Description
Technical Overview & Product Details
“Dry bush” (or dry-running bushing) refers to a self-lubricating bearing designed to operate without the need for an external, pressurized oil supply at the contact surface, although it is often used in environments where incidental oil splash occurs. These bushes are critical for maintaining tight tolerances in rotating or oscillating pivots, such as the rocker arm shaft or linkage joints, where traditional ball bearings would fail due to the high-frequency vibration and impact loads of the valve train.
- Compatible Engine Type: Yanmar 6N18 (A)L-V series marine propulsion and auxiliary engines.
- Part Number / Designation: 24550-031150.
- Dimensions: 31mm (Outer Diameter) x 15mm (Width).
- Component Type: Dry-running (Self-lubricating) Bearing Bush.
- Material: Sintered bronze/steel backing with a low-friction PTFE or specialized wear-resistant liner.
- Application: Rocker arm assemblies and valve train pivot points.
Key Features & Performance
- Self-Lubricating Surface: The liner is engineered to reduce friction and eliminate “stick-slip” motion, ensuring smooth movement even during cold starts before full oil pressure is achieved.
- High Load Capacity: Built to withstand the immense cyclic forces transmitted through the valve train, providing a stable bearing surface that prevents shaft-to-housing metal contact.
- Wear Resistance: The sintered material and specialized coating offer exceptional resistance to abrasive wear, which is vital for the long maintenance intervals required in marine operations.
- Precision Tolerance: Machined to exact internal and external diameters to ensure a secure press-fit into the rocker arm or housing, preventing migration or rotation of the bush.
Why Source from Heybeli Marine?
A worn bushing leads to “play” in the rocker assembly, causing erratic valve clearance and reduced engine efficiency. Heybeli Marine protects your vessel’s performance with:
- Strict OEM Interchangeability: Our 24550-031150 bushes are manufactured to meet the exact hardness and dimensional tolerances required for the Yanmar 6N18.
- Global Strategic Logistics: We maintain a ready-to-ship inventory of these critical wear parts, ensuring they reach your vessel or shipyard quickly to avoid maintenance delays.
- Quality Assurance: Every batch undergoes dimensional verification and bond-strength testing to ensure the liner will not delaminate under heavy-duty maritime conditions.
- Complete Overhaul Support: We provide these bushings alongside rocker shafts, springs, and valves to help you conduct a professional, total top-end rebuild.
Technical Maintenance Note:
When installing the 24550-031150, it is vital to use an appropriate press tool that applies force evenly across the entire surface of the bush to prevent distortion or cracking. Ensure the housing bore is perfectly clean and free of burrs. During the overhaul, always check the shaft for scoring or signs of wear; even a perfect new bushing will fail prematurely if the mating shaft surface is rough or undersized. We recommend lightly coating the outer surface of the bush with a suitable retaining compound if specified in the Yanmar service manual to ensure it remains locked in the housing.