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663-44553-01-8B 663-44553-00-8B 663-44553-01 663-44553-00
PREMARINE
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1. Technical Specifications
| Parameter | Specification / Detail |
| Component Type | Outboard Lower Mount Damper Retaining Cover / Housing Plate |
| OEM & Interchange Part Numbers | 663-44553-01-8B / 663-44553-00-8B / 663-44553-01 / 663-44553-00 |
| Installation Location | Lower mount pocket on the swivel bracket assembly (outer retention plate) |
| Engine Platform | 2-Cylinder & 3-Cylinder 2-Stroke Mid-Range Outboards (663 / 697 Series) |
| Horsepower Range | Yamaha 40HP, 48HP, 55HP 2-Stroke models (e.g., 40E, 48A, 55B, E48C) |
| Color & Finish | Yamaha 8B Shiny Metallic Blue / Dark Blue Enamel |
| Material Composition | Marine-grade high-tensile die-cast aluminum alloy with anti-corrosion coating |
2. Key Features & Functionality
Rigid Damper Preload & Retention: Serves as the external structural clamping plate that compresses and locks the rubber damper inside the swivel bracket pocket, preventing damper displacement under heavy thrust.
Environmental Shielding: Encapsulates the internal elastomer to protect it from direct saltwater impingement, sunlight UV degradation, and physical impact.
Yamaha 8B Marine Baked Finish: Multi-stage chemical surface passivation and baked metallic blue enamel resist saltwater galvanic oxidation, pitting, and flaking.
Precision CNC Mating Flange: Fastener hole spacing and internal damper seating pockets are machined to strict OEM tolerances for a flush, stress-free fit.
3. Compatible Models
Primarily compatible with Yamaha 2-stroke mid-horsepower outboard platforms:
Yamaha 40 HP 2-Stroke Series: 40E, 40EJ, 40EL (663 platform)
Yamaha 48 HP 2-Stroke Series: 48A, 48B, E48C commercial & recreational models
Yamaha 55 HP 2-Stroke Series: 55B, 55BE, 55BET, E55C models
Clone Engines: Compatible with Parsun, Hidea, and other outboard brands utilizing the Yamaha 663/697 swivel bracket architecture
4. Aftermarket & Brand Compatibility
OEM Brand Fitment:
Yamaha Marine: Designed for genuine Yamaha 40HP through 55HP lower engine mount retention systems.
PREMARINE Brand Aftermarket Replacement:
PREMARINE Quality Standard: PREMARINE specializes in high-durability marine bracket components, mount covers, and transom hardware. This lower mount cover is manufactured using high-pressure die-cast aluminum alloy tooling.
Direct OEM-Level Performance: Flange alignment, casting tensile strength, and corrosion-resistant paint life meet or exceed OEM specifications, serving as the premier cost-effective choice for transom bracket rebuilds.
5. Common Symptoms & Troubleshooting
Cracked Cover Body or Fractured Bolt Mounting Lugs:
Cause: Severe underwater impact on the lower casing or metal fatigue from repeated heavy reverse thrust.
Troubleshooting: Inspect the outer casting for cracks; replace immediately to prevent the lower mount rubber from dislodging.
Severe Galvanic Pitting, Blistering Paint, or Stripped Threads:
Cause: Sacrificial anode depletion allowing aggressive saltwater pitting corrosion on the cast aluminum cover.
Troubleshooting: Visually inspect the housing; replace heavily corroded covers and apply marine anti-seize to fasteners during installation.
Loose Lower Engine Mount Pocket / Transom Slop:
Cause: Loose retaining bolts or a warped cover failing to apply uniform clamping pressure on the damper rubber.
Troubleshooting: Check bolt torque; ensure the cover is seated squarely against the swivel bracket housing.
OEM Part Numbers
Compatible OEM references include:
663-44553-01-8B
663-44553-00-8B
663-44553-01
663-44553-00
Compatible Engine Models
This Lower Mount Cover is primarily designed for:
2-Stroke 40/48/55HP
If you are unsure about compatibility, please provide your engine model number or identification plate for verification before ordering.
Applications
This Lower Mount Cover 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
