Adjusting Bolt
Регулировочный болт
Perno de ajuste
The OEM Adjusting Bolt 612630050027 is a precision-manufactured valve lash adjustment component engineered exclusively for the Shacman X5000 heavy-duty diesel engine. This critical threaded fastener is installed in the rocker arm and provides the precise mechanical interface that sets and maintains the correct running clearance between the rocker arm tip and the valve stem or push rod socket.
Fabricated from high-grade hardened alloy steel with a precision-ground spherical ball end and rolled threads, the adjusting bolt delivers exceptional wear resistance and maintains its set position under the constant hammering loads of valvetrain operation. The 612630050027 part features a hardened tip that resists brinelling and ensures consistent valve lash over extended service intervals.
Selecting genuine OEM adjusting bolts preserves the precise valve timing events and prevents the performance loss caused by improperly set or drifting valve clearances. The 612630050027 identifier provides complete traceability to Shacman’s stringent material specifications and dimensional inspection protocols for critical valvetrain adjustment components.
| Parameter | Specification | Details |
|---|---|---|
| OEM Part Number | 612630050027 | Unique Shacman X5000 identifier |
| Product Name | Adjusting Bolt | Valve lash adjuster screw |
| Brand / Engine Model | Shacman X5000 | Heavy-duty diesel engine series |
| Material | Hardened Alloy Steel | High wear resistance and strength |
| Thread Type | Fine pitch rolled threads | Precise adjustment and secure locking |
| Tip Configuration | Hardened spherical ball end | Smooth contact with push rod socket |
| Tip Hardness | HRC 55-60 | Resists brinelling and deformation |
| Locking Mechanism | Lock nut (jam nut) design | Maintains set clearance securely |
| Application | Intake and exhaust rocker arms | Sets valve lash clearance |
| Packaging | Protective oiled wrapping | Shacman genuine labeled packaging |
The fine-pitch threads allow the technician to set valve lash with extreme precision. Each incremental turn of the bolt translates into a tiny linear movement, enabling the exact clearance specified by Shacman.
Once the correct clearance is set, the lock nut is tightened against the rocker arm body. The 612630050027 bolt’s thread design and hardened surfaces ensure this setting remains stable under high-frequency vibration.
The polished ball end articulates smoothly within the push rod socket as the rocker arm cycles. This spherical interface accommodates the arcing motion of the rocker arm without inducing side loads on the push rod.
The adjusting bolt 612630050027 is threaded into the rocker arm of the Shacman X5000 engine. To set the valve lash, the engine is positioned so that the camshaft lobe for the cylinder being adjusted is on its base circle. The lock nut is loosened, and a feeler gauge of the specified thickness is inserted between the rocker arm pad and the valve stem tip or between the adjusting bolt ball end and the push rod socket. The adjusting bolt is turned with a suitable wrench until a slight drag is felt on the feeler gauge. While holding the adjusting bolt stationary to prevent it from turning, the lock nut is torqued to the factory specification. After tightening, the clearance is rechecked with the feeler gauge to confirm the setting has not changed. This procedure is repeated for each cylinder according to the engine’s firing order to ensure consistent valve timing across all cylinders.
Each adjusting bolt produced under OEM number 612630050027 begins as a certified alloy steel blank. The threads are formed using a precision rolling process that compresses the grain structure of the steel, resulting in threads that are significantly stronger and more fatigue-resistant than cut threads. The spherical ball end is cold-formed and then precision-ground to achieve the exact radius and an exceptionally smooth surface finish required for long-term wear resistance.
After forming, the ball end undergoes a localized induction hardening process that creates a deep, wear-resistant case while the threaded portion and body retain a tougher, more ductile core. The driving feature, typically a hex or Allen socket, is precisely broached to ensure reliable wrench engagement. Each bolt is inspected for thread pitch accuracy, ball end radius and surface finish, and overall dimensional conformity. The completed bolts are preserved with a light rust-preventive oil and individually packaged in sealed bags placed inside Shacman branded boxes marked with the 612630050027 part number.
Adjusting bolts should be carefully inspected whenever the valve lash is checked or the rocker arm assembly is removed for service. Technicians must examine the spherical ball end for any signs of pitting, scoring, or flattening. A worn or damaged ball end will not articulate smoothly in the push rod socket, causing accelerated wear on both components and potentially altering the effective valve lash during operation.
The threads should be checked for any evidence of stretching, galling, or corrosion that could compromise the locking ability of the jam nut. If the adjusting bolt requires repeated readjustment due to clearance drift, it often indicates thread wear or ball end deterioration. In such cases, the bolt and the corresponding lock nut must be replaced with new 612630050027 components to restore the engine’s ability to maintain accurate and stable valve lash settings across extended service intervals.
Procuring the authentic adjusting bolt for your Shacman X5000 valvetrain service is a simple and efficient process. Use the inquiry button above to confirm current stock availability and request a tailored quotation. We maintain comprehensive inventory of these essential adjustment components to support both individual engine tune-ups and complete fleet valve lash maintenance programs worldwide.
To guarantee you receive the exact factory-specified component, always reference the OEM part number 612630050027 in your purchase order. Our logistics team provides all necessary export documentation and certificates of conformity with every international shipment for efficient customs processing and inventory verification at your facility.
Ready for Immediate Dispatch
Genuine Shacman stock available globally for X5000 engines.
Choosing the genuine Adjusting Bolt 612630050027 is a decision that directly impacts the precision, performance, and longevity of your Shacman X5000 engine. Aftermarket adjusting bolts manufactured from inferior steel or with improperly hardened ball ends can wear rapidly, causing valve lash settings to drift out of specification. Incorrect valve clearance leads to noisy operation, reduced engine power, increased fuel consumption, and in severe cases, burned valves or damaged camshaft lobes.
The OEM adjusting bolt’s specific ball end radius, thread pitch, and material hardness were developed through extensive engine dynamometer testing. Shacman engineers validated this design to ensure it maintains its set position under the constant high-frequency hammering transmitted from the camshaft through the push rod. The 612630050027 bolt provides the stable, precise adjustment platform that is essential for achieving the correct valve timing events that optimize engine volumetric efficiency and combustion.
Professional engine technicians and fleet maintenance managers worldwide standardize on the 612630050027 adjusting bolt for its guaranteed dimensional accuracy and proven ability to hold a precise setting. This small threaded fastener plays an absolutely vital role in the precise orchestration of the engine’s valvetrain. Trust only the adjusting bolt that Shacman engineered and certified for the demanding X5000 heavy-duty truck application.
The adjusting bolt 612630050027 operates under constant cyclic impact loading as the camshaft lobe forces the push rod upward against the rocker arm, and the valve spring forces it back down. This repetitive hammering subjects the ball end to high contact stresses. The induction-hardened surface creates a compressive residual stress layer that resists the initiation of fatigue cracks, ensuring the bolt maintains its spherical profile and smooth surface finish throughout the engine’s service life.
When performing a valve lash adjustment, it is critical to use the correct size feeler gauge and to ensure it is perfectly clean and free of burrs. A bent or damaged feeler gauge will give a false reading, leading to an incorrect clearance setting. The lock nut must be torqued correctly; under-torquing allows the bolt to loosen, while over-torquing can strip the threads or distort the rocker arm. Following the precise procedure outlined in the Shacman X5000 workshop manual is essential for achieving consistent and accurate results.
For our international customers, we package the 612630050027 adjusting bolts with the care these precision components deserve. Each bolt is individually sealed in a VCI protective bag and packed in compartmented cartons that prevent any thread damage or surface corrosion during ocean freight and extended warehouse storage. Partner with our global supply network for a reliable source of genuine Shacman valvetrain components, and maintain your fleet’s engines at peak operational efficiency, fuel economy, and reliability across every kilometer of operation.
