Xinchai 490B Engine Breather 495B-34000-2 — HELI Forklift 490/495/498 Crankcase Ventilation, 100% Original OEM

This is the engine crankcase breather (also called crankcase ventilation valve or PCV assembly, part number 495B-34000-2) for Xinchai 490B, 495, and 498 series diesel engines in HELI, Hangcha, and Baoli forklifts. The breather serves the critical function of venting blow-by gases from the crankcase to the intake manifold while separating oil mist from the ventilation gases — preventing crankcase pressure buildup that would otherwise force oil past every seal, gasket, and O-ring in the engine. On a diesel engine, blow-by is a normal byproduct of combustion: a small amount of high-pressure combustion gas leaks past the piston rings into the crankcase on every power stroke. At 2,600 RPM full load, this amounts to a continuous volume of gas that must be vented or the crankcase will pressurize. A clogged or malfunctioning breather causes the crankcase to pressurize — and pressurized crankcase gas follows the path of least resistance: front and rear crankshaft seals, valve cover gasket, oil pan gasket, dipstick tube, and oil fill cap. Once a seal is pushed out by crankcase pressure, it rarely reseats correctly and must be replaced along with the breather.

This is 100% original Xinchai brand from Chongqing, China with a 1-year warranty and machinery test report with video outgoing-inspection provided. 1 kg weight. MOQ: 1 piece, delivery within 7 days. Diesel engine type, engine repair parts classification. The Xinchai 490B breather is a simple but critical component — it consists of a wire mesh or baffle oil separator inside a housing that connects the valve cover breather port to the intake manifold or atmosphere (depending on engine configuration). Over time, the oil separator mesh becomes clogged with carbon deposits and oil sludge from blow-by gases, restricting airflow. A restricted breather causes pressure to build in the crankcase, which forces oil out through the path of least resistance — typically the front crankshaft seal (difficult to access behind the harmonic balancer and timing cover) or the rear main seal (requires transmission removal). When replacing the breather, always clean the breather hose or tube connecting to the intake — accumulated sludge in the hose can re-clog a new breather within hours. Inspect the hose for cracks or collapse — a collapsed breather hose blocks ventilation just as effectively as a clogged breather. On the 490B engine, the breather is located on the valve cover and is accessible without removing major engine components — making it a quick replacement item during routine maintenance.

Compatible with Xinchai 490B, 495, and 498 diesel engines in HELI, Hangcha, and Baoli forklifts. Browse our breather selection for other engine platforms. For engine specifications, visit Xinchai official website.

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100% original Xinchai. Clean breather hose during installation. Confirm your engine model →