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66T-11565-00 66T-11565-00-00
PREMARINE
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1. Technical Specifications
| Parameter | Specification / Detail |
| Component Type | Crankshaft Main Bearing Cover Washer / Retaining Shim |
| OEM & Interchange Part Numbers | 66T-11565-00-00 / 66T-11565-00 |
| Installation Location | Crankshaft & Piston Assembly (Between crankshaft main bearing face and cover plate) |
| Engine Platform | Inline-2 Cylinder 2-Stroke Marine Outboard Engines (66T / E40X 703cc platform) |
| Horsepower Range | Yamaha 40HP 2-Stroke models (40X, E40X, 40XMH, 40XW, 40XWT, etc.) |
| Material Composition | Heat-treated high-tensile alloy spring steel with anti-wear blackened finish |
| Operating Conditions | Submerged in 2-stroke fuel/oil mist, subject to axial thrust pulses, high RPM, and heat |
2. Key Features & Functionality
Accurate Axial End-Play Control: Precision-calibrated thickness ensures proper end-play tolerance for the crankshaft main bearing, preventing axial walk and driveline bind.
High Wear & Compressive Strength: Heat-treated alloy steel construction resists compressive deformation, micro-welding, and fatigue fractures under wide-open-throttle (WOT) operations.
Micro-Finished Flatness & Deburred Radii: Ground to tight parallelism tolerances with cleanly deburred edges to ensure uniform clamping pressure across the bearing face.
Direct OEM Fitment: Inner/outer diameters and locating geometries strictly match original factory blueprints for seamless drop-in fitment during powerhead overhauls.
3. Compatible Models
Primarily compatible with Yamaha 40HP 2-stroke outboards built on the 66T engine architecture:
Yamaha 2-Stroke 66T Series: E40X, 40X, 40XMH, 40XW, 40XWT 703cc twin-cylinder models
Clone Engines: Compatible with Parsun (T40), Hidea (HD40), Powertec, Seapro, and other outboard brands utilizing the Yamaha 66T 40HP crankshaft layout
4. Aftermarket & Brand Compatibility
OEM Brand Fitment:
Yamaha Marine: Designed for genuine Yamaha 40HP (E40X / 66T series) crankshaft and main bearing support systems.
PREMARINE Brand Aftermarket Replacement:
PREMARINE Quality Standard: PREMARINE specializes in high-reliability marine crankshaft rotating assemblies, thrust shims, bearing washers, and powerhead hardware. This washer is manufactured with precision stamping tooling and controlled-atmosphere heat treatment.
Direct OEM-Level Performance: Parallelism tolerances, Rockwell hardness, and thickness consistency meet or exceed OEM specifications, serving as the premier cost-effective choice for preventing crankshaft end-play noise and premature bearing failure.
5. Common Symptoms & Troubleshooting
Excessive Crankshaft End-Play / Deep Metallic Knocking:
Cause: Worn or thinned bearing washer from prolonged service, or failure to install the washer during prior rebuilds.
Troubleshooting: Measure crankshaft axial clearance with a dial indicator; replace the bearing cover washer if clearance exceeds factory service limits.
Premature Main Bearing Failure or Overheating:
Cause: A distorted, burred, or warped washer applying uneven axial preload onto the bearing outer race.
Troubleshooting: Inspect the mating surfaces during powerhead disassembly; discard and replace any scored or warped washer.
Surface Pitting, Scoring, or Cracking:
Cause: Debris circulation within the crankcase or severe powerhead hydraulic shock/seizure.
Troubleshooting: Thoroughly clean crankcase oil passages and install a new bearing cover washer along with fresh bearings during rebuild.
OEM Part Numbers
Compatible OEM references include:
66T-11565-00
66T-11565-00-00
Compatible Engine Models
This Bearing Cover Washer is primarily designed for:
2-Stroke 40HP
If you are unsure about compatibility, please provide your engine model number or identification plate for verification before ordering.
Applications
This Bearing Cover Washer 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
