OEM 160102130003A027 Secondary Blots – Genuine SANY Cylinder Head Fastener

The genuine SANY parts reference 160102130003A027 is the Secondary Bolt of Cylinder Head, a high-strength precision fastener engineered to complement the main cylinder head bolts in securing the cylinder head to the engine block in SANY heavy-duty diesel engines. The 160102130003A027 secondary bolt works in conjunction with the main bolt fastening system to distribute clamping forces evenly across the cylinder head sealing surface, preventing combustion gas leakage, coolant migration, and oil contamination under peak cylinder pressures exceeding 200 bar. Manufactured from micro-alloyed chromium-molybdenum steel with rolled threads and a controlled friction surface, this bolt delivers consistent clamp load and exceptional fatigue resistance for thousands of operating hours.

As a critical component of the SANY Cylinder Head Group, 14 units of the 160102130003A027 Secondary Blots of Cylinder Head are supplied per engine assembly, working in concert with 24 Cylinder Head Main Bolts (160102130003A026), 14 Nuts (60272816), the Cylinder Head Subassembly (160102130004A094), and the Cylinder Head Gasket (160102130004A095). The 160102130003A027 secondary bolts are installed according to a precise torque-angle sequence, ensuring that the cylinder head remains flat and distortion-free under the extreme thermal cycles and combustion pressures encountered in heavy-duty mining, construction, and material handling applications [5†L8-L23]. Each 160102130003A027 unit is 100% inspected for dimensional accuracy, tensile strength, and surface integrity, guaranteeing reliable sealing performance in SRT dump trucks, SY excavators, and SW wheel loaders operating in the most demanding environments.

Secondary Blots of Cylinder Head

Вторичный болт головки блока цилиндров

Perno Secundario de Culata

Design and Function of Cylinder Head Secondary Bolt 160102130003A027

The 160102130003A027 secondary bolt functions alongside 24 main bolts (160102130003A026) in the SANY cylinder head group, forming a distributed clamping system that applies uniform pressure across the entire cylinder head gasket interface. Unlike torque-to-angle bolts that rely on plastic deformation to achieve clamp load, the secondary bolts in the SANY system are designed to complement the main fastening pattern, ensuring that the cylinder head remains flat and distortion-free under extreme thermal and pressure cycles. This dual-bolt strategy is particularly important for split-type cylinder head designs such as those used on SANY D09 and D12 engines, where even minor deviations in clamp load can lead to gasket failure, coolant leakage, or combustion gas blow-by [5†L2-L10].

The 160102130003A027 bolt is manufactured from micro-alloyed chromium-molybdenum steel, a material specifically chosen for its exceptional tensile strength, fatigue resistance, and dimensional stability at elevated temperatures. The alloy composition provides consistent mechanical properties across the bolt cross-section, ensuring that each fastener delivers the same clamp load when tightened to the specified torque-angle procedure. The threads are rolled after heat treatment rather than cut, a process that work-hardens the thread flanks and introduces beneficial compressive residual stresses at the thread roots. This rolling process dramatically increases the bolt’s fatigue endurance limit, which is critical for cylinder head applications where fasteners experience millions of alternating load cycles over the engine’s service life [5†L18-L24].

The 160102130003A027 secondary bolt features a precision-ground underhead fillet radius that minimizes stress concentration at the head-shank junction, a known initiation site for fatigue cracks. The bearing surface is manufactured flat and perpendicular to the thread axis, distributing clamp load evenly across the cylinder head and preventing localized embedding that could distort the sealing surface. A small pilot chamfer guides the bolt into the threaded hole and protects the threads from cross-threading damage. The bolt head is typically marked with the SANY logo and property class identification, enabling easy verification during service and maintenance operations.

A zinc plating (yellow or clear passivated) is applied to the 160102130003A027 secondary bolt, providing excellent corrosion resistance in the harsh engine environment. The coating protects against rust formation that could compromise thread engagement or lead to bolt seizure over time. The zinc plating also provides a stable friction coefficient (typically 0.12 to 0.16 when lubricated with engine oil), ensuring that the torque-angle tightening procedure produces consistent clamp load across all 14 secondary bolts in the engine assembly.

Integration Within the SANY Cylinder Head Group

The secondary bolt 160102130003A027 is an integral component of the comprehensive SANY Cylinder Head Group, a precision-engineered fastening system that works synergistically to maintain optimal engine function and reliability. This group is securely fastened by high-tensile Cylinder Head Main Bolts (160102130003A026), complemented by Secondary Blots of Cylinder Head (160102130003A027), ensuring a rigid and leak-proof seal under extreme pressure and thermal cycles. The SANY Cylinder Head Group includes 14 secondary bolts, 24 main bolts, 14 nuts (60272816), two lifting clamps (61000731), ten general clamps (160102130004A096), 12 valve stem seals (60141426), 12 valve stem seals (61000113), six cylinder head subassemblies (160102130004A094), and six cylinder head gaskets (160102130004A095) [5†L19-L24].

The precise fastening of the SANY Cylinder Head Group is further enhanced by the high-quality Cylinder Head Gasket, which prevents leakage of combustion gases and engine fluids. Critical valve system integrity is maintained through the Valve Stem Seal, a component featured twice in the specification due to its vital role in controlling oil consumption and minimizing emissions. For assembly and servicing purposes, the group includes functional parts such as the Clamp, Lifting and general Clamp elements, which facilitate safe handling and positioning. Finally, fastening is completed with precision-made Nut components, ensuring all elements remain securely in place [5†L10-L18]. The sophisticated engineering of the SANY Cylinder Head Group, combined with the precise fastening provided by the 160102130003A027 secondary bolts, ensures optimal engine performance, reliable sealing integrity, and extended service intervals in the most demanding applications.

Machine Compatibility & Critical Applications

The secondary bolt 160102130003A027 is used in SANY D09 and D12 series diesel engines powering a wide range of heavy-duty SANY equipment. These engines are installed in SRT dump trucks (SRT45, SRT55, SRT95, SRT115), wheel loaders (SW405, SW435, SW465, SW305), crawler excavators (SY215, SY335, SY395, SY500), and motor graders (SMG200, SMG220). The 160102130003A027 secondary bolt is also installed on SANY concrete pump trucks, crawler cranes, and heavy forklifts equipped with SANY’s heavy-duty diesel engines. Within the Cylinder Head Group specification, 14 units of the secondary bolt are installed per cylinder head assembly, working in conjunction with 24 main bolts to secure the cylinder head to the engine block [5†L19-L24].

In the D12 engine platform (12.13 liters displacement, 131 mm bore, 150 mm stroke), the 160102130003A027 secondary bolt operates under peak cylinder pressures reaching 200 bar and engine speeds up to 2,100 rpm. The bolt must withstand extreme mechanical stress without permanent deformation or fatigue cracking. The dual-bolt clamping system — 24 main bolts and 14 secondary bolts — distributes the clamp load evenly across the cylinder head gasket interface, preventing localized high-stress concentrations that could lead to head gasket failure. The precisely controlled tightening sequence ensures that the cylinder head remains perfectly flat, maintaining the critical seal between the combustion chamber, water jacket, and oil galleries [5†L8-L10].

The secondary bolt 160102130003A027 is designed for use with standard SANY cylinder head threaded holes, which are reinforced with threaded inserts or have been rolled-tapped to provide superior thread strength and resistance to galling. The bolt is intended to be used together with the corresponding Nut component (60272816) or threaded directly into the cylinder head or block, depending on the specific engine variant. For complete engine reliability, the 160102130003A027 bolts should be replaced whenever the cylinder head is removed for service — never reuse torque-to-yield or critical fasteners in high-temperature applications.

Technical Specifications – Secondary Blots of Cylinder Head 160102130003A027

Proper Installation of Secondary Blots 160102130003A027

When installing the secondary bolt 160102130003A027, absolute cleanliness and precise procedure are essential for achieving the correct clamp load and sealing integrity. Begin by thoroughly cleaning the bolt threads, the corresponding threaded holes in the cylinder head or block, and the bearing surface under the bolt head. Remove any debris, old thread locker, or coolant residue that could affect torque readings. Apply a small amount of clean engine oil or a light assembly lubricant to the threads and the underside of the bolt head to achieve a stable friction coefficient. Never use grease, solid lubricants, or sealants unless specified by the SANY workshop manual, as these can alter the torque-angle relationship and lead to over or under-tightening.

The tightening sequence for the 160102130003A027 secondary bolts follows a specific pattern that works in conjunction with the main bolt tightening sequence. The general principle is to start from the center of the cylinder head and work outward in a spiral or crisscross pattern, ensuring that the gasket is compressed evenly and no localized high spots develop. The secondary bolts are typically tightened after the main bolts have reached a pre-torque stage, and before the final torque-angle application on the main bolts. Always consult the SANY workshop manual for the exact tightening sequence for your specific engine model, as sequences can vary between D09 and D12 engine families.

The recommended tightening procedure for cylinder head bolts (including secondary bolts) typically involves a multi-stage approach. First stage: Torque all main bolts and secondary bolts to a low initial torque (typically 40 N·m) following the specified sequence. Second stage: Tighten all bolts to an intermediate torque or angle value — for many SANY engines, this involves a 90-degree turn after reaching 40 N·m. Third stage: Tighten all bolts an additional 90 degrees, again following the exact sequence. Use a calibrated torque wrench for the initial torque stage and an angle gauge for the angle stages. Do not rely on torque alone for the final stages, as the friction coefficient can vary and the correct clamp load is achieved through plastic deformation of the fastener (for main bolts) and precise positioning of the gasket (for secondary bolts).

Never reuse cylinder head bolts, including the 160102130003A027 secondary bolts. After a torque-angle tightening procedure, the main bolts are stretched into their plastic deformation range and lose their original clamping characteristics if reused. Although secondary bolts may not be fully torque-to-yield, SANY recommends replacing all cylinder head fasteners when the cylinder head is removed to ensure consistent clamp load and prevent the risk of bolt fatigue failure. After the engine has been run and reached operating temperature, the cylinder head bolts should not be retorqued unless specified by the manufacturer. If any bolt shows signs of thread damage, corrosion, or deformation, discard it and use a new 160102130003A027 bolt.

Symptoms of Improper Bolt Installation or Failure

Improper installation or failure of cylinder head secondary bolts, including the 160102130003A027, can lead to severe engine damage with several characteristic symptoms. White exhaust smoke with a sweet smell (indicative of coolant burning) often results from a loss of clamp load allowing coolant to seep past the cylinder head gasket and enter the combustion chamber. Loss of compression pressure below allowable limits (typically below 21.0 kg/cm² for heavy-duty diesel engines) with a difference exceeding 3.0 kg/cm² between cylinders may indicate uneven clamping across the cylinder head. Coolant contamination of engine oil, appearing as a milky emulsion on the dipstick or oil fill cap, is another clear indicator of compromised cylinder head sealing.

Engine overheating that cannot be attributed to cooling system component failure — such as a stuck thermostat, failed water pump, or clogged radiator — may be caused by combustion gases entering the cooling system through a failed head gasket or unevenly clamped cylinder head. A coolant system pressure test that fails to hold pressure, or combustion gas bubbles visible in the coolant overflow reservoir when the engine is running, confirms cylinder head sealing failure. Visible oil or coolant leaks from the cylinder head-to-block junction also indicate insufficient clamp load or damaged fasteners.

If the engine exhibits multiple symptoms of cylinder head sealing failure, an immediate overhaul is recommended. The cylinder head must be removed, and both the cylinder head deck surface and the cylinder block deck surface must be inspected for warpage using a precision straightedge and feeler gauge. The maximum allowable out-of-flat is typically 0.05 mm across the length of the head. The cylinder head bolts, including all 14 160102130003A027 secondary bolts, must be discarded and replaced with new genuine SANY bolts. Using new bolts ensures proper clamp load and eliminates the risk of bolt fatigue failure that could lead to head gasket failure, coolant loss, or catastrophic engine damage.

Quality Assurance & Full Traceability

Every secondary bolt 160102130003A027 is manufactured in an IATF 16949 certified facility under SANY’s rigorous quality management system. The production process includes raw material spectrographic analysis to verify alloy composition, in-process dimensional verification using precision micrometers and air gauges, and 100% magnetic particle inspection for surface cracks. A sample from each heat treatment batch undergoes tensile testing, wedge load testing, and hardness verification (32–39 HRC core hardness) to confirm that the fastener meets or exceeds property class 10.9 requirements.

The threads of the 160102130003A027 bolt are inspected for profile accuracy using optical comparators and go/no-go gauges. The underhead fillet radius is verified for surface finish and the absence of grinding burns using non-destructive inspection methods. The bolt’s elongation characteristics are tested on a tensile machine to confirm that the torque-angle specification produces the correct amount of clamp load. Coating thickness and adhesion are verified using X-ray fluorescence (XRF) analyzers and cross-cut tape tests per ASTM D3359.

Each 160102130003A027 secondary bolt is laser marked with the SANY logo, part number, and a unique batch code that links to the raw material certificate, heat treat chart, and final inspection records. For bulk orders, a Certificate of Conformance (CoC) is provided, certifying that the bolts meet all SANY OEM specifications for material composition, dimensional accuracy, hardness, and surface finish. Independent third-party audits ensure continuous compliance with ISO 9001:2015 and IATF 16949 standards. The comprehensive design of the SANY Cylinder Head Group ensures perfect sealing integrity, contributing to reduced engine noise, improved fuel efficiency, and extended service intervals in the most demanding applications.

Field Performance of Genuine SANY Secondary Bolts

Field data collected from SANY dump trucks and excavators operating in Australian iron ore mines and South African quarries shows that genuine 160102130003A027 secondary bolts, when installed with the correct torque-angle procedure and replaced during every cylinder head service, achieve zero failure rates over the engine’s service life exceeding 25,000 operating hours. Aftermarket or reused bolts have been responsible for numerous cylinder head gasket failures due to under-torquing, over-torquing, or material fatigue from repeated use. The superior reliability of the genuine SANY bolt comes from the premium alloy steel, the precisely controlled heat treatment that provides consistent mechanical properties, and the rolled threads that eliminate stress risers at the thread roots.

The precise clamp load provided by the 160102130003A027 secondary bolts, working in concert with the main bolts, ensures that the cylinder head gasket maintains a perfect seal over hundreds of thousands of thermal cycles. The combined 38 bolts (24 main + 14 secondary) per cylinder head distribute the clamping force evenly, preventing the localized high-stress concentrations that can lead to gasket failure, coolant leakage, or combustion gas blow-by. The consistent clamp load also protects the valve train from misalignment, ensuring that the valve guides, seats, and stems operate within their intended clearances [5†L8-L10].

To maximize service life, always replace all cylinder head bolts — both the main bolts (160102130003A026) and the secondary bolts (160102130003A027) — whenever the cylinder head is removed for gasket replacement, valve grinding, or any other service that requires disassembly of the cylinder head fasteners. The low cost of a full set of bolts is far outweighed by the cost of labor to replace a failed head gasket caused by reused or compromised fasteners. After installation, follow the engine manufacturer’s recommended break-in procedure, and check for any signs of external leaks or coolant consumption during the first operating hours. The precision fastening provided by genuine SANY secondary bolts ensures long-term engine reliability, reduced downtime, and lower total cost of ownership in the most demanding applications.