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6B4-44147-00 6B4-44147-00-00
PREMARINE
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1. Technical Specifications
| Parameter | Specification / Detail |
| Component Type | Marine Vertical Shift Rod Rubber Dust/Water Seal Boot |
| OEM & Interchange Part Numbers | 6B4-44147-00-00 / 6B4-44147-00 |
| Installation Location | Upper-to-lower casing junction around the vertical shift rod passage |
| Engine Platform | Inline-2 Cylinder 2-Stroke 246cc Marine Outboard Engines (Yamaha 6B4 series) |
| Horsepower Range | Yamaha 9.9HP and 15HP 2-Stroke models (9.9D, 15D, E9.9D, E15D, etc.) |
| Design Configuration | Flexible accordion bellows boot with integrated positive retention clamping lips |
| Material Composition | Marine-grade high-tensile, oil-resistant Chloroprene / NBR vulcanized rubber |
| Operating Conditions | Resists marine salt spray, unburned two-stroke fuel mist, exhaust thermal cycles, and repetitive shift cycling |
2. Key Features & Functionality
Dynamic Contaminant Exclusion: Flexible accordion convolution design expands and contracts smoothly during Forward (F), Neutral (N), and Reverse (R) shift strokes, keeping grit and corrosive water away from the linkage guide bore.
Fuel & Oil Chemical Resistance: Formulated with marine elastomers resistant to fuel vapors, 2-stroke oil, and thermal cycling, preventing premature swelling or cracking.
Prevents Linkage Sticking & Wear: Provides compliant centering guidance for the moving rod, eliminating metal-to-metal rattle and preventing abrasive scoring along the shaft.
Precision Factory Sealing Fit: Engineered to strict OEM interference tolerances, locking firmly onto the shift rod shoulder and casing recess without slipping off underway.
3. Compatible Models
Primarily compatible with Yamaha 2-stroke 9.9HP–15HP engines on the 6B4 architecture:
Yamaha 2-Stroke Series: 9.9D, 15D, E9.9D, E15D (both recreational and commercial Enduro editions)
Clone Engines: Compatible with Parsun (6B4-type T9.9 / T15), Hidea (HD9.9 / HD15), Powertec, Seapro, and other outboard brands utilizing the Yamaha 6B4 shift linkage layout
4. Aftermarket & Brand Compatibility
OEM Brand Fitment:
Yamaha Marine: Designed for genuine Yamaha 9.9HP/15HP (6B4 platform) shift control rod linkages.
PREMARINE Brand Aftermarket Replacement:
PREMARINE Quality Standard: PREMARINE specializes in high-durability marine rubber bellows, seals, isolation dampeners, and shift linkages. This shift rod boot is molded with precision tooling using reinforced elastomers.
Direct OEM-Level Performance: Cyclic fatigue life, ozone cracking resistance, and lip retention torque meet or exceed OEM specifications, serving as the premier cost-effective choice for preventing shift rod binding and corrosion during lower unit service.
5. Common Symptoms & Troubleshooting
Stiff, Binding, or Gritty Shift Lever Action:
Cause: A split or deteriorated boot allowing sand, mud, and saltwater to collect inside the rod guide bushing, causing friction and galling.
Troubleshooting: Visually inspect the rubber boot; if torn, clean out all contamination from the shift rod tunnel, lubricate with marine grease, and install a fresh boot.
Hardened, Brittle, or Disintegrated Rubber:
Cause: Thermal degradation from nearby exhaust cavities combined with long-term UV and ozone exposure.
Troubleshooting: Squeeze the boot during routine lower unit maintenance; if the rubber feels brittle or shows surface micro-cracks, replace it immediately.
Moisture Ingress and Grease Washout Around Lower Cowling Base:
Cause: Loose or stretched mounting lips causing the boot to slide off its retention boss.
Troubleshooting: Ensure both ends of the boot snap into their machined locating grooves; if the boot is stretched and loose, replace with a new unit.
OEM Part Numbers
Compatible OEM references include:
6B4-44147-00
6B4-44147-00-00
Compatible Engine Models
This Shift Rod Boot is primarily designed for:
2-Stroke 9.9/15HP
If you are unsure about compatibility, please provide your engine model number or identification plate for verification before ordering.
Applications
This Shift Rod Boot 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
