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The cylinder head is the heart of a diesel engine, and its secure attachment is paramount to performance, efficiency, and longevity. Among the most critical fasteners in any engine rebuild are the cylinder head bolts, and for SANY D12C4.3 series engines, the OEM part number 13465247 represents the gold standard. As a cornerstone of genuine SANY parts, the 13465247 bolt set is engineered to deliver the exact clamping force, tensile strength, and dimensional precision required for a perfect seal between the head and engine block.
Using any fastener other than the specified 13465247 during an overhaul risks catastrophic failure, including head gasket leaks, coolant intrusion, and loss of compression. For technicians and rebuilders, choosing the authentic 13465247 bolts is a non-negotiable step in ensuring a reliable, long-lasting engine repair that meets factory specifications.
Cylinder Head Bolts D12C4.3-3
Болты головки цилиндров D12C4.3-3
Pernos de Culata D12C4.3-3
Cylinder head bolts are not ordinary fasteners; they are precision-engineered components responsible for creating and maintaining the seal of the engine’s most critical joint. In the SANY D12C4.3 diesel engine, the set identified by part number 13465247 is specifically designed to withstand extreme temperatures, intense combustion pressures, and the dynamic loads of engine operation.
Their primary function is to apply a controlled, even clamping force across the cylinder head, compressing the head gasket to prevent leaks of combustion gases, engine oil, and coolant. The design of the 13465247 bolts, including their length, thread pitch, shoulder diameter, and tensile rating, is calculated to work in harmony with the cylinder head’s material and the block’s thread engagement.
Using incorrect or substandard bolts can lead to uneven clamping, which is a primary cause of head gasket failure. This can result in costly secondary damage like hydro-lock, overheating, or oil contamination. The genuine 13465247 bolts are manufactured from a specific grade of heat-treated alloy steel, providing the necessary “stretch” or elasticity to maintain tension as the engine heats up and cools down through countless cycles. For any repair involving the cylinder head on a D12C4.3 engine, the 13465247 fastener set is the only acceptable choice to guarantee a successful, durable rebuild.
The 13465247 bolts are forged from premium chromium-molybdenum or similar high-grade alloy steel. This material is chosen for its exceptional strength-to-weight ratio and its ability to retain properties at the high temperatures found in the cylinder head environment.
Threads are not cut but precision-rolled, which aligns the grain structure of the metal along the thread profile. This creates stronger, more fatigue-resistant threads with superior surface finish, ensuring smooth engagement and accurate torque readings.
These bolts are designed to act as calibrated springs. They elongate slightly (within their elastic limit) when torqued. This controlled stretch is critical for maintaining clamp load as the head gasket compresses and the engine expands and contracts with heat.
A specialized zinc or phosphate-based coating is applied to the 13465247 bolts. This protects against rust and galvanic corrosion in the presence of coolant and engine oils, ensuring easy removal during future service and preventing thread seizure.
Sold as a complete set for the engine, every 13465247 bolt within the package has identical metallurgical properties and dimensions. This consistency is vital for achieving uniform clamping force across all cylinders, which is impossible with mixed or mismatched bolts.
Every dimension—from shank length and diameter to thread pitch and underhead radius—is manufactured to the original SANY blueprint. This guarantees perfect fitment, correct thread engagement depth, and optimal load distribution in the block.
Detailed OEM specifications for the cylinder head bolt set. Specifications are for the D12C4.3 engine application.
| Parameter | Specification | Details / Unit |
|---|---|---|
| OEM Part Number | 13465247 | Primary Identification Code |
| Component Name | Cylinder Head Bolt Set | For SANY D12C4.3 Engine |
| Bolt Quantity per Set | 20 (or as per engine config) | Complete set for one engine |
| Bolt Grade / Class | 12.9 (Metric) / Grade 8 (Equivalent) | High tensile strength classification |
| Thread Size & Pitch | M12 x 1.75 (Example) | Specific to D12C4.3 block threads |
| Overall Length | 150mm – 180mm (Varies by position) | Different lengths for different holes |
| Shoulder / Shank Diameter | 12.0 mm | Precision ground |
| Head Style | Hex Flange / 12-Point | For socket or wrench engagement |
| Torque-to-Yield (TTY) Design | Yes | Requires angle tightening procedure |
| Final Tightening Torque + Angle | e.g., 90 Nm + 90° + 90° | Refer to SANY service manual |
| Surface Treatment | Zinc-Plated or Phosphate Coated | Anti-corrosion, friction-stable |
| Material | Alloy Steel 34CrMo4 or similar | Heat treated, quenched & tempered |
The cylinder head joint is one of the most stressed areas in an engine. Compromising on the fasteners that hold it together invites a range of serious and expensive failures. Understanding the risks underscores the importance of using a new, genuine 13465247 bolt set for every head installation.
The genuine SANY 13465247 bolt set is engineered to prevent all these issues. It is a consumable part designed for one-time use to guarantee a perfect, reliable seal. The cost of the bolt set is minimal compared to the labor and potential damage of a failed head gasket job.
Preparation: Ensure the cylinder block threads are clean, undamaged, and dry. Chase threads with the correct tap if necessary. Lightly oil the threads of the new 13465247 bolts with clean engine oil unless specified otherwise by the manual.
Sequence is Paramount: Always follow the manufacturer’s specified tightening sequence diagram. This is usually a spiral pattern starting from the center and working outward. This sequence ensures the head is drawn down evenly without warping.
Torque-to-Yield Procedure: Most modern engines, including the D12C4.3, use a TTY method for head bolts marked 13465247. This involves: 1) A preliminary torque pass (e.g., 40 Nm) in the correct sequence. 2) A second pass to a higher torque (e.g., 90 Nm). 3) Final tightening by rotating the bolt a specified angle (e.g., 90 degrees, then an additional 90 degrees). This angle tightening stretches the bolt to its designed yield point, ensuring precise and consistent clamp load. A calibrated angle gauge is essential.
Final Verification: After the final angle step, do not attempt to re-torque the bolts. The installation is complete.
Required Tools: A calibrated, high-quality click-type or electronic torque wrench, a reliable angle gauge (often built into advanced torque wrenches), and the correct socket (12-point or hex).
Never Reuse Old Bolts: The 13465247 bolts are designed for single use. Their metallurgy is altered during the TTY process. Discard the old bolts immediately after removal to prevent accidental reuse.
Cleanliness: The bolt holes in the block must be free of oil, coolant, or debris. Use a thread chaser and compressed air. Fluid trapped in a blind hole can hydraulic, causing false torque readings and potentially cracking the block when the bolt bottoms out.
Refer to the Manual: The exact torque and angle values for the 13465247 bolts are specific to the SANY D12C4.3 engine. Always consult the latest official SANY service manual for the definitive procedure. The values in the table above are examples; the actual specs may vary by engine serial number or production year.
Professional Recommendation: Due to the critical nature of this task, cylinder head installation and torque procedures should be performed by a trained technician familiar with SANY engines and TTY fastener protocols.
In an engine rebuild, the fasteners are the foundation of the repair. The genuine 13465247 set is your assurance of quality, performance, and safety.
SANY certifies the exact alloy and heat treatment for the 13465247 bolts, ensuring they have the correct strength and elasticity. Generic bolts may have unknown or inferior metallurgy.
These bolts are made to work precisely with the engine’s TTY tightening specs. Their elongation characteristics are calibrated to provide the designed clamp load at the specified angle.
Every bolt in the 13465247 package is identical. This uniformity is critical for achieving even clamping force across all cylinders, which is the key to a leak-free seal and long engine life.
Using the 13465247 bolts ensures your engine repair complies with SANY’s technical standards. This is often required to maintain any remaining engine warranty or for warranty on the repair work itself.
The SANY 13465247 Cylinder Head Bolts D12C4.3-3 are the definitive linchpin of a successful engine overhaul. They represent a small but absolutely critical investment in the integrity of your repair. Compromising on these fasteners jeopardizes the entire engine assembly, risking catastrophic failure and immense additional cost.
When the cylinder head comes off, the old bolts must go out, and a new, genuine 13465247 set must go in. It is the only way to ensure the rebuilt engine delivers the power, efficiency, and longevity that SANY engineering intended. Trust in the part number that carries the SANY name and guarantee.
Build with confidence. Secure with genuine SANY parts.
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