- ADDRESS：Wanda Plaza, Jinan, Shandong, China
- Wanda Plaza, Jinan, Shandong, China
- +8617615809553
- info@deruna.com
Discover the engineered heart of the valvetrain with the BY612630050018 Rocker Arm Shaft Assembly, an essential OEM component for SHACMAN diesel engines. This critical assembly serves as the central rotating axis and structural backbone for the rocker arms, ensuring precise transfer of motion from the camshaft to the engine valves. For mechanics and fleet managers seeking reliable and durable Shacman truck parts, the integrity of the BY612630050018 is paramount for maintaining optimal engine timing, compression, and power.
Manufactured to SHACMAN’s exacting specifications, this genuine assembly guarantees perfect dimensional stability and material strength. Its role is to provide a smooth, low-friction pivot point while withstanding continuous high-load cycles. Understanding the function of the BY612630050018 assembly is crucial for effective engine maintenance, performance tuning, and preventing costly valvetrain failures in demanding heavy-duty operations.
Rocker Arm Shaft Assembly
Ос коромысла в сборе
High-Strength Hollow Steel Shaft: The BY612630050018 assembly features a precision-ground, high-tensile strength hollow steel shaft, providing maximum rigidity with reduced weight, ensuring minimal deflection under high valve spring pressures.
Integrated Oil Passage System: Engineered with internal oil galleries and strategically placed external feed holes, it delivers pressurized engine oil directly to each rocker arm bushing for consistent lubrication and heat dissipation.
Wear-Resistant Bearing Surfaces: The shaft surfaces that contact the rocker arm bushings are hardened and polished to an ultra-smooth finish, drastically reducing friction and wear for extended service life.
Precision End Plugs and Mounting Provisions: Includes sealed end plugs to contain oil pressure and features precise mounting points for secure attachment to the rocker arm support, preventing axial movement.
The table below details the technical specifications for the BY612630050018 Rocker Arm Shaft Assembly. This data is crucial for verifying compatibility and ensuring correct valvetrain assembly.
| Parameter | Value / Description |
|---|---|
| OEM Part Number | BY612630050018 |
| Product Name | Rocker Arm Shaft Assembly |
| Brand | SHACMAN |
| Shaft Material | Chrome-Molybdenum Alloy Steel (e.g., 4140) |
| Shaft Diameter | 25 mm (Application Specific) |
| Shaft Length | Cylinder Head Length (e.g., for 6-cylinder bank) |
| Surface Hardness | 55-60 HRC (Induction Hardened) |
| Oil Hole Diameter | Precision drilled to match lubrication system flow |
| Finish | Precision Ground and Polished |
| Assembly Includes | Shaft, end plugs, sealing washers (as per design) |
| Compatible Engine Series | SHACMAN WP10, WP12, and other inline-6 diesel engines |
Always verify BY612630050018 compatibility with your specific SHACMAN engine model using your Vehicle Identification Number (VIN) or official technical documentation.
The BY612630050018 Rocker Arm Shaft Assembly is the central rotating component within the rocker arm assembly on SHACMAN cylinder heads. It is installed through the bores of the rocker arm support.
Individual rocker arms are mounted on this shaft, typically separated by spacers or springs. The shaft acts as a fixed pivot point, allowing the rocker arms to rotate back and forth.
This rotation converts the upward push from the pushrods (or directly from the camshaft in some designs) into a downward force to open the engine valves. The BY612630050018 must maintain perfect alignment.
Its internal oil passages are critical. They feed oil to each rocker arm bushing, ensuring a hydrodynamic film that prevents metal-to-metal contact and carries away heat.
A straight, unworn shaft is essential for maintaining correct valve timing and lift. Any bend or wear in the BY612630050018 can lead to uneven valve operation, power loss, and accelerated wear.
This assembly is fundamental to engine efficiency and is a key component inspected during any major engine overhaul or cylinder head rebuild on SHACMAN powerplants.
1. Ensure the cylinder head and rocker arm support are clean, with all oil passages clear. Verify all rocker arm bushings are in good condition.
2. Lightly lubricate the entire length of the new BY612630050018 shaft with clean engine oil before installation.
3. Carefully insert the shaft through the rocker arm support and the rocker arms, aligning the oil feed holes in the shaft with the corresponding ports in the support.
4. Install any spacers or springs between the rocker arms in the correct order as per the service manual.
5. Secure the shaft in place using the provided end plugs, bolts, or retaining clips. Ensure they are torqued to specification.
6. After assembly, manually rotate each rocker arm to confirm smooth, free movement on the BY612630050018 shaft without binding.
7. Prime the engine oil system before initial startup to ensure immediate lubrication flows through the shaft’s internal galleries.
• During valve lash adjustments, check for any visible scoring or discoloration (bluing) on the exposed surfaces of the BY612630050018 shaft, indicating oil starvation or excessive heat.
• Feel for any up-and-down play in the rocker arms on the shaft, which would suggest wear in either the shaft or the rocker arm bushings.
• Listen for persistent valvetrain tapping that doesn’t resolve with lash adjustment, which can point to worn shaft or bushing surfaces.
• When the cylinder head is removed, use a micrometer to measure the shaft diameter at multiple points to check for wear or ovality beyond service limits.
• Inspect the internal oil passages of the BY612630050018 for any blockage using compressed air or a suitable probe.
• Regular oil changes with the correct grade and quality of oil are the best preventive maintenance for the longevity of this assembly.
Proper alignment during installation is non-negotiable. Forcing the shaft can damage the precision bores in the support and lead to immediate lubrication failure and catastrophic wear.
Choosing the genuine BY612630050018 assembly guarantees the metallurgical properties, hardness profile, and dimensional precision required for a high-speed, high-load valvetrain component.
Aftermarket shafts may be made from inferior steel, lack proper hardening, or have inaccurately drilled oil passages. This can lead to rapid wear, shaft bending, and oil starvation to the rocker arms.
The genuine BY612630050018 undergoes rigorous quality control for straightness, surface finish, hardness, and oil passage integrity. It ensures perfect oil flow and friction characteristics.
Using the authentic assembly preserves the designed performance and durability of the entire valvetrain. It is also essential for maintaining any applicable engine warranty coverage.
Engine rebuilders consistently report that the genuine BY612630050018 shaft slides smoothly into the support without binding, a sign of perfect tolerance control that saves time and ensures correct assembly.
Fleet technicians note that engines equipped with OEM valvetrain components like the BY612630050018 maintain stable valve lash settings for longer intervals, indicating superior wear resistance.
The reliability of the internal oiling system in the BY612630050018 is highly praised. It ensures even rocker arm lubrication, preventing the premature failure of specific cylinders.
High-mileage operators observe that using genuine shafts contributes to consistent engine power output and fuel efficiency over the long term, validating its durability and design integrity.
A properly functioning BY612630050018 contributes to precise valve timing, which is critical for efficient combustion. This helps minimize fuel consumption and reduce harmful exhaust emissions.
Its long service life reduces the frequency of replacement, contributing to resource conservation and less waste generated from maintenance activities.
From a safety perspective, a failed rocker arm shaft can cause immediate and severe engine damage. Valves may not open or close correctly, potentially leading to piston-to-valve contact and engine seizure.
Using the reliable, genuine BY612630050018 mitigates this risk, ensuring vehicle reliability and preventing dangerous roadside breakdowns, especially under load.
Each BY612630050018 Rocker Arm Shaft Assembly is manufactured under strict quality protocols. This includes material certification, hardness testing, straightness verification, and pressure testing of oil passages.
As an official SHACMAN component, the BY612630050018 is backed by the manufacturer’s standard parts warranty, providing assurance against defects in materials and workmanship.
Purchasing from authorized distributors is the only way to guarantee this warranty protection and to be certain you have received a genuine, specification-compliant component.
This assurance is invaluable for commercial operations that require predictable repair outcomes and must manage operational risks associated with component failure.
The initial investment in the genuine BY612630050018 pays significant dividends by preventing catastrophic engine damage. A failed shaft can destroy rocker arms, pushrods, valves, and pistons.
Its precise fit and reliable lubrication eliminate labor associated with diagnosing and repairing valvetrain problems caused by inferior parts, such as uneven wear or oil starvation.
Standardizing on the OEM BY612630050018 across a fleet ensures consistent engine performance and maintenance intervals, simplifying logistics and parts inventory.
Ultimately, this component is a strategic investment in engine longevity and total cost of ownership, maximizing vehicle uptime and protecting the major asset that is the engine.
The BY612630050018 assembly is engineered for specific SHACMAN engine families and cylinder head designs. Fitment is determined by engine model, displacement, and production year.
Variations exist in shaft length, diameter, oil hole placement, and end fitting design. Using the exact OEM number BY612630050018 is therefore absolutely critical.
Always confirm fitment by cross-referencing the part number with your engine’s serial number or VIN through official SHACMAN parts catalogs or authorized dealers.
Correct fitment ensures the oil supply aligns perfectly and the shaft provides the correct geometry for all rocker arms, which is fundamental to engine performance and longevity.
The BY612630050018 Rocker Arm Shaft Assembly is the unsung hero of your SHACMAN engine’s valvetrain, providing the smooth, reliable pivot essential for power and efficiency.
Choosing the genuine BY612630050018 is a direct investment in valvetrain harmony, durability, and consistent performance under the most demanding conditions.
For your next engine overhaul or cylinder head service, insist on the authentic SHACMAN BY612630050018 Rocker Arm Shaft Assembly. Ensure precise valve actuation, protect your engine from costly damage, and drive with the confidence of OEM engineering.
We are a first-class heavy duty vehicles and spare parts supplier in China. which covers from engine, gearbox, cab, axle assemblies to main assembly accessories, electrical parts and other chassis parts like brake, clutch and steering parts.
A PROFESSIONAL CHINA TRUCK AND SPARE PARTS SUPPLIER
@Copyright DERUNA
