The rocker arm einlass is a critical valve train component that controls the intake valves on the HOWO MAX 4X2 engine. A high quality rocker arm einlass ensures precise valve timing, reduced friction, and long service life.
This genuine HOWO rocker arm einlass kit includes the elastic snap ring, washer, engine rocker arm assembly, hexagon nut, adjusting screw, rocker arm holder, rocker arm shaft component, and additional screws. When you choose authentic Howo Parts, you receive a complete rocker arm einlass assembly engineered for the MC13 engine.
The elastic snap ring for shaft 32X1,5 is a circlip that secures the rocker arm components on the rocker shaft. Two snap rings are supplied, made from spring steel with a black oxide finish.
The snap ring has an inner diameter of 32mm and a thickness of 1.5mm. It is installed in a groove on the rocker shaft and prevents axial movement of the rocker arms. This rocker arm einlass component is critical for maintaining proper alignment of the rocker arms on the shaft, preventing side‑to‑side play that could affect valve lift accuracy. The snap ring is designed to withstand repeated thermal cycles without losing its spring tension.
The washer is a flat steel washer used under the hexagon nut to distribute clamping load. Two washers are supplied, made from zinc‑plated steel with an outer diameter of 18mm and an inner diameter of 10.5mm. These washers prevent the nut from embedding into the rocker arm holder and provide a smooth bearing surface for the adjusting screw. In the rocker arm einlass assembly, the washer ensures even torque distribution and prevents galling between the nut and the holder surface.
The engine rocker arm assembly is the complete rocker arm unit for the intake valves. One assembly is supplied, consisting of a forged steel rocker arm with a roller follower at one end and an adjusting screw pocket at the other.
The roller follower reduces friction against the camshaft lobe, improving fuel economy and reducing wear. The rocker arm has an oil passage that delivers lubrication to the roller bearing and the valve stem contact pad. This rocker arm einlass component is precision machined and heat treated to resist wear under high‑load conditions.
The hexagon nut M10X1 is a fine‑pitch locking nut used to secure the adjusting screw in the rocker arm. Two nuts are supplied, made from grade 10 steel with a zinc plating. The thread size is M10x1.0, which provides greater resistance to loosening under vibration compared to coarse threads.
The nut is tightened against the rocker arm after the valve lash is set, locking the adjusting screw in position. This rocker arm einlass nut is critical for maintaining correct valve clearance over thousands of operating hours.
The adjusting screw is a hardened steel screw that contacts the valve stem or valve bridge. Two screws are supplied, made from case‑hardened steel with a hex socket drive. The screw has a spherical tip that allows slight angular misalignment, ensuring even contact with the valve stem.
The thread is M10x1.0, matching the hexagon nut. The adjusting screw is used to set the valve lash precisely; after adjustment, the lock nut is tightened to secure it. This rocker arm einlass component is wear‑resistant and designed for easy adjustment using a hex key.
The rocker arm holder is a cast pedestal that supports the rocker shaft and positions the rocker arms correctly relative to the camshaft and valves. One holder is supplied,
made from high‑strength aluminum alloy with steel bushings at the shaft mounting points. The holder bolts to the cylinder head and contains oil galleries that feed pressurized oil to the rocker shaft. This rocker arm einlass component is critical for maintaining the geometry of the valve train and ensuring consistent oil supply to the rocker bearings.
The rocker arm shaft component is a hollow steel tube that serves as the mounting axle for the rocker arms. One shaft is supplied, made from case‑hardened steel with a precision ground outer diameter. The shaft is 32mm in diameter and has multiple oil holes that align with the rocker arm bearings to provide lubrication.
The ends of the shaft are chamfered for easy installation of the elastic snap rings. This rocker arm einlass component must be straight and within tight tolerances to ensure smooth rocker arm rotation without binding.
The screw is a standard hex head screw used to attach the rocker arm holder to the cylinder head. Two screws are supplied, each with a thread size of M8x1.25 and a length of 16mm. The screws are grade 10.9 and have a black oxide finish. They are torqued to 25 Nm and require no additional washers. These screws are essential for securing the rocker arm einlass assembly to the cylinder head and must be properly tightened to prevent oil leaks and maintain valve train stability.
An additional engine rocker arm assembly is supplied, identical to the first, for the intake valves on the other cylinders. This second assembly ensures that the rocker arm einlass kit provides sufficient components for a complete cylinder head rebuild.
The rocker arm is interchangeable with the first unit and includes the same roller follower, oil passage, and adjusting screw pocket. Having two assemblies allows the technician to replace all intake rocker arms on a 6‑cylinder engine (one per cylinder).
Rocker arm einlass – genuine HOWO intake rocker arm assembly kit
| Material Encoding | Name |
|---|---|
| MQ6-29010-0126 | Elastic snap ring for shaft 32X1,5 |
| 200V90701-0234 | Washer |
| 202-04201-6004 | Engine rocker arm assembly |
| 200V90501-0030 | Hexagon nut M10X1 |
| 200V04205-5009 | Adjusting screw |
| 200V04202-0136 | Rocker arm holder |
| 200-04203-5065 | Rocker arm shaft component |
| MQ6-02191-0616 | Screw |
| 202-04201-6003 | Engine rocker arm assembly |
This rocker arm einlass kit includes every component needed to rebuild the intake side valve train: rocker arms, shaft, holder, adjusting screws, lock nuts, washers, snap rings, and mounting screws. No missing parts; everything is matched for perfect compatibility.
The rocker arm einlass uses a roller follower instead of a sliding pad, reducing friction by up to 40%. This improves fuel economy and reduces camshaft wear. The roller bearing is sealed and pre‑lubricated for long life.
The adjusting screw and lock nut allow precise setting of valve clearance. The screw has a spherical tip for even contact, and the fine‑pitch nut holds adjustment securely even under high engine vibration.
All steel components are case‑hardened or through‑hardened to resist wear at high temperatures. The rocker arm einlass assembly is designed to withstand millions of cycles without fatigue failure.
The rocker arm einlass converts the rotational motion of the camshaft into linear motion that opens the intake valves. As the cam lobe pushes the roller follower upward, the rocker arm pivots on the shaft and pushes the adjusting screw downward onto the valve stem or valve bridge.
The rocker arm assembly amplifies the cam lift by a ratio of approximately 1.5:1, meaning a 10mm cam lift produces 15mm of valve lift. The roller follower reduces friction and allows the cam profile to be more aggressive without increasing wear. Proper lubrication is supplied through the hollow rocker shaft and internal oil passages. The rocker arm einlass must be installed with correct orientation; the oil hole must align with the oil supply hole in the shaft.
Start by cleaning the cylinder head and rocker shaft bore. Install the rocker arm holder onto the cylinder head using the two screws, torquing to 25 Nm. Slide the rocker arm shaft component through the holder, ensuring the oil holes face downward toward the valves. Install the rocker arms onto the shaft in the correct order (intake side).
Place the washers under the hexagon nuts. Insert the adjusting screws into the rocker arms, then loosely install the hexagon nuts. Set the valve lash to the specification (0.3‑0.4mm for intake valves) by turning the adjusting screw while holding the lock nut. Tighten the lock nut to 20 Nm. Install the elastic snap rings on both ends of the shaft to prevent axial movement. Rotate the engine manually to ensure no interference. The rocker arm einlass assembly is now ready for operation.
This rocker arm einlass kit is designed for the MC13 engine used in the HOWO MAX 4X2 tractor. It fits the intake side of the cylinder head. The rocker arm shaft diameter is 32mm, which is standard for this engine family. The kit is not compatible with the exhaust side, which uses a different rocker arm (auslass). Always verify your engine model before ordering. For engines with 6 cylinders, you may need multiple kits (one kit covers one rocker arm assembly per cylinder).
Periodically check the valve lash; excessive clearance indicates wear of the adjusting screw tip or valve stem. Listen for clicking noises from the valve cover; a rhythmic click suggests loose adjustment.
Inspect the rocker arm holder for oil leaks; the sealing gasket may need replacement. The roller follower should spin freely; if it feels rough, replace the rocker arm. The elastic snap rings should remain tight; if loose, replace them. Always use genuine HOWO parts for any repairs to the rocker arm einlass system.
If the engine has a tapping noise from the top end, the valve lash may be too loose. Readjust using the adjusting screw. If the noise is a dull knock, the rocker arm shaft may be worn. Measure the shaft diameter; if it is below 31.95mm, replace the shaft. If the rocker arm does not return fully, the roller follower may be seized; replace the rocker arm. If the adjusting screw will not stay adjusted, replace the hexagon nut. Always use genuine rocker arm einlass components for reliable repairs.
Aftermarket rocker arms often use plain bushings instead of roller followers, increasing friction and reducing fuel economy. The adjusting screws may be made from soft steel that wears quickly, requiring frequent lash adjustments. The lock nuts may have poor thread locking, allowing the lash to change.
The elastic snap rings may be made from low‑carbon steel that loses tension. Genuine HOWO rocker arm einlass components are manufactured to OEM specifications, using roller bearings, case‑hardened screws, and high‑tensile snap rings. The small additional cost is quickly offset by improved reliability and reduced maintenance.
All components are supplied in a recyclable cardboard box with foam inserts. The fasteners are in sealed poly bags. The manufacturing facility is ISO 14001 certified. No hazardous substances are used in the production of these parts. The rocker arm einlass kit is environmentally responsible.
This rocker arm einlass kit includes all nine 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 five or more kits, volume discounts are available. Always provide your engine serial number to confirm compatibility.
Fleet owners who have installed this genuine HOWO rocker arm einlass kit report quieter valve trains and improved fuel economy. The roller follower design has reduced the frequency of valve adjustments. The snap rings have stayed secure even after months of operation. Many operators have standardized on this kit for all MC13 engine rebuilds, citing the complete nature and the high quality of the genuine components.
The kit is shipped in a sturdy cardboard box measuring 40cm x 30cm x 15cm, weight 2.5 kg. Store the kit in a dry indoor area. Do not remove the protective oil from the rocker arms until installation. The shelf life is three years when stored properly. Protect the snap rings from deformation by not stacking heavy items on the box.
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