XinChai 4D35ZG31 Engine Breather 4D35ZG31-34100 — Forklift Diesel Crankcase Respirator, OEM Quality Iron-Plastic

This is the engine breather — also called crankcase respirator or crankcase ventilation assembly — for the XinChai 4D35ZG31 diesel engine (part number 4D35ZG31-34100). The 4D35ZG31 is a later-generation member of the Xinchai 4D series diesel engine family, used in Chinese forklifts and industrial equipment as an evolution of the 490B/495 platform with updated emissions control and breather system design. The breather’s function is critical: it vents blow-by gases from the crankcase to the intake manifold while separating oil mist from the ventilation gases, preventing crankcase pressure buildup. On a diesel engine under full load at 2,600 RPM, blow-by — the small amount of high-pressure combustion gas that leaks past the piston rings into the crankcase on every power stroke — accumulates as a continuous volume of gas that must be vented or the crankcase will pressurize. A clogged or restricted breather forces that pressurized gas to escape through the path of least resistance: the front crankshaft seal (pushing the seal lip out of contact with the harmonic balancer hub), the rear main seal (requiring transmission removal to access), the valve cover gasket (leaking oil onto the hot exhaust manifold), and even the dipstick tube (blowing the dipstick out and spraying oil across the engine bay). Pressurized crankcase oil leaks are the most common root cause of repeat seal failures — a seal replaced without diagnosing and clearing the clogged breather will fail again within hours.

This XinChai brand breather is manufactured in Jiangsu, China with 23 years of modification experience behind its design. Iron and plastic construction for durability and weight savings, direct adaptation fit — no modification required for installation on the 4D35ZG31 engine. 1kg weight, box packing. 3-month warranty with online guidance service included. Purpose: repair, replacement, or modification. Video outgoing-inspection provided. When replacing the breather on the 4D35ZG31, always clean or replace the breather hose connecting to the intake manifold — the old hose accumulates years of oil sludge and carbon deposits that will re-clog a new breather within hours of installation if not cleaned. Inspect the hose for cracks, collapse, or kinking — a collapsed breather hose blocks ventilation just as thoroughly as a clogged breather. The breather is mounted on the valve cover and is accessible from the top of the engine without removing other components, making it a quick service item that should be inspected during every oil change. A simple test: remove the breather and blow through it — resistance or blockage indicates it needs replacement. Also check for oil residue around the breather housing seam — oil weeping from the breather body indicates the internal oil separator baffle has failed.

Compatible with XinChai 4D35ZG31 diesel engines in forklifts and industrial equipment. Browse our breather selection for Xinchai 490B 495B-34000-2 and 490B-340100 high-efficiency variants. For engine specifications, visit Xinchai official website.

Technical Specifications

Compatible Models

23 years experience. Direct fit. Clean breather hose during installation. Confirm your engine model →