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Discover the high-precision BY61200040452 Cylinder Head Main Bolt, the fundamental fastening component that guarantees the structural integrity of your SHACMAN truck’s engine. This genuine OEM bolt is engineered to withstand the extreme forces within the combustion chamber, creating a perfect, permanent seal between the cylinder head and engine block. As a trusted supplier of Shacman truck parts, we understand that engine reliability starts from its core.
The BY61200040452 bolt is manufactured from ultra-high-strength, heat-treated alloy steel to exact SHACMAN tolerances. Its precise thread design, tensile strength, and elongation characteristics are calibrated to deliver the exact clamping force required for a lifetime of leak-free operation. Using the authentic BY61200040452 is non-negotiable for any engine rebuild, head gasket replacement, or major overhaul, ensuring your SHACMAN engine delivers maximum power, efficiency, and durability under the most demanding conditions.
Cylinder Head Main Bolt
Коренной болт головки блока цилиндров
Ultra-High-Strength Alloy Steel: The BY61200040452 bolt is forged from premium, heat-treated alloy steel (e.g., SAE 4340 or equivalent), providing exceptional tensile strength (typically 180,000+ PSI) and resistance to fatigue and stretching under extreme thermal and combustion pressures.
Precision Rolled Threads & Shoulder Design: Features precision-rolled threads for superior strength and a precisely machined shoulder for accurate seating and consistent clamping force distribution, ensuring even load across the cylinder head and block deck.
Torque-to-Yield (TTY) Engineering: Engineered as a Torque-to-Yield bolt, the BY61200040452 is designed to be tightened to a specific torque and then a precise angle, permanently stretching within its elastic limit to achieve a uniform, reliable, and maintenance-free clamp load that withstands thermal cycling.
Advanced Anti-Friction & Corrosion Coating: Treated with a specialized micro-thin coating (e.g., zinc flake, phosphate, or polymer) to reduce friction during installation for accurate torque reading and to provide excellent resistance to corrosion from coolant and engine oils.
The table below details the critical technical specifications for the BY61200040452 Cylinder Head Main Bolt. This data is essential for ensuring correct application and installation in your SHACMAN engine.
| Parameter | Value / Description |
|---|---|
| OEM Part Number | BY61200040452 |
| Product Name | Cylinder Head Main Bolt |
| Brand | SHACMAN |
| Material | Heat-Treated Alloy Steel (SAE 4340 or equivalent) |
| Tensile Strength | > 1240 MPa (180,000 PSI) |
| Yield Strength | > 1100 MPa (160,000 PSI) |
| Thread Size & Pitch | M14 x 2.0 mm (Example – Application Specific) |
| Overall Length | 180 mm (Varies by engine model) |
| Shoulder Diameter/Length | Precisely machined to engine specifications |
| Fastener Type | Torque-to-Yield (TTY) / Angular Torque |
| Surface Treatment | Zinc Flake Coating (Dacrocoat) or Phosphate/Oil |
| Installation Method | Follow SHACMAN service manual (e.g., Torque + Angle sequence) |
| Reusability | Not reusable after TTY installation; must be replaced with new BY61200040452 |
| Primary Application | Clamping cylinder head to engine block on SHACMAN diesel engines (e.g., WP10, WP12 series) |
Warning: Always use the exact torque and angle sequence specified in the SHACMAN service manual for the BY61200040452. Using incorrect procedures or reusing TTY bolts can cause engine failure.
The BY61200040452 Cylinder Head Main Bolt is the most critical fastener in the entire engine assembly. Its sole purpose is to create and maintain the clamping force that seals the cylinder head to the engine block.
This seal contains the immense pressures of combustion (exceeding 2000 PSI), prevents leakage of combustion gases into coolant passages, and stops coolant and oil from mixing or leaking externally.
The BY61200040452 works in conjunction with the cylinder head gasket. The uniform clamping force provided by a full set of these bolts ensures the gasket compresses evenly across the entire sealing surface.
Uneven clamping, caused by incorrect bolts or improper installation, leads to head gasket failure, coolant loss, engine overheating, and catastrophic damage like warped heads or cracked blocks.
As a Torque-to-Yield bolt, the BY61200040452 is designed to be stretched to a precise point within its elastic limit. This controlled stretching provides a more consistent and reliable clamp load than a standard bolt tightened to a simple torque value.
The performance of the BY61200040452 directly impacts engine power, fuel efficiency, emissions, and long-term reliability. It is a consumable component during any engine rebuild and must always be replaced with a new, genuine part.
1. Clean all bolt holes in the engine block thoroughly using a thread chaser. Ensure no debris, oil, or old thread locker remains. Wipe the threads of the new BY61200040452 bolts with a clean cloth.
2. Lightly lubricate the bolt threads and underside of the bolt head ONLY with the lubricant specified in the service manual (often engine oil or a specific moly paste). Do not over-lubricate.
3. Place the cylinder head gasket and head onto the block. Hand-thread all BY61200040452 bolts to ensure they are not cross-threaded.
4. Using a calibrated torque wrench, tighten all bolts in the manufacturer’s specified sequence to an initial torque value (e.g., 50 Nm).
5. In the same sequence, tighten all bolts again to a final torque value (e.g., 100 Nm).
6. Finally, using an angle torque gauge, turn each bolt in the specified sequence by the exact angle (e.g., 90 degrees). This is the yield stage.
7. Do not perform any additional tightening. The BY61200040452 bolts are now correctly tensioned. Proceed with the rest of the assembly.
• NEVER REUSE TTY BOLTS: The BY61200040452 is a one-time-use fastener. Once torqued to yield, its metallurgical properties are altered. Reuse will not provide the correct clamp load and will likely lead to failure.
• Always replace the entire set of cylinder head bolts when servicing the head. Mixing old and new bolts is unacceptable.
• Always follow the exact tightening sequence provided by SHACMAN. This sequence is designed to clamp the head evenly and prevent warping.
• Use only the specified lubricant. Incorrect lubrication changes the friction coefficient, leading to incorrect clamp load (too high or too low).
• After installation, these bolts do not require re-torquing. The TTY method provides a permanent, stable clamp load.
• Keep a detailed service record, noting the use of genuine BY61200040452 bolts and the installation procedure followed.
Warning: Deviation from the specified procedure for the BY61200040452 can result in immediate or latent engine failure, including blown head gaskets, coolant contamination, and severe mechanical damage. Precision is paramount.
Choosing the genuine BY61200040452 bolt is a critical decision that affects the entire engine’s lifespan. SHACMAN engineers these bolts with exact material properties, dimensions, and coatings.
Aftermarket bolts may have similar thread size but often differ in steel grade, heat treatment, tensile strength, or coating. These differences can lead to under-torquing, over-torquing, premature stretching, or breakage.
The genuine BY61200040452 undergoes rigorous batch testing for hardness, tensile strength, fatigue life, and coating uniformity. This ensures every bolt in the set behaves identically, creating even clamping force.
The specialized coating on the BY61200040452 is designed for a specific friction coefficient. This is essential for the torque-to-angle tightening method to work correctly and achieve the designed clamp load.
Using non-genuine bolts voids any related engine warranty and poses an extreme risk of catastrophic failure. For the engine’s most critical fasteners, only the authentic BY61200040452 provides the required assurance.
Master engine builders universally insist on using only genuine TTY bolts like the BY61200040452. They report consistent installation feel and peace of mind knowing the clamp load is correct.
Fleet maintenance managers have documented a drastic reduction in come-back repairs for head gasket issues after mandating the use of genuine SHACMAN fasteners, including the BY61200040452, in all overhauls.
This reliability translates into hundreds of thousands of kilometers of trouble-free operation for engines. The precision of the BY61200040452 eliminates variables during assembly, leading to predictable and successful engine rebuilds.
Workshops that standardize on the BY61200040452 build a reputation for quality and durability, attracting more business from owner-operators and fleets alike.
The BY61200040452 plays a hidden but crucial role in environmental protection. By ensuring a perfect cylinder head seal, it maintains optimal combustion chamber integrity.
This prevents blow-by of combustion gases, helps the engine run at peak efficiency, and minimizes harmful exhaust emissions over its operational life.
A failure of this component often leads to coolant contamination with oil or vice versa, generating hazardous waste that is difficult and expensive to dispose of properly.
From a safety standpoint, a failed cylinder head bolt can cause sudden and total loss of engine coolant while driving, leading to immediate overheating.
This can result in engine seizure, a sudden loss of vehicle power, and potentially cause a dangerous roadside situation or accident. The BY61200040452 is a safety-critical component.
Every production run of the BY61200040452 is subject to exhaustive quality control. This includes spectrographic material analysis, Rockwell hardness testing, full-dimension inspection, and salt spray testing for corrosion resistance.
As an authentic SHACMAN component, the BY61200040452 is backed by the manufacturer’s warranty, providing assurance against defects in material and workmanship.
Purchasing from authorized distributors guarantees you receive genuine BY61200040452 bolts with full traceability. This protects your significant investment in an engine overhaul.
Counterfeit or substandard bolts carry no such assurances and represent an enormous financial risk. The cost of a failed engine far outweighs the savings from using non-genuine fasteners.
While the BY61200040452 is a consumable part, its cost is a minor fraction of a complete engine rebuild. It is the insurance policy for that rebuild.
Using genuine bolts ensures the repair is done correctly the first time, eliminating costly comebacks, secondary damage, and customer dissatisfaction.
For fleet operators, the extended engine life and reliability achieved with genuine components like the BY61200040452 maximize vehicle uptime and resale value.
The peace of mind knowing that the engine’s core is fastened with the correct component is invaluable for both mechanics and vehicle owners.
The BY61200040452 is specifically designed for certain SHACMAN engine families. Using it in an incompatible engine can have disastrous results.
Always verify the part number using your engine’s model number, serial number, or the vehicle VIN via an official SHACMAN parts catalog.
Length, thread pitch, shoulder design, and tensile strength are all application-specific. A bolt from a different engine will not perform correctly.
Never substitute a standard hex bolt for a TTY bolt like the BY61200040452. The engineering principles are completely different.
The BY61200040452 Cylinder Head Main Bolt is not just a fastener; it is the guarantor of your engine’s sealing, power, and longevity. Its role is fundamental and unforgiving of compromise.
Choosing the genuine BY61200040452 is the definitive choice for quality, safety, and performance. Trust SHACMAN engineering to provide the critical link that holds your engine’s power together.
For your next engine rebuild, overhaul, or repair, insist on the authentic BY61200040452 Cylinder Head Main Bolt. Secure your investment, ensure peak performance, and drive with the confidence that comes from a perfectly sealed engine.
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