Dongfeng LoongGine engine spare parts cylinder head cover Sealing gasket 1003038-E4200

Built as a critical barrier for the cylinder head system, this gasket features an advanced multi-layer composite structure. The core layer is a 2mm-thick high-temperature silicone rubber (VMQ) that provides excellent elasticity and sealing performance, adapting to minor surface irregularities of the cylinder head (≤0.1mm). The upper and lower layers are reinforced with glass fiber cloth (density 400g/㎡) to enhance tensile strength and prevent tearing. Metal reinforcement rings are embedded around each bolt hole to distribute clamping force evenly (torque 25-30N·m), avoiding gasket deformation. This structure blocks oil leakage and prevents dust/water intrusion, with a leakage rate tested to ≤0.001g/h—far below the industry limit of 0.01g/h

Engineered to endure the harsh conditions of the cylinder head (high temperature, oil immersion), the gasket uses premium materials with exceptional resistance. The VMQ silicone rubber core operates stably at temperatures ranging from -50℃ to 220℃, resisting degradation from high-temperature engine oil and exhaust heat. It exhibits minimal swelling (≤5%) after 1000-hour immersion in synthetic engine oil (150℃), maintaining elasticity and sealing performance. The glass fiber reinforcement layers resist chemical corrosion from fuel additives and coolant, while the metal rings (304 stainless steel) prevent rust and ensure long-term clamping stability. These features ensure the gasket’s service life reaches ≥250,000km

Optimized to maintain sealing integrity under engine vibration and thermal cycles, the gasket integrates compression recovery and vibration damping features. The VMQ rubber core has a compression set of ≤8% (after 72-hour compression at 180℃), meaning it rebounds to its original shape after repeated thermal expansion and contraction—avoiding permanent deformation that causes leakage. The composite structure absorbs 55% of the cylinder head’s torsional vibration (up to 20g loads, ISO 16750-3), reducing stress on the gasket and bolt connections. This ensures consistent sealing performance even after 150,000 thermal cycles (from 20℃ to 200℃), preventing oil leakage caused by gasket fatigue

The sealing gasket is designed for efficient installation and long-term cost savings, ideal for engine overhauls and fleet maintenance. Its rigid composite structure maintains shape during installation, ensuring easy alignment with the cylinder head’s bolt holes—reducing installation time by 40% compared to soft rubber gaskets. The gasket requires no additional sealants (thanks to its high elasticity), avoiding messy application and sealant-related leakage. By preventing oil leakage, it reduces engine oil replenishment costs by 30% and avoids expensive repairs caused by oil-contaminated components (e.g., alternator, timing chain). Backed by a 2-year/200,000km warranty, it provides a cost-effective solution for heavy-duty engine maintenance, minimizing downtime and operational costs