The Air intake accessories kit includes critical components for the intake air heating system on the HOWO MAX 4X2 MC13 engine. These Air intake accessories enable reliable cold‑starting and maintain the integrity of the intake manifold seal. When you choose authentic Howo Parts, these Air intake accessories guarantee the performance and reliability required for heavy‑duty service in cold climates. Below are detailed descriptions of every component included with this Air intake accessories kit.
Four M6x16 flange bolts with property class 10.9 and length 16mm secure the electrical heater mounting hole cover plate to the intake manifold. These Air intake accessories bolts feature an integral flange that distributes clamping load evenly across the cover plate, eliminating the need for separate washers.
The 10.9 grade indicates high‑tensile steel with exceptional strength, specifically engineered to withstand the thermal expansion and contraction cycles experienced by the intake manifold without loosening. The hexagonal flange face allows for easy installation and removal using standard socket tools, making maintenance tasks more efficient. Torque these Air intake accessories bolts to 12 Nm to ensure secure attachment without overstressing the aluminum manifold bosses. These bolts are coated with a zinc‑nickel finish to prevent corrosion from moisture and road salts that may be present in the engine bay environment, ensuring long‑term reliability of the Air intake accessories assembly.
The electrical heater mounting hole cover plate is a stamped steel component that seals the unused intake air heater mounting port on engines not equipped with the electric grid heater option. This Air intake accessories cover plate is made from 2mm thick zinc‑plated steel with a black powder‑coat finish for corrosion resistance. The cover plate features a precision‑machined sealing groove that accepts a gasket or the supplied flat seal, ensuring a leak‑proof closure of the intake manifold opening. Four mounting holes in the cover plate align exactly with the threaded bosses on the intake manifold, accepting the M6x16 flange bolts included in this Air intake accessories kit.
The cover plate is essential for maintaining intake manifold vacuum integrity; without it, unfiltered air could enter the engine, causing abrasive wear to pistons and cylinder liners. For vehicles ordered without the cold‑start heating option, this Air intake accessories cover plate is the standard factory fitment. The plate also prevents debris, insects, and moisture from entering the intake system through the unused heater mounting hole, protecting the turbocharger and combustion chambers from contamination. When a truck is retrofitted with an electric grid heater, the cover plate is removed and replaced by the heater element, and the Air intake accessories bolts are reused to secure the new component.
The air intake electrical heater sealing gasket is a precision‑cut flat gasket that seals the interface between the electrical grid heater and the intake manifold. This Air intake accessories gasket is made from high‑temperature composite material with a steel carrier core,
capable of withstanding exhaust gas temperatures up to 250°C. The gasket is pre‑formed to match the shape of the heater element mounting flange and the intake manifold port, ensuring a uniform seal around all four bolt holes. A properly installed Air intake accessories gasket prevents intake air leaks that would disrupt the air‑fuel ratio, leading to rough idling, poor fuel economy, and increased emissions. The gasket material is specifically formulated to resist the thermal cycling of the intake manifold, maintaining its sealing properties even after thousands of heating and cooling cycles.
When retrofitting a grid heater to a HOWO MAX 4X2, this Air intake accessories gasket must be placed between the heater element and the manifold before tightening the mounting bolts. The gasket also acts as an electrical insulator, preventing stray currents from passing through the manifold to the engine block. Without this Air intake accessories gasket, combustion gases could escape past the heater mounting flange, causing a hissing noise and loss of boost pressure.
Air intake accessories – genuine HOWO intake air heater mounting and sealing kit for MAX 4X2 MC13
These Air intake accessories provide everything needed to properly seal the intake air heater mounting port on MC13 engines, whether for blanking off the port or for retrofitting a grid heater. This Air intake accessories kit eliminates the need to source individual components separately.
The Air intake accessories bolts in this kit are property class 10.9, indicating high‑tensile steel that exceeds standard bolt strength. The part bolts are designed to withstand thermal expansion and engine vibration without loosening, ensuring the cover plate or heater element remains securely attached.
All Air intake accessories components in this kit bear the MAN183 quality mark, signifying they meet the stringent material and manufacturing standards of the original MAN technology license. This Air intake accessories kit is manufactured to SINOTRUK’s exact specifications for the MC13 engine platform.
The sealing gasket included in this Air intake accessories kit is made from high‑temperature composite material rated for 250°C service. The part gasket resists the intense heat radiating from the engine and maintains its sealing properties even after thousands of thermal cycles.
The MC13 engine is equipped with a threaded mounting port on the intake manifold designed to accept an electric grid heater. On standard specification trucks delivered to temperate climates, this port is blanked off using the electrical heater mounting hole cover plate.
The cover plate is secured by four M6x16 flange bolts, with a gasket or flat seal between the plate and the manifold to prevent intake air leaks. The air intake electrical heater sealing gasket is a critical component when a grid heater is retrofitted. The heater element is inserted into the manifold port, and the gasket seals the interface between the heater mounting flange and the manifold surface.
The grid heater consists of a set of resistive heating elements arranged in a grid pattern. When activated by the engine control unit (ECU), the heater draws electrical current from the battery and generates intense heat, raising the temperature of incoming air before it enters the combustion chambers. The intake air heating system helps warm the incoming air to improve cold-start performance,
reduce emissions, and enhance fuel efficiency. Proper sealing of the heater mounting interface is essential; an air leak at this point would allow unfiltered air to bypass the air cleaner, potentially causing abrasive wear to the turbocharger compressor wheel and engine cylinders. The gasket also provides electrical insulation between the heater element and the engine block.
For cover plate installation, start by cleaning the mating surface on the intake manifold around the heater mounting port. Remove any old gasket material or debris using a plastic scraper to avoid scratching the aluminum surface. Apply a thin film of high‑temperature grease to the flat sealing face of the cover plate. Position the electrical heater mounting hole cover plate over the port, aligning the four mounting holes with the threaded bosses.
Install the four M6x16 flange bolts and tighten them in a crossing pattern to 12 Nm using a calibrated torque wrench. For heater installation, clean the manifold port similarly, then place the air intake electrical heater sealing gasket onto the heater element mounting flange. Insert the heater into the manifold port, ensure the gasket is seated correctly, and secure the heater with the four Air intake accessories bolts, torqued to 12 Nm as well. Reconnect the electrical harness to the heater terminals and test the system for proper operation.
If a hissing noise is heard from the intake manifold area with the engine running, suspect a leaking seal around the cover plate or grid heater. Inspect the Air intake accessories gasket for damage and verify that the bolts are torqued to specification. If the engine produces white smoke after a cold start in low temperatures, the intake air heating system may be malfunctioning,
often due to a poor electrical connection at the heater or a damaged sealing gasket allowing air to bypass the heater element. If the cover plate is installed without a gasket or if the gasket is damaged, unfiltered air can enter the engine, causing abrasive wear to the turbocharger and cylinders. Inspect the Air intake accessories bolts for corrosion or stripped threads; replace any damaged bolts. If the engine idles rough after retrofitting a grid heater, verify that the gasket is correctly oriented and not blocking the airflow path.
The Air intake accessories components require no regular maintenance, but they should be inspected whenever the intake manifold is serviced or the engine is being diagnosed for air leaks. Check the cover plate or grid heater mounting bolts for tightness; retorque to 12 Nm if any movement is detected. Inspect the sealing gasket for cracking, hardening, or compression set; replace the Air intake accessories gasket if any damage is found. Keep the area around the Air intake accessories clean and free from oil accumulation,
as oil can degrade the gasket material. If the cover plate is removed for any reason, always install a new sealing gasket, as the old gasket will have taken a compression set and may not seal properly when reused. After any service that involves removing the cover plate or heater, test the engine for intake air leaks by spraying soapy water around the Air intake accessories mounting flange while the engine is idling; bubbles will appear if a leak exists. The electrical connections to the heater should be inspected for corrosion during routine maintenance, and dielectric grease should be applied to the terminals to prevent future corrosion issues.
This Air intake accessories kit is compatible with the SINOTRUK MC13 engine used in HOWO MAX 4X2 tractors, SITRAK C7H, and HOWO T7H trucks. The Air intake accessories fit all production years from 2018 onward and are designed for use with the standard intake air heater mounting port. The part is also compatible with the MC11 engine platform, though the gasket dimensions may differ slightly.
The cover plate is designed to seal the port on engines not equipped with the electric heater option, while the sealing gasket is used when retrofitting a grid heater. These Air intake accessories are not compatible with older WD615 or D10 engine series, which use a different mounting port design and bolt pattern. Always verify your engine serial number before ordering these Air intake accessories.
Aftermarket Air intake accessories components are often made from lower grade materials that fail prematurely. Generic cover plates may be stamped from thin steel that warps under engine heat, causing air leaks. The gaskets in copy Air intake accessories kits may be made from ordinary gasket paper that cannot withstand the high temperatures of the intake manifold, leading to rapid deterioration. The bolts in aftermarket Air intake accessories sets may not be genuine grade 10.9 fasteners; using lower grade bolts can result in loosening under vibration or thread stripping.
Genuine HOWO Air intake accessories components are manufactured to SINOTRUK’s exact specifications, using high‑grade steel for the cover plate, high‑temperature composite material for the gasket, and certified grade 10.9 fasteners. The small additional cost of genuine Air intake accessories is insignificant compared to the cost of engine damage caused by unfiltered air entering the intake system or by a failed heater gasket causing drivability issues. For fleet operators, using genuine Air intake accessories ensures compliance with manufacturer specifications and protects the engine from premature wear.
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