Xinchai 490B Cylinder Head Cover A490B-11001 — HELI Forklift 490/495/498, 100% Original OEM

This cylinder head cover — also called valve cover or rocker cover — is the stamped steel or cast aluminum cover bolted to the top of the cylinder head that seals the entire valvetrain assembly (valves, rocker arms, rocker shaft, and camshaft on overhead-cam engines) from external dirt, debris, and moisture contamination. Part number A490B-11001 is the 100% original Xinchai OEM valve cover for the 490B, 495, and 498 series diesel engines — the most common engine family in Chinese forklifts, powering HELI, Hangcha, and Baoli 2-3.5 ton diesel models. The cylinder head cover serves a dual function: it contains the oil splash generated by rocker arm lubrication (the rocker shaft sprays oil onto the rocker pads at 30-60 psi) and it provides the oil fill cap mounting point and the PCV (positive crankcase ventilation) breather connection that vents crankcase pressure to the intake. A warped, cracked, or bent valve cover causes oil to leak onto the hot exhaust manifold — a fire hazard on any diesel engine running at 200-400°C exhaust temperatures.

This cover is manufactured by Xinchai in Chongqing, China with 100% original quality, 1-year warranty, and machinery test report with video outgoing-inspection provided. Weight: 1 kg. MOQ: 1 piece with delivery within 7 days. When replacing the cylinder head cover, always replace the valve cover gasket simultaneously — the gasket is a one-time-use rubber or cork component that takes a compression set after the first installation and will not reseal if reused. Clean the cylinder head sealing surface thoroughly with a scraper or solvent before installing the new gasket — even small amounts of old gasket material or oil on the mating surface will cause a leak. Apply a small dab of RTV silicone sealant at the corners where the gasket transitions over the camshaft end caps or timing cover junction. Torque the cover bolts in a cross-pattern sequence to the manufacturer’s specification — overtightening warps the thin steel cover and creates leaks that no gasket will seal. Recheck bolt torque after the first 20 engine hours as the new gasket compresses and settles.

Compatible with Xinchai 490B, 495, and 498 diesel engines in HELI, Hangcha, Baoli, and LongGong forklifts (2-3.5 ton class). Browse our complete cylinder head cover selection for 4D27G31 and Changchai engine variants. For technical questions, visit Xinchai official website for engine specifications.

Technical Specifications

Compatible Brands

100% original Xinchai OEM. Replace gasket and torque in sequence. Confirm your engine model before ordering →