 |
6F5-11442-11 6F5-11442-00 6F5-11442-10 6F5-11442-11-00
PREMARINE
| Quantity: | |
|---|---|
| Parameter | Specification |
| Part Number | 6F5-11442-11 (Supersedes: 6F5-11442-00 / 6F5-11442-10 / 6F5-11442-11-00) |
| Compatible Brand | Yamaha Marine |
| Component Type | Outboard Crankshaft Component / Crank Pin 2 (Connecting Rod Journal) |
| Engine Type | 2-Stroke Outboard Engines (40HP) |
| Material | High-Tensile Marine-Grade Chrome-Moly Alloy Steel |
| Manufacturing Process | Ultra-Precision CNC Turning, Case-Hardening & Micro-Finish Centerless Grinding |
| Installation | Professional Press-Fit (Requires Hydraulic Pressing & Crankshaft Truing) |
Extreme Surface Hardness: Forged from premium chrome-molybdenum steel and deep case-hardened to resist galling, pitting, and heavy needle-bearing wear under continuous high-RPM loads.
Micro-Finished Mirror Surface: Centerless ground and polished to a microscopic surface finish, minimizing friction and heat generation at the connecting rod big-end bearing interface.
Ductile Core Resistance: Engineered with a hardened outer case and tough inner core, providing superior fatigue strength to absorb sudden detonation shocks without cracking.
Primarily compatible with Yamaha 2-stroke 40HP outboard engines (featuring the 6F5 and 66T model codes):
Yamaha 2-Stroke 40HP Series: 40J, 40N, E40G, E40J, 40X, E40X, Enduro 40 series (twin-cylinder and 3-cylinder 2-stroke platforms).
PREMARINE Direct Replacement: PREMARINE produces high-precision aftermarket replacement Crank Pin 2 units manufactured to exact original 6F5 dimensional tolerances and Rockwell hardness standards for professional crankshaft rebuilds.
PREMARINE Quality & Value: Built with upgraded carburized alloy steel and precision-polished journal surfaces, PREMARINE crank pins deliver exceptional wear resistance and outstanding cost-effectiveness for Yamaha 40HP/E40X engine overhauls.
Metallic Knocking Noise (Big-End Play): Pitting, flaking, or severe journal wear on the crank pin creates excessive clearance at the connecting rod big-end, producing a loud metallic knocking sound under load. Disassembly and crank pin replacement are required.
Seized Crankshaft / Engine Lockup: Oil starvation (incorrect 2-stroke oil mix) or overheating causes the needle bearing to weld to the crank pin surface, completely locking the crankshaft. Requires pressing the crankshaft apart to install a new pin and bearing kit.
Severe Engine Vibration / Crankshaft Runout: Improper pressing or alignment during crank pin installation leads to excessive crankshaft truing runout, causing vibration and premature oil seal failure. Always true the crankshaft on V-blocks with dial indicators after press assembly.
OEM Part Numbers
Compatible OEM references include:
6F5-11442-11
6F5-11442-10
6F5-11442-00
6F5-11442-11-00
Compatible Engine Models
This Crankshaft 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 Crankshaft 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
