Material: High-strength ductile iron + composite gasket
Weight: 2.85 kg (complete assembly)
Heat resistance: -40°C ~ 150°C
Sealing: Dual-lipped Viton® seal
Bolt torque: 28–32 Nm
Compliance: National II / Euro II
| Parameter | Specification (VG1246040042) |
|---|---|
| OEM Number | VG1246040042 |
| Assembly type | Rocker arm lower cover (National II) |
| Fitment | HOWO 70/77/79, Sitrak C7/C9 |
| Gasket material | High-temp silicone + steel core |
| Bolt holes | 8 x M8×1.25 |
| Oil return port | Integrated with anti-drain valve |
| Surface finish | Electrophoretic coating (salt spray 240h) |
Every VG1246040042 cover is CNC-machined to exacting tolerances, guaranteeing a perfect match with the cylinder head. The lower cover protects the rocker shaft and pushrods from debris while ensuring consistent oil pressure.
National II certification means reduced particulate emissions and smoother valve actuation.
The integrated oil deflector and channel design distribute oil evenly to all rocker bearings. This extends camshaft and rocker arm life by 30% compared to standard covers.
Fits both mechanical and electronic injector engines.
The VG1246040042 rocker arm lower cover assembly (National II) is the result of extensive R&D and field testing. HOWO heavy trucks demand components that withstand high cylinder pressures, thermal cycling, and vibration. This cover’s ribbed structure dampens noise and increases rigidity. The integrated breather baffle separates oil mist from blow-by gases, reducing oil carryover into the air intake system.
Manufactured under ISO 9001:2015 and IATF 16949 standards, every unit is pressure-tested at 2.5 bar to verify sealing integrity. The gasket’s steel-core construction prevents extrusion even at peak engine loads. For fleets operating in cold climates, the low-temperature flexibility of the rubber compound ensures immediate sealing at start-up.
Dimensions: overall length 324 mm, width 186 mm, height 68 mm (including gasket). The cover’s contour matches the cylinder head profile of HOWO WD615 and WP10 engines. This part number is directly interchangeable with earlier National I variants, providing a clear upgrade path. The electrophoretic coating offers exceptional corrosion resistance, tested to 240 hours in salt spray.
Field data from more than 12,000 operating hours shows that the VG1246040042 lower cover reduces oil consumption by 12% due to superior baffling. The positive crankcase ventilation (PCV) port is pre-positioned for easy connection. Whether you are overhauling an engine or performing preventive maintenance, this assembly simplifies the job while delivering OEM-grade reliability.
For Sitrak models, the same VG1246040042 cover fits the MC07 and MC11 engine families. The bolt pattern aligns perfectly with the cylinder head, and the included dowel pins ensure centering during installation. Torque specifications are clearly marked on the cover, eliminating guesswork. The National II designation guarantees compliance with emission regulations in most Asian and African markets.
Every component – from the M8 flange bolts to the integrated oil seal – is sourced from certified suppliers. The cover’s casting is free from porosity and inclusions, verified by X-ray inspection. This attention to detail makes the VG1246040042 the preferred choice for workshops that demand first-time fit and zero comebacks.
The rocker arm lower cover also acts as a structural support for the rocker shaft, reducing deflection at high RPM. This stabilizes valve lash and improves fuel efficiency by up to 3%. Combined with the improved oil return, the cover aids in maintaining consistent hydraulic lash adjuster operation – especially important for modern electronic unit injectors.
Technical note: the assembly includes the cover, pre-installed gasket, 8 flange bolts, and a breather connector. No additional sealants are required. The gasket has a nominal thickness of 1.2 mm, providing the correct preload for the rocker shaft bearings. This design has been validated by HOWO’s engineering team, and the part number VG1246040042 is listed in the official spare parts catalogue.
The VG1246040042 rocker arm lower cover fits all HOWO series with WD615/WP10 engines, as well as Sitrak C7H and C9H. The installation is straightforward – clean the mating surface, position the gasket, torque bolts in a cross-pattern to 30 Nm. No special tools are required. Always refer to the workshop manual for final torque verification.
For any technical queries, consult the HOWO service bulletin or contact your authorised parts distributor. The VG1246040042 assembly is also available as a complete kit with rocker arm bolts and a new breather hose. This proven design continues to be the benchmark for durability in the heavy-duty segment.
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