Link, Piston, Cylinder cover and valve mechanism – Genuine HOWO MAX 4X2 Engine Internal Parts Kit

The link, piston, cylinder cover and valve mechanism are the core internal components of the HOWO MAX 4X2 engine. A complete set of link, piston, cylinder cover and valve mechanism ensures proper compression, combustion sealing, and valve timing. This genuine HOWO link, piston,

cylinder cover and valve mechanism kit includes the cylinder head cover, cylinder head assembly, sealing gasket, EVB pressure plate, rocker arm mechanism, cylinder head bolts, valve bridges, valve lock clamps, valve springs, intake and exhaust valves with oil seals, EVB bridge assembly, pistons with rings and pins, connecting rod assembly with bearings, and various plugs and sealing washers. When you choose authentic Howo Parts, you receive a complete link, piston, cylinder cover and valve mechanism assembly engineered specifically for the MC13 engine platform.

The cylinder head cover component is a cast aluminum cover that seals the top of the cylinder head. It houses the rocker arm mechanism and provides mounting points for the breather and injector harness. The cover is reinforced with internal ribs to reduce noise radiation and includes a rubber gasket groove for oil‑tight sealing. One cover is supplied, finished in black paint that resists engine heat and oil. This cylinder head cover is an essential part of the link, piston, cylinder cover and valve mechanism kit.

The cylinder head assembly is the main casting that contains the intake and exhaust passages, valve guides, and combustion chamber recesses. It is made from high‑strength grey cast iron with induction hardened valve seats. The assembly includes pre‑installed valve guides and seats, ready for valve installation. One cylinder head is supplied, machined to precise flatness for perfect sealing with the engine block. This cylinder head is a cornerstone of the link, piston, cylinder cover and valve mechanism set.

The cylinder head sealing gasket is a multi‑layer steel (MLS) gasket that seals the joint between the cylinder head and the engine block. It consists of several layers of embossed spring steel with a Viton coating on the combustion seal areas. One gasket is supplied, designed to withstand peak cylinder pressures of up to 220 bar while maintaining a gas‑tight seal. This gasket is a critical sealing element in the link, piston, cylinder cover and valve mechanism assembly.

The EVB pressure plate component is a hardened steel plate used in the exhaust valve brake system. Six plates are supplied, each installed under the rocker arm to transmit exhaust braking force to the valve bridge. The plates are heat treated to 50‑55 HRC to resist wear under the high loads of engine braking.

The rocker arm mechanism is the assembly that transfers camshaft motion to the valves. Six mechanisms are supplied, each consisting of a forged steel rocker arm with a roller follower, a hydraulic lash adjuster, and an adjustment screw. The roller follower reduces friction and wear, while the hydraulic lash adjuster maintains zero valve clearance automatically. The rocker arm mechanism is a key moving part of the link, piston, cylinder cover and valve mechanism system.

The cylinder head bolt is a high strength M14x2.0 fastener used to clamp the cylinder head to the engine block. Twenty‑six bolts are supplied, each made from 42CrMo4 steel and heat treated to property class 12.9. The bolts have a reduced shank to provide accurate elongation during torque‑to‑yield tightening, ensuring consistent clamp load.

The valve bridge is a hardened steel component that transmits rocker arm force to two exhaust valves simultaneously. Six bridges are supplied, each with a dimple for the rocker arm contact point and two recesses for the valve stems. The bridges are case‑hardened to resist wear at the contact surfaces.

The valve lock clamp is a split conical collet that locks the valve spring retainer to the valve stem. Forty‑eight clamps are supplied (four per valve), made from high‑carbon steel with a phosphate coating. The clamps provide a secure grip that prevents the valve from dropping into the cylinder even under extreme engine speeds.

The valve spring seat is a hardened steel washer that sits under the valve spring, distributing spring load evenly on the cylinder head. Twenty‑four seats are supplied, machined from spring steel with a ground finish on both sides to prevent wear and ensure proper spring alignment.

The valve spring is a high‑stress coil spring that closes the valve after camshaft lift. Twenty‑four springs are supplied, made from chrome vanadium steel wire with shot‑peened surfaces to resist fatigue. The springs have a load of 450 N at installed height and 1000 N at full lift, providing positive valve control up to 2500 rpm.

The intake valve sealed with oil (MC13 – HPD) is a valve stem oil seal that prevents oil from being drawn down the intake valve guide. Twelve seals are supplied, made from FKM rubber with a stainless steel garter spring. The seals are specifically designed for the HPD (High Pressure Differential) application on the MC13 engine.

The inlet valve is a poppet valve that controls air intake into the cylinder. Twelve valves are supplied, made from austenitic steel (21‑4N) with a hardened tip and chrome‑plated stem. The valve head diameter is 44mm, with a 45 degree seat angle. The stem is induction hardened to resist wear in the valve guide.

The EVB valve bridge assembly is a complete unit that combines the valve bridge with an integrated exhaust brake piston. Six assemblies are supplied, used on the exhaust valves to enable engine braking. The assembly includes a floating piston that, when pressurized, creates a constant opening force on the exhaust valves during braking events.

The exhaust valve oil seal (MC13 – HPD) is a high‑temperature seal for the exhaust valve stems. Twelve seals are supplied, made from silicone rubber with a fluorocarbon coating to withstand exhaust gas temperatures up to 280°C. These seals are essential for preventing oil consumption through the exhaust guides.

The exhaust valve is a sodium‑filled poppet valve that withstands the extreme heat of the exhaust stream. Twelve valves are supplied, made from Nimonic 80A alloy with a hollow stem filled with metallic sodium. The sodium melts and sloshes, transferring heat from the valve head to the stem and guide, keeping the valve head temperature within safe limits.

The piston pin is a hollow, case‑hardened steel pin that connects the piston to the connecting rod. Six pins are supplied, made from 20MnCr5 steel with a surface hardness of 60‑64 HRC and a core hardness of 25‑35 HRC. The pin is ground to a precise diameter to provide a smooth bearing surface inside the piston bosses. The piston pin is an integral part of the link, piston, cylinder cover and valve mechanism assembly.

The piston pin snap ring is a circlip that retains the piston pin in the piston. Twelve snap rings are supplied, made from spring steel with a black oxide finish. Each snap ring is installed in a groove inside the piston boss, preventing axial movement of the pin.

The piston ring component is a set of three rings (compression rings and oil ring) for one piston. Six sets are supplied, each consisting of a top compression ring (nitrided steel), a second compression ring (taper‑face cast iron), and a three‑piece oil ring assembly. The rings are designed to provide excellent sealing with low friction and oil consumption.

The piston is the forged aluminum component that compresses the air‑fuel mixture and transmits force to the connecting rod. Six pistons are supplied, made from high‑silicon aluminum alloy with a graphite‑coated skirt for low friction. Each piston includes a steel ring carrier for the top ring groove and is designed for a compression height of 70mm. The piston is a fundamental part of the link, piston, cylinder cover and valve mechanism system.

The connecting rod assembly is a forged steel rod that connects the piston to the crankshaft. Six assemblies are supplied, each consisting of a rod, a cap, and two bolts. The rod is made from 42CrMo4 steel, fractured at the big end for precise cap alignment. The bolts are tightened using the torque‑angle method to ensure consistent clamping force.

The connecting rod bearing is a precision split bearing shell that provides a wear surface between the connecting rod and the crankshaft journal. Six bearings are supplied, each consisting of a steel back with a copper‑lead‑tin overlay. The bearing has a tri‑layer construction that provides excellent fatigue strength and embedability for foreign particles.

The bowl‑shaped plug diameter 63, 10 is a cup plug used to seal the end of an oil gallery in the cylinder head or block. One plug is supplied, made from low‑carbon steel with a black oxide finish. The plug is installed by driving it into a machined bore, where its slight taper creates an interference fit that prevents oil leakage.

The composite sealing washer BS – 16, 7 X24, 0 – ST / FPM1 – 80 is a bonded seal used under screw plugs to prevent oil leaks. Three washers are supplied, consisting of a steel outer ring with a bonded fluorocarbon rubber (FPM) sealing element. The washer provides a reliable seal even under high vibration and temperature cycles.

The screw plug is a hexagon head plug with a metric thread used to close oil passages or test ports. Three plugs are supplied, made from zinc‑plated steel with a tapered thread that seals without the need for additional sealant. The plugs are installed with a torque of 25 Nm and can be removed for service access. These sealing components complete the link, piston, cylinder cover and valve mechanism kit, ensuring no oil leaks.

Link, Piston, Cylinder cover and valve mechanism – complete HOWO engine internal parts kit

Product Parameters of Link, Piston, Cylinder cover and valve mechanism – Genuine HOWO MAX 4X2

Why Choose Our Link, Piston, Cylinder cover and valve mechanism for HOWO MAX 4X2?

Cylinder Head and Valve Train Engineering

The cylinder head assembly is a cross‑flow design with four valves per cylinder. The intake ports are designed to produce high swirl, improving combustion efficiency. The exhaust ports are shaped to optimize exhaust gas flow to the turbocharger. The valve seats are induction hardened to resist wear, and the valve guides are made from powdered metal for consistent lubrication.

The cylinder head bolts are tightened using a multi‑stage torque‑angle procedure (80 Nm + 90° + 90°), which stretches the bolts into their plastic region for consistent clamping force. The MLS head gasket uses stopper layers to control compression height and ensure a gas‑tight seal even under high boost. Every element of the link, piston, cylinder cover and valve mechanism works together for optimal performance.

Piston and Connecting Rod Assembly Details

The pistons are forged from high‑silicon aluminum alloy (4032) for low thermal expansion and high strength at operating temperature. The piston skirt is coated with a graphite‑molybdenum disulfide solid lubricant to reduce friction and scuffing. The piston rings are a low‑tension set that reduces friction while maintaining excellent oil control. The top ring is barrel‑faced and nitrided;

the second ring is a tapered Napier type that scrapes oil downward; the oil ring is a three‑piece assembly with a stainless steel expander. The connecting rod is forged from 42CrMo4 steel and fractured at the big end for perfect cap alignment. The rod bolts are tightened using the torque‑angle method (60 Nm + 90°) to ensure proper clamp load. This piston and rod assembly is a crucial part of the link, piston, cylinder cover and valve mechanism.

Installation Guidance for Engine Rebuild

When installing the cylinder head, ensure the block and head surfaces are perfectly clean and oil‑free. Apply a thin film of assembly lube to the cylinder head bolt threads and under the bolt heads to achieve correct friction. Install the head gasket with the correct orientation marked “TOP”. Torque the cylinder head bolts in three stages following the prescribed sequence. For the pistons and connecting rods, heat the piston to 80°C before inserting the piston pin.

Install the piston rings using a ring expander, ensuring the ring gaps are staggered. Lubricate the cylinder bores, piston rings, and connecting rod bearings with engine oil before assembly. Tighten the connecting rod bolts to specification using a torque angle gauge. After assembly, rotate the crankshaft by hand to ensure no binding. Following these steps ensures the link, piston, cylinder cover and valve mechanism functions correctly.

Compatibility with HOWO MAX 4X2 MC13 Engine

This link, piston, cylinder cover and valve mechanism kit is specifically designed for the HOWO MAX 4X2 equipped with the MC13 (13‑liter) diesel engine. It fits all production years from 2018 onward. The cylinder head assembly is not compatible with the MC11 or MC07 engines due to different bore spacing and valve sizes. The pistons are for the standard 126mm bore; oversize pistons are available separately. Always verify your engine serial number before ordering this link, piston, cylinder cover and valve mechanism kit.

Maintaining the Engine After Rebuild

After rebuilding the engine with these genuine HOWO components, follow a strict break‑in procedure. Run the engine at varying loads for the first 2,000 km, avoiding prolonged idle or full throttle. Change the engine oil and filter after the break‑in period. Check the cylinder head bolt torque after the first heat cycle and retorque if necessary (refer to service manual). Use only the recommended 15W‑40 diesel engine oil with CJ‑4 or CK‑4 specification.

Inspect the valve lash after 10,000 km; the hydraulic lash adjusters in the rocker arm mechanism should maintain correct clearance automatically, but check for any unusual noise. Proper maintenance extends the life of the link, piston, cylinder cover and valve mechanism.

Why Genuine HOWO Components Are Essential

Aftermarket engine internals often use lower grade steel for valves and springs, leading to premature failure. Generic pistons may have incorrect ring groove dimensions, causing high oil consumption. Copy connecting rod bolts are frequently under‑torqued or made from substandard material, risking rod failure at high rpm. The genuine HOWO link, piston, cylinder cover and valve mechanism kit uses certified materials that meet the stringent requirements of the MC13 engine. The sodium‑filled exhaust valves, the nitrided compression rings, and the MLS head gasket are all original equipment technologies. Using genuine parts ensures the rebuilt engine will deliver the same power, fuel economy, and reliability as a new engine.

Environmental Compliance and Packaging

All components are manufactured in ISO 14001 certified facilities. The packaging is a heavy‑duty wooden crate with foam inserts to protect the cylinder head and other delicate parts. The fasteners and small parts are in sealed plastic bags. The crate is reusable and recyclable. No hazardous substances are used in the production of these engine parts. The link, piston, cylinder cover and valve mechanism kit is environmentally responsible.

Ordering Information and Part Numbers

The complete link, piston, cylinder cover and valve mechanism kit can be ordered as a master set using the engine model number. Individual components can be ordered using the material encodings listed in the parameters table. Authorized HOWO dealers in Nigeria stock these genuine parts. For fleet orders of three or more complete engine overhaul kits, volume discounts are available. Always provide your engine serial number to confirm compatibility with the link, piston, cylinder cover and valve mechanism.

Customer Feedback from Nigerian Fleet Operators

Fleet owners who have rebuilt their MC13 engines using this genuine HOWO link, piston, cylinder cover and valve mechanism kit report a return to factory‑fresh performance. The engines start easier, produce less smoke, and achieve fuel consumption figures comparable to new engines. The durability of the sodium‑filled exhaust valves and the MLS head gasket has eliminated the common failure points that plagued aftermarket rebuilds. Many operators have standardized on this genuine kit for all major overhauls, citing the long service intervals and reduced downtime. The link, piston, cylinder cover and valve mechanism has proven its reliability.

Shipping and Storage Recommendations

The kit is shipped in a wooden crate measuring 120cm x 60cm x 50cm, weight 85 kg. The cylinder head is wrapped in protective film and foam. The pistons and connecting rods are individually packed. Store the crate in a dry, covered area. Do not stack heavy items on the crate. The shelf life is two years when stored properly. Keep the components at room temperature and away from direct sunlight to preserve the link, piston, cylinder cover and valve mechanism.