









688-15100-05-94
Crankcase Assembly, Yamaha,
For Outboard: Yamaha 50, Yamaha 75, Yamaha 85
688-15100-03-94
Crankcase Assy, Yamaha,
For Outboard: Yamaha 80, Yamaha 90
688-15100-06-1S
Crankcase Assy, Yamaha,
For Outboard: Yamaha 75
Features:
| 1. Robust Construction: Built to handle the stresses of combustion and engine operation, the crankcase assembly is designed with durability in mind, ensuring long-lasting performance. |
| 2. Integrated Design: The crankcase typically incorporates various features such as oil passages, mounting points for the crankshaft, and seals, allowing for a compact and efficient assembly. |
| 3. Corrosion Resistance: Constructed from materials that resist corrosion, the crankcase assembly is designed to endure the harsh marine environment, preventing rust and degradation over time. |
| 4. Precision Engineering: Engineered to precise specifications, the crankcase assembly ensures proper alignment and functioning of internal components, contributing to the overall efficiency of the engine. |
Functions:
| 1. Housing for Crankshaft: The crankcase serves as the primary housing for the crankshaft, allowing it to rotate freely while providing necessary support and alignment. |
| 2. Oil Containment: It contains the engine oil, providing lubrication to the moving parts and facilitating proper cooling during operation. |
| 3. Pressure Regulation: The crankcase helps regulate internal pressure during the combustion process, contributing to the overall efficiency and performance of the engine. |
| 4. Mounting Points: It provides mounting points for various components such as the oil pump, ignition system, and other engine parts, allowing for a compact engine design. |
Maintenance Tips:
| 1. Regular Oil Changes: Change the engine oil and filter according to the manufacturer's recommendations to ensure proper lubrication and prevent buildup of contaminants. |
| 2. Inspect for Leaks: Regularly check for oil leaks around the crankcase assembly and seals. Address any leaks immediately to prevent oil loss and potential engine damage. |
| 3. Clean the Exterior: Keep the exterior of the crankcase clean to prevent dirt and debris buildup. This helps maintain visibility for inspections and reduces the risk of corrosion. |
| 4. Check Fasteners: Ensure that all mounting bolts and fasteners are properly tightened. Loose fasteners can lead to alignment issues and potential damage during operation. |
| 5. Monitor Engine Performance: Pay attention to any changes in engine performance, such as unusual noises or vibrations, which may indicate issues within the crankcase assembly. |
Common Issues and Symptoms:
| 1. Oil Leaks: Leaking oil around the crankcase assembly can indicate worn seals or gaskets, which should be replaced to prevent oil loss and engine damage. |
| 2. Cracks or Damage: Inspect for any visible cracks or damage to the crankcase. Damage can compromise structural integrity and lead to engine failure. |
| 3. Excessive Wear: Over time, internal components such as the crankshaft bearings may wear down, causing increased play or noise. Regular inspections can help catch these issues early. |
| 4. Corrosion: Corrosion, particularly in saltwater environments, can weaken the crankcase assembly. Regular cleaning and protective coatings can help mitigate this issue. |
| 5. Pressure Loss: If the engine exhibits signs of reduced power or pressure loss, it may indicate issues within the crankcase assembly that require further investigation. |
More Products We Have:
| BEARING | HOUSING,WATER PUMP |
| BOLT / SCREW | IMPELLER |
| BUSHING / COLLAR | VALVE / JET,MAIN |
| BRACKET | KEY,WOODRUFF |
| CABLE, REMOTE/STEERING / | MOUNT DAMPER |
| THROTTLE/STEERING SYSTEM | NUT |
| CAP LOWER CASING | OIL SEAL |
| CARBURETOR ASSY / REPAIR KIT | O-RING |
| CDI / CABLE,BATTERY / RELAY ASSY | OUTER PLATE |
| COIL / PLUG,SPARK | PIN,CROSS/DRIVE/ |
| CARTRIDGE INSERT | STRAIGHT/COTTER |
| CLIP | PISTON |
| CLUTCH DOG / BALL | PISTON PIN |
| CONNECTING ROD | PISTON RING |
| CRANK PIN | PROPELLER |
| CRANKSHAFT | PROPELLER SHAFT |
| DIAPHRAGM | WATER PUMP REPAIR KIT |
| DAMPER, WATER SEAL | REMOTE CONTROL ASSY |
| DRIVE SHAFT | SEAL,LABYRINTH |
| FILTER | SLEEVE LINER |
| FUEL PUMP | SPACER |
| FUEL PARTS | SPRING |
| FLOAT | STARTER |
| GASKET | SWITCH ASSY |
| GASKET KIT | THERMOSTAT |
| GEAR / PINION ASSY | WASHER/SHIM |
| TAB-TRIM | ANODEIN |
| NEW GEAR |










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