The Air compressor connecting components are the critical hardware elements that ensure the engine‑driven air compressor functions properly on the HOWO MAX 4X2 MC13 engine. These Air compressor connecting components include all the pipes, hoses, clamps, bolts, joints, and sealing washers that route intake air, cooling water, and secure the compressor assembly. When you choose authentic Howo Parts, this Air compressor connecting components kit guarantees OE fitment and leak‑free operation. Below are detailed descriptions of every component included in this Air compressor connecting components assembly.
The air inlet pipe of air compressor (Hi_SCR) is a pre‑formed steel or aluminum tube that carries filtered air from the engine air cleaner to the compressor inlet. This Air compressor connecting components pipe ensures a steady, uncontaminated air supply for the compressor, preventing dust and debris from entering the compression chamber. The Hi_SCR designation indicates compatibility with high‑efficiency SCR emission systems used on Euro 5 engines. This pipe is precisely bent to clear surrounding engine components and includes flanged ends that mate with the compressor inlet port and the air intake system.
The hexagon bolt with flange Q186 – M8X40 – 10.9 – MAN183 – B1 is a class 10.9 M8 flange bolt with 40mm length used to secure the air compressor mounting bracket or inlet pipe brackets to the engine block[reference:0]. This Air compressor connecting components bolt features an integrated flange that distributes clamping load evenly, eliminating the need for a separate washer. The 10.9 property class provides high tensile strength, and the MAN183 thread locking patch prevents loosening under vibration. Torque this Air compressor connecting components bolt to 25 Nm during installation.
One M8x70 flange bolt with class 10.9 and 70mm length is used where the Air compressor connecting components require deeper thread engagement, such as when passing through thick brackets or spacer bushings. The extra length ensures sufficient thread contact in the engine block without bottoming out. Torque this Air compressor connecting components bolt also to 25 Nm. The flange head and thread locking patch provide secure, vibration‑proof fastening.
The cooling return pipe of air compressor is a steel tube that carries engine coolant from the compressor back to the engine cooling system. This Air compressor connecting components pipe is essential for managing the thermal load of the compressor, which generates significant heat during continuous operation. The pipe is formed with a 90‑degree bend and incorporates flanged or barbed ends that accept rubber hoses secured by the supplied clamps. A properly flowing cooling return pipe ensures the compressor piston and cylinder head do not overheat, preventing carbon buildup and premature wear.
The air compressor air inlet resonance tube is a specially designed plastic or steel tube that attenuates intake noise from the compressor[reference:1]. This Air compressor connecting components tube reduces the characteristic “honking” sound often associated with air compressor operation, contributing to a quieter cab environment and reduced driver fatigue. The resonance chamber within the tube is tuned to cancel out specific noise frequencies generated by the compressor intake pulses. This component also helps smooth air flow into the compressor, improving volumetric efficiency.
The composite sealing washer is a bonded seal with an inner diameter of 26.7mm and outer diameter of 34.9mm, made from a steel outer ring with an FPM rubber sealing element[reference:2]. This Air compressor connecting components washer is used under the screw plug or other large threaded connections in the cooling system. The FPM1 rubber provides excellent resistance to hot coolant and oil, ensuring a leak‑free seal. Replace this Air compressor connecting components washer every time the associated plug or fitting is removed.
The straight‑through pipe joint is a steel or brass fitting that connects two sections of pipe or hose end‑to‑end. This Air compressor connecting components joint is used where a rigid connection between the cooling pipe and a rubber hose is required. The joint has barbed ends that grip the hose securely, and is used in conjunction with the elastic steel belt clamps to prevent leaks. The straight‑through design ensures minimal restriction to coolant flow.
Two screw‑in straight‑through joints with NG12 thread and M16x1.5 thread size provide threaded connections in the Air compressor connecting components piping system. This joint is used to connect the compressor cooling pipes to the engine block or to adapt between different thread types. The joint has a hexagon body for easy installation with a wrench, and a conical sealing seat that mates with the pipe flare or uses a sealing washer. These joints are supplied as duplicates, ensuring there are enough for both the inlet and return circuits.
Three elastic steel belt clamps with 44mm width and 12mm tightening range are used to secure the cooling hoses to the pipes and fittings of the Air compressor connecting components system[reference:3]. These clamps are made from spring steel with a self‑tightening design that maintains constant tension as the hoses expand and contract with temperature changes. Unlike worm‑drive clamps, these elastic clamps do not cut into the rubber and provide a uniform sealing force around the entire circumference.
The cooling inlet pipe of air compressor is a steel tube that carries engine coolant from the engine water pump to the compressor cooling jacket. This Air compressor connecting components pipe is the counterpart to the cooling return pipe, forming a complete cooling circuit around the compressor cylinder head. The pipe is pre‑formed to the exact shape required for the MC13 engine layout, and includes mounting brackets that attach to the engine block using the supplied M8 bolts.
The buckle‑type pipe clamp is a spring steel clip used to secure the Air compressor connecting components pipes or hoses to the engine block or chassis[reference:4]. This clamp has a quick‑release buckle design that allows for easy removal and reinstallation without tools. It is used where the cooling pipes run near other components and need to be prevented from vibrating against each other.
Two fixed blocks are small rubber‑insulated metal brackets that provide additional support for the Air compressor connecting components pipework. These blocks are bolted to the engine block and feature a rubber bushing that isolates the pipe from vibration. The fixed block prevents the cooling pipes from sagging or moving over time, ensuring they do not contact hot exhaust components or moving parts.
Air compressor connecting components – genuine HOWO hardware and pipe kit for MAX 4X2 MC13
This Air compressor connecting components kit includes all necessary pipes, hoses, clamps, bolts, joints, sealing washers, and mounting blocks for a full air compressor service. No additional hardware purchases are required; this Air compressor connecting components kit contains every OE part needed for repair or replacement.
All Air compressor connecting components bolts are property class 10.9 with MAN183 thread locking patches. They resist loosening under engine vibration and provide consistent clamp load for the pipe brackets, ensuring reliable, leak‑free connections.
The cooling pipes and hoses in this Air compressor connecting components kit are rated for continuous exposure to hot engine coolant up to 120°C. The composite sealing washers are made from FPM1 rubber, which resists heat and oil, preventing leaks at threaded connections.
Every pipe, tube, and bracket in this Air compressor connecting components kit is formed to the exact MC13 engine layout. No cutting, bending, or modification is required; the Air compressor connecting components install directly onto the factory mounting points.
The air compressor on the HOWO MAX 4X2 MC13 engine is driven by the engine gear train and supplies compressed air for the brake system and pneumatic accessories. The Air compressor connecting components manage three critical functions: intake air supply, cooling, and mounting. Intake air is drawn through the air inlet pipe and resonance tube, which also reduces noise. Cooling is provided by the coolant inlet and return pipes, which circulate engine coolant through the compressor cylinder head to prevent overheating.
The mounting bolts and fixed blocks secure the compressor and its pipework to the engine block. The elastic steel belt clamps and screw‑in joints ensure that all hose and pipe connections remain sealed under pressure and vibration. The composite sealing washers prevent coolant leakage at threaded ports. Without properly functioning Air compressor connecting components, the compressor may overheat, lose efficiency, or cause a loss of air pressure for the brakes, posing a serious safety risk.
Before installation, drain the engine coolant and disconnect the battery. Remove the old Air compressor connecting components pipes and brackets. Clean all mounting surfaces on the compressor and engine block. Install the cooling inlet and return pipes using new composite sealing washers, torquing the screw‑in joints to 30 Nm.
Secure the pipes to the engine block using the fixed blocks and the M8x40 and M8x70 flange bolts (torque to 25 Nm). Attach the air inlet pipe and resonance tube using the supplied clamps. Install the elastic steel belt clamps over the rubber hose connections, ensuring they are fully seated in the groove. Reconnect the battery, refill coolant, and start the engine. Check all Air compressor connecting components for leaks while the engine is at operating temperature. The system is now ready for service.
If the air compressor overheats, the cooling inlet or return pipes may be blocked or kinked. Inspect the Air compressor connecting components pipes for crushing or pinching. Coolant leakage at the threaded connections usually indicates a damaged composite sealing washer; replace the washer and retorque the joint.
A hissing sound from the compressor intake may mean the air inlet pipe or resonance tube is cracked; replace the affected Air compressor connecting components pipe. If the compressor mounting bolts have loosened, replace them with new grade 10.9 bolts, as the old thread locking patch may have failed. Elastic steel belt clamps that have lost tension should be replaced with new ones; they cannot be retightened. A squealing noise from the compressor area may indicate that a fixed block rubber isolator has failed, allowing the pipe to contact another component.
Inspect the Air compressor connecting components for leaks or cracks during every scheduled service (every 50,000 km). Check the elastic steel belt clamps for rust or loss of spring tension; replace any that are damaged.
The composite sealing washers should be replaced if any coolant seepage is observed. The air inlet pipe and resonance tube should be inspected for cracks or splits. The fixed block rubber isolators should be checked for hardening or cracking. Keep the area around the Air compressor connecting components clean to prevent dirt buildup that could retain moisture and cause corrosion.
This Air compressor connecting components kit is specifically designed for the SINOTRUK MC13 engine used in HOWO MAX 4X2 tractors, SITRAK C7H, and HOWO T7H trucks. It fits all production years from 2018 onward and is compatible with the Hi_SCR emission system. The Air compressor connecting components are also suitable for MC11 engines, though pipe lengths may differ. This Air compressor connecting components kit is not compatible with older WD615 or D10 engine series, which use different compressor mounting arrangements. Always verify your engine serial number before ordering this Air compressor connecting components kit.
Aftermarket Air compressor connecting components pipes are often made from thinner wall tubing that cracks under vibration. Generic bolts may not meet grade 10.9 and can break, causing the compressor mount to fail. Non‑genuine elastic clamps may lack the correct spring tension, leading to hose disconnection and coolant loss. The composite sealing washers in copy kits may be made from ordinary rubber instead of FPM, hardening and leaking within months. Genuine HOWO Air compressor connecting components are manufactured to SINOTRUK’s exact specifications,
using heavy‑gauge steel tubing, certified grade 10.9 fasteners, correct‑tension spring clamps, and FPM seals. The small additional cost of genuine Air compressor connecting components is insignificant compared to the cost of a failed air compressor or, worse, a loss of brake air pressure on a loaded tractor‑trailer combination.
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