The exhaust system is a critical component for engine performance and emissions control on the HOWO MAX 4X2 tractor. A high quality exhaust system ensures proper backpressure, noise reduction, and compliance with environmental regulations. This genuine HOWO exhaust system includes over forty components, from mounting brackets to flexible pipes and sealing gaskets.
When you choose authentic Howo Parts, you receive a complete exhaust system engineered specifically for the MAX 4X2 chassis.
The post-processor mounting bracket is a heavy duty steel component that supports the aftertreatment device. This bracket is welded to the chassis frame and provides a stable mounting point for the exhaust system post processor. Its design minimizes vibration transfer to the sensitive aftertreatment components, extending their service life.
The silencer drawstring is a flexible tension cable used to secure the silencer to the chassis. Two drawstrings are included in the exhaust system kit, each made from galvanized steel wire with a plastic coating to prevent corrosion and rattling.
The spherical washer is a convex shaped washer that allows angular adjustment of bolts in the exhaust system. Four spherical washers are supplied, which work together with taper face washers to provide a self aligning joint that compensates for minor misalignments in the mounting surfaces.
The taper face washer has a concave profile that mates with the spherical washer. This combination creates a ball and socket type joint that allows the fastener to be tightened without bending the bolt, ensuring even clamp load distribution across the exhaust system flanges.
The hexagon toothed nut with flange M10 is a locking nut with a serrated flange. Four of these nuts are used to secure the post processor mounting bracket to the frame. The toothed flange bites into the steel surface, preventing loosening under vibration typical of the exhaust system.
The silencer bracket decorative panel, also known as the car armrest, is a trim piece that covers the silencer mounting bracket. It provides a finished appearance to the underside of the cab and protects the bracket from road debris. This component is made from UV stabilized plastic.
The hexagon bolt with flange M6 is a common fastener in the exhaust system. Nineteen bolts of this type are used throughout the assembly to attach heat shields, brackets, and trim panels. The integrated flange eliminates the need for separate washers.
The silencer insulation plate is a heat shield that protects the cab floor and surrounding components from the high temperatures generated by the silencer. This plate is made from aluminized steel with stamped ribs for added stiffness. It is a critical safety component of the exhaust system.
The hex bolt with serrated flange M14*1.5 is a heavy duty fastener used to connect the exhaust pipe flanges. Five bolts are included, each with a fine pitch thread that provides excellent vibration resistance. The serrated flange creates a positive lock without additional washers.
The MC09 exhaust tail pipe is the final section of the exhaust system that directs gases away from the vehicle. This pipe is made from stainless steel with a mandrel bent shape that optimizes flow while reducing backpressure. It is designed for the MC09 engine platform.
The trim panel is a decorative cover that fits over the tail pipe outlet. It gives a professional appearance to the exhaust system exit and helps direct exhaust flow downward to prevent re entry into the cabin.
The sealing gasket (Diameter 149mm) is a flat metal gasket used between the silencer and the tail pipe flange. It is made from graphite coated stainless steel that seals against high temperature exhaust gases while allowing slight flange movement.
The hex flange nut with teeth M14*1.5 is a locking nut for the M14 fine thread bolts. Five nuts are supplied, each with a toothed flange that bites into the mating surface, preventing loosening in the exhaust system.
The hexagon nut of type 1 M10*1.5 is a standard metric fine thread nut. Four nuts are used for mounting the aftertreatment support brackets. They are made from zinc plated steel for corrosion resistance.
The stainless steel cross recessed pan head screw M8*25 is a Phillips drive screw used to attach heat shields and insulation panels. Six screws are included, made from 304 stainless steel to resist rust from exhaust condensation.
The clamp is a band style fastener used to join two sections of exhaust pipe. Two clamps are supplied, each with a worm drive mechanism that allows easy tightening and removal. They are zinc plated for durability.
The silencer insulation plate (Front / Lightweight) is a smaller heat shield positioned at the front of the silencer. It is made from aluminum sheet with a reflective coating, reducing weight while still protecting nearby components from heat.
The exhaust flexible pipe assembly (insulation layer) is a corrugated stainless steel section that absorbs engine movement and thermal expansion. This flexible pipe includes an outer insulating layer that reduces heat radiation and protects the bellows from road debris.
The V-type clamp is a heavy duty band clamp used to seal the joint between the turbocharger outlet and the exhaust pipe. It provides a leak tight connection that can be removed and reused multiple times, an essential component of the exhaust system.
The tapered sealing gasket is a conical metal ring that fits into the V clamp joint. It is made from high temperature alloy steel and compresses to form a gas tight seal under clamp pressure. This gasket is critical for preventing exhaust leaks.
The hexagon head bolt M8 is a standard hex bolt used in several locations. Two bolts of this type are used to attach the silencer insulation plate. They are grade 8.8 with zinc plating.
The hexagon nut of type 1 M8 is a standard nut used with the M8 bolts. Two nuts are included, made from zinc plated steel, completing the fastening set for the insulation plate.
The clamp (712W97420-0012) is a specialized band clamp used on the exhaust pipe connections. Two clamps of this type are supplied, each with a captive nut design that simplifies installation in tight spaces. They are part of the exhaust system mounting hardware.
The exhaust pipe bracket is a stamped steel component that supports the mid section of the exhaust pipe. It bolts to the chassis rail and includes a rubber isolating mount that reduces vibration transmission to the pipe, extending the life of the exhaust system.
The rubber cushion block is a vibration isolating mount used between the exhaust pipe bracket and the pipe itself. Two blocks are included, each made from EPDM rubber that resists heat and ozone. They dampen movement while allowing the exhaust system to flex with engine torque.
The hexagon bolt with flange M10 is a flange bolt used to attach the rubber cushion block to the bracket. Two bolts are supplied, with a flange that eliminates the need for a separate washer.
The hexagon nut with flange M10 is a flange nut used with the M10 bolts. Two nuts are provided, completing the mounting hardware for the exhaust system hanger.
The insulation plate is a broad heat shield that protects the cab floor over a large area. It is made from embossed aluminum sheet with a reflective surface. This plate reduces heat transfer into the cabin and protects fuel lines from radiant heat.
The hexagon bolt with flange M10 (additional set) includes four bolts used to attach the main insulation plate to the cab floor. These bolts have an extended length to reach through the insulation thickness, ensuring a secure fit.
The nozzle mounting nut is a special nut used to secure the exhaust injection nozzle for the aftertreatment system. It is made from stainless steel to resist corrosion from the urea based exhaust fluid.
The M14x1.5 bolt (Length 10mm) is a short bolt used to plug an unused port on the exhaust manifold or as a mounting stud. Its fine thread provides a secure grip in high temperature aluminum castings.
The half round clamp is a split band clamp that wraps around the exhaust pipe and attaches to the mounting bracket. Two clamps are supplied, each with a rubber liner that cushions the pipe and prevents metal to metal contact.
The large washer is used under the half round clamp bolts to distribute clamping pressure. Two washers are included, made from thick steel to prevent deformation under high torque.
The sealing gasket (Diameter 149mm, Stainless steel sheath) is a reinforced gasket with a stainless steel outer layer. It provides superior sealing capability for high pressure exhaust joints and resists blowout under extreme conditions.
The washer is a standard flat washer used in one specific location to adjust spacer height. One washer is included, made from zinc plated steel with a precise thickness.
The rear suspension locking cushion block is a rubber isolator that also serves as a limit stop for the rear exhaust hanger. It prevents the exhaust system from contacting the chassis during extreme vehicle articulation, protecting both components.
Exhaust system – complete genuine HOWO assembly kit
| Material Encoding | Name |
|---|---|
| YZ952554005074 – Post-processor mounting bracket | |
| WG9525541028 – Silencer drawstring | |
| WG9000230001 – Spherical washer | |
| WG9000230002 – Taper-face washer | |
| ZQ32410T13F6 – Hexagon toothed nut with flange M10 | |
| YZ952554005082 – Silencer bracket decorative panel (car armrest) | |
| ZQ1840612TF6 – Hexagon bolt with flange M6 | |
| WG9525543236 – Silencer insulation plate | |
| ZQ1811450TF6 – Hex bolt with serrated flange M14*1.5 | |
| WG9525541239 – MC09 exhaust tail pipe | |
| WG9925540052 – Trim panel | |
| WG9925540503 – Sealing gasket (Diameter 149mm) | |
| ZQ32514T13F6 – Hex flange nut with teeth M14*1.5 | |
| ZQ340B10 – Hexagon nut of type 1 M10*1.5 | |
| WG1664930023 – Stainless steel cross-recessed pan head screw M8*25 | |
| WG9725540009 – Clamp | |
| WG9531540332 – Silencer insulation plate (Front / Lightweight) | |
| YZ952554005081 – Exhaust flexible pipe assembly (insulation layer) | |
| WG9925549679 – V-type clamp | |
| WG9925549690 – Tapered sealing gasket | |
| ZQ150B0845 – Hexagon head bolt M8 | |
| ZQ340B08 – Hexagon nut of type 1 M8 | |
| 712W97420-0012 – Clamp | |
| YG9525544713 – Exhaust pipe bracket | |
| WG84D 410007 – Rubber cushion block | |
| ZQ1841035 – Hexagon bolt with flange M10 | |
| ZQ32010 – Hexagon nut with flange M10 | |
| YZ952554004070 – Insulation plate | |
| ZQ1841016 – Hexagon bolt with flange M10 | |
| WG9725540782 – Nozzle mounting nut | |
| WG9525540408 – M14x1.5 bolt (Length 10mm) | |
| WG9925540009 – Half-round clamp | |
| Q402B16 – Large washer | |
| WG9925540504 – Sealing gasket (Diameter 149mm, Stainless steel sheath) | |
| 1.90004E+11 – Washer | |
| YG1671440058 – Rear suspension locking cushion block | |
This exhaust system includes every bracket, gasket, clamp, and fastener required for a full replacement. No need to source individual parts separately. All components are matched for perfect fitment on the HOWO MAX 4X2 chassis.
The exhaust system uses spherical washers, taper face washers, and rubber cushion blocks to absorb engine vibration. The flex pipe and multiple isolation mounts prevent fatigue cracking of the exhaust pipes, extending service life.
All exhaust system components are made from materials that withstand extreme heat. The sealing gaskets use graphite and stainless steel, the flexible pipe is stainless steel, and the insulation plates are aluminized steel. No premature failure from heat.
The exhaust system includes serrated flange bolts, toothed flange nuts, and self locking fasteners that maintain clamp load under vibration. The V clamp and half round clamps provide leak free joints that are easy to service.
The exhaust system is specifically designed for the MC09 engine platform and HOWO MAX 4X2 chassis. Every mounting bracket, heat shield, and pipe is shaped to fit the unique underbody layout of this tractor. The post processor mounting bracket locates the aftertreatment device in the optimal position for thermal management.
The silencer insulation plate and front lightweight plate protect the cab floor and fuel tanks from heat. The MC09 tail pipe directs exhaust away from the cab and trailer, preventing soot accumulation.
Start by removing the old exhaust components. Install the post processor mounting bracket using the hexagon toothed nuts M10. Attach the silencer bracket using the V clamp and tapered sealing gasket. Mount the flexible pipe assembly using the half round clamps and large washers.
Install the silencer with the drawstrings and the silencer insulation plate. Connect the tail pipe using the sealing gasket and hex bolts with serrated flange M14. Install all heat shields (insulation plates) using the M6 flange bolts and stainless steel screws. Attach the exhaust pipe bracket with rubber cushion blocks.
Tighten all fasteners to the torque specified in the service manual. Finally, install the trim panel and decorative silencer bracket cover. The entire exhaust system installation typically takes four hours for an experienced technician.
Inspect the exhaust system every 50,000 kilometers. Check the rubber cushion blocks for cracking or hardening. Verify that the V clamp and half round clamps are tight. Look for black soot around the sealing gaskets, which indicates a leak. Check the flexible pipe for cracks in the bellows. Inspect the silencer insulation plates for rust or damage. Replace any worn gaskets or clamps immediately.
The M8 and M6 fasteners should be retorqued after the first 1,000 kilometers of operation, as heat cycling can cause initial loosening. Use genuine HOWO replacement parts for any repairs to maintain the integrity of the exhaust system.
If you hear a hissing sound from the exhaust system, suspect a leaking gasket. Check the V clamp and the sealing gasket at the turbo connection. If the noise is coming from the flexible pipe, inspect for cracks in the bellows. Excessive vibration in the exhaust system may indicate a failed rubber cushion block or a loose clamp.
If the exhaust system contacts the chassis during driving, the rear suspension locking cushion block may be missing or worn. If soot appears around the silencer or tail pipe joints, the sealing gaskets should be replaced. Always use genuine gaskets, as aftermarket parts may not withstand the temperatures of the exhaust system.
Aftermarket exhaust parts often use thinner gauge steel that rusts quickly. Generic clamps may not provide even sealing pressure, leading to exhaust leaks. The spherical and taper face washers are unique to HOWO and are not available from generic suppliers. The flexible pipe in copy kits may not have the inner liner that protects the bellows from exhaust pulsation, leading to early failure.
The genuine exhaust system uses stainless steel and aluminized materials that resist corrosion. The insulation plates are precision formed with ribs for strength, while aftermarket plates are flat and prone to bending. For fleet operators, using genuine exhaust system components reduces downtime and repeat repairs.
This exhaust system is designed to support the aftertreatment system for Euro V and Euro VI emissions standards. The sealing gaskets and clamps ensure no exhaust leaks, which is critical for proper sensor readings. The insulation plates protect the urea injection components from heat.
The flexible pipe allows for thermal expansion without stress cracking, maintaining a sealed exhaust path. Using a genuine HOWO exhaust system helps maintain your vehicle’s emissions compliance, avoiding fines and contributing to cleaner air. The V clamp and tapered gasket seal is also used on many heavy duty trucks, and its reliability is proven in millions of miles of service.
This exhaust system is supplied as a complete kit under the collective bill of materials. Each component has its own material encoding as listed in the parameters table. For large fleet orders, the entire kit can be ordered as a single part number.
Authorized HOWO dealers in Nigeria stock these genuine exhaust system components. When ordering, provide your vehicle’s VIN to ensure compatibility, as some variations exist between model years. Bulk orders of five or more kits qualify for volume discount pricing.
The exhaust system kit is shipped in two reinforced cartons due to the length of the tail pipe and the weight of the brackets. The silencer insulation plates are packed in foam lined boxes to prevent denting. The flexible pipe is coiled in a protective bag.
The fasteners are packaged in sealed poly bags with labels. Store the components in a dry indoor area. Do not stack heavy items on the insulation plates. The rubber cushion blocks should be kept away from direct sunlight and ozone sources to prevent premature aging.
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