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6E5-44352-01 6E5-44352-00 6E5-44352-03
PREMARINE
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1. Technical Specifications
| Parameter | Specification / Detail |
| Component Type | Outboard Lower Unit Cooling Water Pump Flexible Rubber Impeller |
| OEM & Interchange Part Numbers | 6E5-44352-01-00 / 6E5-44352-01 / 6E5-44352-00 / 6E5-44352-03 |
| Installation Location | Lower unit gearcase water pump cartridge housing (Repair Kit / Water Pump chapter) |
| Engine Platform | Inline-4, V4, and V6 2-Stroke & 4-Stroke Marine Outboard Platforms |
| Horsepower Range | Yamaha 115HP to 300HP (2-stroke 115–250HP; 4-stroke F115, F150, F200, F225, F250, etc.) |
| Vane Configuration | 6-Blade flexible elastomeric curved centrifugal profile |
| Drive Shaft Interface | Precision machined semicircular keyway (matches drive key 90280-04M04) |
| Material Composition | Marine high-tensile Chloroprene Rubber (CR) / NBR + CNC-machined marine brass hub |
| Key Dimensions | Outer Diameter: $\approx 89.0\text{ mm}$, Height/Depth: $\approx 31.0\text{ mm}$, Shaft Bore: $\approx 22.4\text{ mm}$ |
2. Key Features & Functionality
High-Flow Displacement Dynamics: Features 6 curved, flexible vanes that compress and expand rhythmically against the eccentric pump cup, delivering stable water flow and pressure across low and high RPM ranges.
Corrosion-Resistant Brass Hub Bonding: The heavy brass center core undergoes chemical etching and primer coating prior to high-pressure vulcanization, preventing hub-to-rubber delamination and slip under full throttle acceleration.
Chemical, Salt & Abrasion Defense: Marine-grade rubber resists ozone embrittlement, hot-water degradation, and abrasive sediment scoring often encountered in shallow waters and tidal estuaries.
Low Compression-Set Memory: Vanes resist taking a permanent bent set during seasonal winter storage, recovering instant elastomeric flexibility and positive cavity contact when re-commissioned.
3. Compatible Models
Primarily compatible with Yamaha mid-to-high horsepower outboards:
Yamaha 2-Stroke V4 / V6 Series: 115HP (115B, 115C), 130HP, 150HP (150F, ProV 150), 175HP, 200HP, 225HP, 250HP
Yamaha 4-Stroke Series: Early F115, F150 (F150A/TXR), F200, F225, F250 (3.3L V6 engines)
Clone Engines: Compatible with Parsun (T75 / T85 / T90 / T115), Hidea, Powertec, Seapro, and other outboard brands utilizing the Yamaha 6E5 style water pump system
4. Aftermarket & Brand Compatibility
OEM Brand Fitment:
Yamaha Marine: Engineered for genuine Yamaha 115HP through 300HP water pump cooling systems.
Industry Interchange References:
Sierra Marine: 18-3071
Mallory Marine: 9-45603
CEF Marine: 500318
PREMARINE Brand Aftermarket Replacement:
PREMARINE Quality Standard: PREMARINE specializes in high-reliability outboard water pump impellers, rebuild kits, gaskets, and drive hardware. This impeller is vulcanized using reinforced chloroprene rubber compounds and precision brass inserts.
Direct OEM-Level Performance: Tensile strength, flex-fatigue life, operating head pressure, and cavitation resistance meet or exceed OEM specifications, serving as the premier cost-effective consumable to protect large powerheads against catastrophic overheating and cylinder scuffing.
5. Common Symptoms & Troubleshooting
Overheating Alarm Buzzing / Weak or Absent Telltale Indicator Stream:
Cause: Vanes sheared off at the root from age fatigue, or destroyed due to dry running without water lubrication.
Troubleshooting: Dismantle the pump housing and inspect the impeller; if blades are torn, missing, or lodged in the cooling channels, flush out debris and install a new impeller.
Normal Cooling at Idle, but Overheating Occurs at High Speed:
Cause: Vanes have lost their elastic stiffness; hydrodynamic water resistance flattens the vanes against the hub at high RPMs, reducing displacement.
Troubleshooting: Inspect blade elasticity and root thickness; if the vanes feel soft or display stress cracks, replace the impeller immediately.
Loud Squealing from Lower Casing / Slipped Hub Syndrome:
Cause: Engine started dry out of water; instantaneous friction heat melts the rubber-to-brass interface, causing the hub to spin independently of the rubber body.
Troubleshooting: Remove the impeller and verify mechanical cohesion between the brass insert and rubber body; if the core spins freely, install a replacement unit.
OEM Part Numbers
Compatible OEM references include:
6E5-44352-01
6E5-44352-00
6E5-44352-03
Compatible Engine Models
This Water Pump Rubber Impeller is primarily designed for:
2-Stroke 115/130/150/175/200/225/250HP
4-Stroke 115/150/200/225/250HP
If you are unsure about compatibility, please provide your engine model number or identification plate for verification before ordering.
Applications
This Water Pump Rubber Impeller is commonly used for:
Outboard engine repair
Engine rebuilding projects
Marine maintenance workshops
Boat fleet maintenance
Commercial fishing vessels
Recreational boats
Marine spare parts distribution
