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Genuine SINOTRUK VG1246050021 intake valve for D12 420HP engines. OEM replacement for HOWO T7H and A7 series trucks.
When your SINOTRUK HOWO 420HP truck starts losing power, burning oil, or running rough under load, one of the last things you might check is the intake valve — but it could be the root cause.
The VG1246050021 intake valve is the genuine factory-fitted component used across D12-powered HOWO models, including the popular T7H and A7 series equipped with the MC11 engine. It controls airflow into the combustion chamber, playing a critical role in fuel efficiency, turbo response, and overall engine longevity.
Manufactured to exact SINOTRUK specifications, this original intake valve features a high-nickel alloy stem for thermal stability and a stellite-faced head that resists erosion from constant hot gas exposure. The hollow stem design improves heat dissipation, while micro-polished surface finish reduces friction and carbon buildup — essential for long-haul reliability in harsh climates like North Africa, Central Asia, or tropical Southeast ports.
Unlike generic replacements that warp after a few thousand kilometers, the VG1246050021 maintains its shape and seal even under continuous high-load operation. Each unit undergoes magnetic particle inspection and airflow testing before leaving the factory, ensuring consistent performance across all six cylinders.
It’s commonly replaced during major top-end rebuilds, especially when drivers report reduced throttle response or black smoke under acceleration. We recommend replacing both intake and exhaust valves as a set, along with guides and seals, for best results.
We stock only authentic SINOTRUK engine components because we’ve seen too many operators waste time and money chasing cheap alternatives that fail prematurely. This one fits right, lasts longer, and keeps your engine breathing clean.
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Replacing intake valves requires precision work during engine overhaul. Before installing the VG1246050021 valve, inspect the guide bore for wear — excessive clearance causes misalignment and rapid failure. Clean carbon deposits from the seat area using a chamfer tool, then lap the new valve gently to ensure full sealing contact. Use OEM-spec valve springs and lock keepers; torque retaining nuts evenly in stages. Set valve clearance to 0.3 mm cold as per SINOTRUK service manual. After reassembly, prime the oil system and run the engine at idle for 10–15 minutes without load to allow proper break-in. Avoid high RPM operation for the first 500 km. Always replace valves in sets if multiple cylinders show wear — uneven flow leads to imbalance and poor performance.
