-season storage reveal wear before it strands you mid-trip.
Installation Tips for Smooth DIY Service
Replacing the water pump housing is a straightforward job that takes under an hour with basic tools. Here's a pro tip sequence:
- Disconnect the battery and tilt the outboard for access.
- Remove the lower unit screws and carefully separate the gearcase.
- Extract the old housing, noting gasket orientation.
- Install the new Sierra 18-3356 with fresh sealant on mating surfaces.
- Torque to spec, reassemble, and test-run in a barrel of water.
Pro Tip: Always replace the impeller and gaskets at the same time for a complete refresh—it's the golden rule for longevity.
Long-Term Maintenance for Peak Performance
Pair this housing with annual impeller swaps and post-use freshwater flushes to maximize uptime. In saltwater environments, consider a corrosion inhibitor flush every 50 hours. Boat owners report this combo keeps cooling systems reliable for 3-5 seasons, even in demanding conditions like fishing tournaments or coastal cruising.
Frequently Asked Questions
Does the Sierra 18-3356 fit all Yamaha 9.9hp outboards?
It fits two-stroke 9.9hp-15hp models from 1996 onward and select four-stroke 9.9hp from 2006. Verify your specific model year for exact compatibility.
Is this housing made of the same material as OEM Yamaha parts?
Yes, Sierra uses a comparable high-strength, corrosion-resistant thermoplastic that meets or exceeds OEM durability standards for marine applications.
Can I install the Sierra 18-3356 without special tools?
Basic hand tools like screwdrivers, wrenches, and a torque wrench suffice. No specialized gearcase pullers are typically required.
How often should I replace the water pump housing?
Inspect annually; replace every 3-5 years or at the first sign of cracks/leaks, especially in saltwater use.
Will this fix overheating on my Yamaha 15hp?
If the housing is cracked or warped, yes— it restores proper water flow. Check impeller and thermostat too for full diagnosis.
Is Sierra 18-3356 suitable for freshwater and saltwater?
Absolutely, its materials handle both environments with proper maintenance like regular flushing.
SKU: NVN-4003287
MPN: 18-3356
UPC: 808282292577
Technical specifications
| Brand | Sierra Engine Parts |
| Model | Sierra 18-3356 Yamaha Water Pump Housing |
| SKU / MFR# | 4003287 |
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