Hangzhou XC Machinery Co., Ltd. supplies aftermarket-new Cummins 4BT engine parts for D250, D350 and W250 excavators. This listing covers the exhaust valve references 3970727 and 3803529, together with related 4BT engine spare parts used during top-end and lower-end service.
Key details
The exhaust valve is a critical component in the 4BT cylinder head. It controls exhaust gas flow out of the combustion chamber and must seal correctly at high temperature. Replacing worn or damaged valves helps maintain compression, reduce blow-by and support stable engine output.
These parts are offered as aftermarket-new replacements for the listed Cummins 4BT applications. They are intended for repair, overhaul and maintenance projects where the original valve has reached the end of its service life.
Alongside the exhaust valve, we can supply a range of 4BT engine components for the same machine models:
These items are commonly ordered together for engine rebuilds, top-end overhauls and preventive maintenance. If you are planning a full service, combining related parts can reduce downtime and help ensure correct fit between components.
The parts listed here are associated with Cummins 4BT engines installed in D250, D350 and W250 excavators. Always confirm your engine serial number and existing part number before ordering to ensure the correct match for your machine.
Hangzhou XC Machinery Co., Ltd. is a China-based parts wholesaler serving the construction equipment industry for over 8 years. We supply excavator hydraulic pumps and parts, engine parts, undercarriage parts, electric parts, seal kits, filters, final drive and gear parts, hydraulic breakers, rock buckets and scanner diagnosers.
We serve customers worldwide, including the US, Canada, Turkey, Italy, Brazil, Colombia, South Africa, UAE and India. Our range includes OEM and genuine parts for South Korean brands such as Daewoo, Doosan, Hyundai, Volvo and Samsung; Japanese brands such as Komatsu, Hitachi, Kobelco, Kato, Isuzu and Mitsubishi; and Chinese brands such as SDLG, SANY, Zoomlion and Liugong.
Please provide the part number, engine model and machine model when requesting a quote. For the exhaust valve, the relevant references are 3970727 and 3803529. If you need a complete set of related 4BT parts, let us know which items from the list above you require.
We stock a variety of quality parts and can assist with identifying the correct components for your D250, D350 or W250 excavator.
WhatsApp / Phone: +86 136 4581 9133
Skype: robinwanguuu@hotmail.com
Email: Ricardo@xcgparts.com
WeChat: welchanparts_luke
Website: www.xcgparts.com
This product is an aftermarket-new Cummins 4BT exhaust valve, available under part numbers 3970727 and 3803529, intended for D250, D350 and W250 excavators. The exhaust valve is a cylinder-head component that controls exhaust gas flow and must seal correctly at high temperature. It is supplied for repair, overhaul and maintenance where the original valve has reached the end of its service life. Related 4BT engine spare parts such as liner kits, piston ring kits, snap rings, main bearings, valve guides, intake valves and gasket kits are also available.
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