The exhaust system is a critical component that directs high‑temperature gases away from the engine, reduces noise, and controls emissions. A complete exhaust system includes manifolds, heat shields, gaskets, and heat‑resistant fasteners. This genuine HOWO exhaust system kit contains front, rear, and intermediate exhaust manifolds, heat shields, spacer bushings, exhaust pipe gaskets, and all specialized bolts. When you choose authentic Howo Parts, you receive a complete exhaust system assembly engineered for the MC13 engine. For a full engine overhaul, also see our cylinder head kit.
The hexagon bolt with flange GB / T 5789 – M8×16 – 21CrMoV5 – 7 (17709) + QT – DIN267 – 13 – GB / T5267.1 – C3J is a high‑temperature fastener used throughout the exhaust system. Nine bolts are supplied, made from 21CrMoV5 heat‑resistant steel, quenched and tempered. The bolt has a thread size of M8x1.25 and a length of 16mm. The flange head distributes clamping load and eliminates the need for a separate washer.
This bolt is designed to withstand exhaust gas temperatures up to 800°C without losing strength or galling. It is used to attach heat shields and insulation plates to the cylinder head and exhaust manifolds. The special alloy resists oxidation and scaling at high temperatures, ensuring the exhaust system remains securely fastened.
The heat shield – front row is a stamped metal cover that protects the front section of the exhaust manifold from heat radiation and also shields nearby components. One shield is supplied, made from aluminized steel with a thickness of 1.5mm. It is shaped to fit the front exhaust manifold assembly and includes pre‑drilled holes for the M8 heat‑resistant bolts. This heat shield prevents heat from damaging the wiring harness, fuel lines,
and plastic components near the front of the engine. It also reduces the surface temperature of the manifold, lowering the risk of burns during maintenance. The aluminized coating reflects radiant heat and resists corrosion. The front row heat shield is essential for maintaining safe operating temperatures in the engine compartment.
The heat shield – rear row is the counterpart for the rear exhaust manifold. One shield is supplied, also made from aluminized steel with the same thickness and coating. It protects the area around the rear manifold from heat. The rear heat shield is shaped to clear the turbocharger and EGR components.
It attaches using the same heat‑resistant bolts. Together with the front shield, it provides complete coverage of the exhaust manifold area. A missing or damaged heat shield can cause accelerated aging of rubber hoses and electrical connectors, leading to failures. Replacing both shields as part of an exhaust system overhaul is recommended.
The heat‑resistant bolt M10X50 is a long M10 fastener used to secure the exhaust manifolds to the cylinder head. Four bolts are supplied, made from heat‑resistant alloy steel with a property class equivalent to 10.9 at elevated temperatures.
The bolt has a thread size of M10x1.5 and a length of 50mm. It is coated with a high‑temperature anti‑seize compound to prevent galling. These bolts are torqued to 45 Nm and are designed to maintain clamp load despite the thermal expansion cycles of the exhaust system. They must not be reused; always install new bolts when replacing manifolds.
The heat‑resistant bolt M10X95 is a longer version used for the middle and rear manifold mounting points. Eight bolts are supplied, with a length of 95mm. They are identical in material and coating to the M10X50 bolts. These long bolts pass through the manifold flanges and spacer bushings to reach the cylinder head threads. The extra length is needed to accommodate the thickness of the manifolds and the insulation plates. Torque to 45 Nm as well.
The heat‑resistant bolt M10X57 is a medium‑length fastener used for specific mounting points on the intermediate manifold. Six bolts are supplied, with a length of 57mm. These bolts are also made from heat‑resistant alloy steel. They are used where the manifold flange is thicker but does not require the full 95mm bolt. Torque to 45 Nm.
The spacer bushing is a cylindrical steel sleeve that positions the exhaust manifold at the correct distance from the cylinder head. Six bushings are supplied, made from seamless carbon steel tubing with a black oxide finish. The bushing has an inner diameter of 10.5mm and an outer diameter of 16mm, with a length of 25mm.
It slides over the long M10 bolts and prevents overtightening that could crack the manifold flange. The spacer bushing also ensures proper alignment of the manifold with the cylinder head ports. It must be installed together with the heat‑resistant bolts.
The rear exhaust manifold assembly is a cast iron component that collects exhaust gases from the rear three cylinders. One assembly is supplied, made from high‑silicon ductile iron that resists cracking under thermal stress. The manifold has a smooth internal passage to minimize backpressure. It includes mounting flanges for the turbocharger and EGR cooler.
The rear manifold is bolted to the cylinder head using the M10X50 and M10X95 heat‑resistant bolts with spacer bushings. An exhaust pipe gasket seals each port. This manifold is designed to expand and contract without distortion, maintaining a leak‑tight seal over thousands of heat cycles.
The intermediate exhaust manifold is a cast iron component that connects the front and rear manifolds. One intermediate manifold is supplied, made from the same high‑silicon ductile iron. It bridges the gap between the two main manifolds and provides additional mounting points for heat shields. The intermediate manifold also includes ports for exhaust gas recirculation (EGR) takeoff on some variants. It is secured with the M10X57 bolts and uses exhaust pipe gaskets at each cylinder port.
The front exhaust manifold assembly collects exhaust gases from the front three cylinders. One assembly is supplied, also made from high‑silicon ductile iron. It is similar in design to the rear manifold but has a different shape to clear the engine front cover and accessory drives.
The front manifold bolts to the cylinder head using the M10X50 and M10X57 bolts with spacer bushings. It includes a mounting boss for the EGR pipe on some engines. Proper sealing of the front manifold is critical to prevent exhaust leaks that could damage the turbocharger or cause noise.
The exhaust pipe gasket is a multi‑layer steel (MLS) gasket that seals between the exhaust manifold and the cylinder head. Six gaskets are supplied, each made from three layers of embossed stainless steel with a graphite coating.
The gasket has a round shape with a center hole for the exhaust port and two bolt holes. The MLS construction allows the gasket to compress slightly, accommodating minor imperfections in the mating surfaces. The graphite coating helps fill microscopic voids. These gaskets are one‑time use; they must be replaced whenever the manifold is removed. Using new gaskets prevents exhaust leaks and the associated hissing sound and loss of turbo boost pressure.
The hexagon bolt with flange Q186 – M10X16 – 8.8 – MAN183 – B1 is a standard M10 flange bolt used to attach the heat shields to the manifolds. Six bolts are supplied, with a property class of 8.8, a thread size of M10x1.5, and a length of 16mm. These bolts are not subjected to extreme heat because they attach to the outer heat shields. They are torqued to 30 Nm. The flange head eliminates the need for a separate washer.
The insulation plate – Cylinder head is a large heat shield that covers the top of the cylinder head between the manifolds. One plate is supplied, made from embossed aluminum sheet with a reflective coating. It protects the injector wiring harness and fuel lines from radiant heat from the exhaust manifolds. The plate is contoured to fit around the valve cover and injectors. It is attached using the M8 heat‑resistant bolts and the M10X16 bolts. This insulation plate is critical for preventing heat‑related failures of electronic components near the engine.
Exhaust system – genuine HOWO complete manifold, heat shield, and fastener kit
| Material Encoding | Name |
|---|---|
| MQ6-01324-5311 | Hexagon bolt with flange GB / T 5789 – M8×16 – 21CrMoV5 – 7 (17709) + QT – DIN267 – 13 – GB / T5267.1 – C3J |
| 202V08120-5315 | Heat shield – front row |
| 202V08120-5316 | Heat shield – rear row |
| 200V90490-0051 | Heat-resistant bolt M10X50 |
| 200V90490-0032 | Heat-resistant bolt M10X95 |
| 201V90490-0030 | Heat-resistant bolt M10X57 |
| 200V91701-0830 | Spacer bushing |
| 200V08101-6317 | Rear exhaust manifold assembly |
| 202V08102-0639 | Intermediate exhaust manifold |
| 200V08101-6315 | Front exhaust manifold assembly |
| 201V08901-0315 | Exhaust pipe gasket |
| MQ6-03215-8403 | Hexagon bolt with flange Q186 – M10X16 – 8.8 – MAN183 – B1 |
| 201V08120-0403 | Insulation plate – Cylinder head |
This exhaust system kit includes front, intermediate, and rear exhaust manifolds, plus all necessary heat shields, gaskets, and heat‑resistant bolts. No need to source individual components; everything is matched for the MC13 engine.
All bolts are made from 21CrMoV5 or equivalent heat‑resistant alloy steel. They withstand exhaust gas temperatures up to 800°C without losing strength or seizing. The flange heads eliminate the need for separate washers.
The manifolds are cast from high‑silicon ductile iron that resists thermal fatigue and cracking. The smooth internal passages reduce backpressure, improving turbocharger response and fuel economy.
The multi‑layer steel gaskets provide a reliable seal even under extreme thermal cycling. They are included for every cylinder port and must be replaced with each manifold removal to prevent exhaust leaks.
Exhaust gases from each cylinder exit through the exhaust ports in the cylinder head. The front, intermediate, and rear exhaust manifolds collect these gases and direct them to the turbocharger inlet. The manifolds are bolted to the cylinder head using heat‑resistant bolts and spacer bushings. Exhaust pipe gaskets seal each port. Heat shields and insulation plates protect nearby components from radiant heat.
The manifolds are designed to expand and contract with temperature changes without cracking. A properly sealed exhaust system prevents leaks that would reduce turbo boost pressure, increase noise, and allow hot gases to damage engine bay components. Regular inspection of the exhaust system for cracks or loose bolts is essential. Using genuine HOWO parts ensures correct fitment and durability.
Before installation, ensure the engine is cool. Remove the old manifolds and clean the cylinder head mounting surfaces. Install new exhaust pipe gaskets on each port. Position the rear exhaust manifold assembly onto the rear three studs. Insert spacer bushings and hand‑tighten the M10X50 and M10X95 heat‑resistant bolts. Repeat for the front and intermediate manifolds using the appropriate bolts.
Torque all M10 bolts to 45 Nm in a crossing pattern. Install the front and rear heat shields using the M8 heat‑resistant bolts (torque 15 Nm). Attach the insulation plate to the cylinder head using the M8 and M10X16 bolts. Reconnect the turbocharger inlet pipe and EGR connections. Start the engine and check for exhaust leaks using soapy water or a smoke machine. If any leak is detected, retighten the bolts or replace the gasket. The exhaust system is now ready for service.
This exhaust system kit is specifically designed for the MC13 engine used in the HOWO MAX 4X2 tractor. It fits all production years from 2018 onward. The manifolds are cast to match the exact port spacing and bolt pattern of the cylinder head. The front and rear manifolds are handed left and right and cannot be interchanged. This kit is not compatible with the MC11 or MC07 engines. Always verify your engine serial number before ordering.
Inspect the exhaust system every 100,000 km. Check the manifolds for cracks, especially near the welding of the mounting flanges. Examine the heat shields for rust or loose attachments. Verify that all bolts remain tight; retorque if necessary. Listen for hissing sounds that indicate an exhaust leak. If a leak is found, replace the exhaust pipe gasket and the bolts.
The heat‑resistant bolts can be reused only if they are not damaged, but replacement is recommended. Keep the heat shields clean from oil or grease to prevent fires. A well‑maintained exhaust system ensures optimal turbocharger performance and engine efficiency.
If the engine produces a hissing noise that increases with load, suspect an exhaust leak at the manifold‑to‑head joint. Replace the gasket and retorque the bolts. If the engine lacks power, a cracked manifold may be leaking exhaust before the turbocharger, reducing boost pressure.
Inspect the manifolds for visible cracks. If the turbocharger does not spool up, check for a blocked or collapsed manifold internal passage (rare). If the heat shields rattle, tighten the mounting bolts or replace missing fasteners. Always use genuine HOWO parts for any repairs to the exhaust system.
Aftermarket exhaust manifolds are often made from lower grade cast iron that cracks under thermal stress. The bolt holes may not align correctly, leading to cross‑threading or stripped threads. Generic heat‑resistant bolts may be made from ordinary steel that loses strength at high temperatures, causing them to stretch or break.
The gaskets in copy kits are often simple asbestos‑free material that does not seal as well as MLS. Genuine HOWO exhaust system components are manufactured to the exact specifications of the original MC13 engine, using high‑silicon ductile iron, certified heat‑resistant alloys, and MLS gaskets. The small additional cost is far outweighed by the reliability and safety of a leak‑free exhaust system.
The exhaust system components are shipped in a reinforced cardboard box with foam dividers. The heavier manifolds are wrapped in protective plastic. The fasteners are in sealed poly bags. The packaging is recyclable. The manufacturing facility is ISO 14001 certified. No hazardous substances are used in production. The manifolds are coated with a rust preventive oil that should be wiped off before installation.
This exhaust system kit includes all 13 line items listed in the parameters table. Individual components can be ordered separately using their material encodings. Authorized HOWO dealers in Nigeria stock these genuine parts. For fleet orders of three or more complete kits, volume discounts are available. Always provide your engine serial number to confirm compatibility.
Fleet managers who have installed this genuine HOWO exhaust system kit report a noticeable reduction in exhaust noise and improved turbocharger response. The manifolds have resisted cracking even after extended high‑load operation. The heat shields have prevented damage to wiring harnesses. Many operators have standardized on this kit for all MC13 engine repairs, citing the complete all‑in‑one nature and the reliability of genuine components.
The kit is shipped in a box measuring 80cm x 40cm x 30cm, weight 25 kg. Store the components in a dry indoor area. Do not remove the protective oil from the manifolds until installation. The shelf life is indefinite when stored properly. Protect the manifolds from impact that could crack the cast iron.
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