The part is the structural interface that connects the engine block to the transmission on the HOWO MAX 4X2 tractor. This Flywheel housing encloses the rotating flywheel assembly, protects the crankshaft rear oil seal, and provides mounting points for the starter motor. When you choose authentic Howo Parts, this Flywheel housing guarantees perfect alignment and leak free operation. Below are detailed descriptions of every component included with this Flywheel housing kit.
The part is the main structural casing that connects the engine to the transmission. This Flywheel housing is made from high strength nodular cast iron with a precision machined mating face that ensures perfect perpendicular alignment between the crankshaft and the gearbox input shaft. The part incorporates a large inspection opening for clutch access, reinforced mounting bosses for the starter motor, and oil drain channels to prevent fluid accumulation around the crank seal. The part also features locating dowel holes that guarantee repeatable alignment every time the transmission is removed.
The crankshaft rear oil seal is a spring loaded radial shaft seal that prevents engine oil from leaking past the rear of the crankshaft. This Flywheel housing mounted seal is made from high temperature FPM rubber with a stainless steel garter spring. The seal lip is coated with PTFE to reduce friction and extend service life. Proper installation of this seal into The part is critical; the seal must be pressed in squarely to a depth of 2.5mm from the housing face.
The access plate is a stamped steel cover that seals the inspection opening on The part. This Flywheel housing access plate allows technicians to inspect the flywheel ring gear and clutch assembly without removing the entire transmission. The plate is secured to The part using two M8 bolts and includes a rubber gasket to prevent dust and debris ingress. Removing this plate from The part also provides access to the torque converter bolts on automatic transmission variants.
The gasket is a precision cut fiber seal that sits between The part and the engine block. This Flywheel housing gasket is made from cellulose fiber with a nitrile rubber binder, providing excellent oil resistance and conformability to minor surface irregularities. The gasket is pre formed to match the complex contour of The part mounting face, ensuring a uniform seal around all bolt holes and oil passages.
Two M8x12 flange bolts with property class 8.8 and length 12mm secure the access plate to The part. These bolts feature an integral flange that distributes clamping load evenly across the access plate flange, eliminating the need for separate washers. The bolts have a zinc nickel coating that resists corrosion in the engine bay environment. Tighten these Flywheel housing access plate bolts to 12 Nm to avoid distorting the thin cover plate.
Nine M10x30 flange bolts with class 10.9 strength and length 30mm are the primary fasteners connecting The part to the engine block. These high strength bolts are torqued to 50 Nm in a specific sequence to ensure even clamping of The part gasket. The flange head design eliminates the need for washers and provides a large bearing surface against The part cast iron. Never reuse these Flywheel housing bolts once they have been torqued.
Four M10x40 flange bolts with class 10.9 strength and length 40mm are used where The part attaches to thicker sections of the engine block or rear support brackets. These longer bolts provide additional thread engagement depth, ensuring secure attachment of heavy components such as the starter motor support bracket. Tighten these Flywheel housing bolts to 50 Nm using a calibrated torque wrench.
Four M16x1.5×55 flange bolts with class 10.9 strength and fine pitch thread secure The part to the engine block at the highest load locations. These large diameter bolts are torqued to 180 Nm plus an additional 90° angle to achieve yield. The fine pitch thread provides greater clamping force and resistance to loosening under vibration. These Flywheel housing bolts are single use torque to yield fasteners that must be replaced if removed.
The sealant is a 300ml tube of LOCTITE 5900 RTV silicone gasket maker used to seal The part to the engine block and the oil pan. This Flywheel housing sealant is a one part moisture curing oxime silicone that forms a flexible, oil resistant rubber gasket capable of withstanding temperatures from -60°C to 232°C. The thixotropic nature of LOCTITE 5900 prevents the bead from sagging on vertical flanges, making it ideal for Flywheel housing installation. The sealant is applied as a continuous 3mm bead around the entire Flywheel housing perimeter, looping around each bolt hole, and cures to a tack free state in just 15 minutes.
Flywheel housing – genuine HOWO engine bell housing and seal kit for MAX 4X2 MC13
This Flywheel housing is manufactured from high strength nodular cast iron, offering superior rigidity and vibration damping compared to pressed steel alternatives. The part casting is stress relieved after machining to prevent distortion over time, ensuring that the transmission remains perfectly aligned with the crankshaft throughout the life of the engine.
This Flywheel housing kit includes the crankshaft rear oil seal, the mounting gasket, and a tube of LOCTITE 5900 RTV sealant. All sealing surfaces of The part are precision machined to ensure a leak free connection between the engine block and the transmission, preventing oil leaks and protecting the clutch from contamination.
All nineteen mounting bolts in this Flywheel housing kit are grade 10.9 or higher, including two torque to yield M16 bolts for the heaviest load points. The part bolt set meets MAN183 quality standards, ensuring consistent clamping force and resistance to loosening under severe vibration.
This Flywheel housing is designed specifically for the SINOTRUK MC13 engine in the HOWO MAX 4X2, with all dowel pin locations, bolt patterns, and machined surfaces matching the original casting. No modification or drilling is required to install this Flywheel housing, making it a true bolt on replacement component.
The part serves as the structural backbone that aligns the engine and transmission into a single rigid assembly. By precisely locating the transmission input shaft centerline relative to the crankshaft centerline, The part ensures that the clutch disc and pressure plate operate without eccentric wear. The part also encloses the rotating flywheel, preventing debris from entering the clutch area and containing any fragments in the event of a clutch explosion.
The integrated inspection openings in The part allow clutch wear monitoring and ring gear inspection without drivetrain removal. A cracked or warped Flywheel housing can cause transmission input shaft misalignment, leading to clutch judder, premature bearing failure, and oil leaks. Therefore, installing a genuine Flywheel housing during any engine or transmission overhaul is essential for long term reliability.
Before installing The part, ensure the engine block mating face is clean and free from old gasket material. Apply a continuous 3mm bead of LOCTITE 5900 sealant to The part mounting face, looping around each bolt hole. Position the gasket onto the engine block studs or dowels, then mount The part. Install the nine M10x30 bolts and the four M10x40 bolts finger tight,
then torque them to 50 Nm in a cross pattern starting from the center. Install the four M16x1.5×55 bolts and torque to 180 Nm, then tighten an additional 90° angle to yield. Install the crankshaft rear oil seal into The part using a seal installation tool to ensure it seats squarely. Press the seal to a depth of 2.5mm from the housing face. Install the access plate onto The part using the two M8x12 bolts torqued to 12 Nm. Allow the LOCTITE 5900 to cure for at least one hour before filling the engine with oil and starting.
If The part is cracked, a loud rumbling noise may be heard from the bellhousing area, and the engine may exhibit excessive vibration. Inspect The part visually for cracks, especially around the starter mounting bosses and the lower bolt holes. A warped Flywheel housing can cause oil leaks at the engine block interface or at the transmission flange.
Use a precision straightedge to check The part mating faces for warpage exceeding 0.1mm. If the crankshaft rear oil seal leaks persistently despite replacement, The part bore may be worn or the seal installation depth may be incorrect. The correct seal depth for this Flywheel housing is 2.5mm below the housing face. Loose Flywheel housing bolts can cause driveline vibration and clutch judder; retorque all bolts to specification and use thread locker on the M16 bolts.
The part requires no regular maintenance, but it should be inspected for cracks or damage whenever the transmission is removed for clutch service. Check The part mounting bolts for torque during every major service;
any bolt that feels loose should be replaced with a new fastener. The crankshaft rear oil seal inside The part should be replaced whenever The part is removed from the engine, as the seal is damaged during removal. Inspect the access plate gasket and replace it if it shows signs of hardening or cracking. Keep The part exterior clean and free from oil accumulation to prevent fire hazards. If the engine has suffered a major failure, The part should be replaced, as hidden cracks may not be visible to the naked eye.
This Flywheel housing is compatible with the SINOTRUK MC13 engine used in HOWO MAX 4X2 tractors, SITRAK C7H, and HOWO T7H trucks. The part fits all production years from 2018 onward and is designed for use with manual transmissions as well as automated manual transmissions (AMT). The part is also compatible with the MC11 engine platform, though different bolt sets may be required. This Flywheel housing is not compatible with older WD615 or D10 engine series, which use a different bellhousing bolt pattern. Always verify your engine serial number before ordering this Flywheel housing.
Aftermarket Flywheel housings are often made from lower grade cast iron that is more prone to cracking under load, and their mating faces may not be machined to the same flatness tolerance as the genuine component. A non genuine Flywheel housing can cause misalignment between the engine and transmission, leading to input shaft bearing failures and clutch wear.
The bolt holes in counterfeit Flywheel housings may not align perfectly, requiring drilling or forcing during installation. Genuine HOWO Flywheel housing components are manufactured to SINOTRUK’s exact specifications, using certified nodular cast iron and precision CNC machining. The small additional cost of a genuine Flywheel housing is negligible compared to the cost of transmission damage caused by a misaligned drivetrain.
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