WESPC U5LF0021 (U5LF0022) piston kit for Perkins 1004.40 1004.40T diesel engines

WESPC U5LF0021 (U5LF0022) piston kit for Perkins 1004.40 1004.40T diesel engines

Application

WESPC U5LF0021 (U5LF0022) piston kit for Perkins 1004.40 and 1004.40T diesel engines. Commonly used in FG Wilson generator sets, agricultural tractors, and construction machinery. Restores compression, oil control, and combustion efficiency during in-frame or major overhauls. Alloy piston with anodized crown and nitrided/chrome-faced rings ensures durability under sustained high-load operation.

Generator sets

Suitable for Perkins-powered gensets in the 1004.40/1004.40T range, delivering stable sealing and reduced oil consumption in both prime and standby duty cycles.

Industrial & agricultural equipment

Applied in Massey Ferguson tractors, telehandlers, and other OEM platforms using Perkins 1004 Series engines. Graphite-coated skirt reduces friction; ring pack maintains sealing under heavy-duty cycles.

Technical specifications

Part number: U5LF0021 (superseded by U5LF0022 in some Perkins service references)

Function: piston kit (piston, rings, pin, circlips)

Material: alloy piston with anodized crown; ductile cast iron rings with nitrided top and chrome oil control

Compatible engines: Perkins 1004.40, 1004.40T

Bore size: standard (100.00 mm)

Warranty: 12 months

Interchange part number

U5LF0021; U5LF0022; verified fitment for Perkins 1004 Series engines in FG Wilson gensets and industrial/agricultural machinery

WESPC(Dongguan)Tech Co., Ltd. is a wholly-owned subsidiary of WESPC Hong Kong.

The company has long been deeply engaged in the Perkins aftermarket spare parts sector, while also covering a wide range of multi-brand engines and related components. With years of professional expertise and a solid reputation, WESPC provides customers with diverse, one-stop solutions tailored to their needs.

Leveraging the global vision of its Hong Kong headquarters and the strategic location advantages of Dongguan, WESPC Dongguan is committed to building a highly efficient and reliable supply chain system, supported by professional technical expertise and comprehensive after-sales services, to continuously create greater value for its customers.

Looking ahead, the company will continue to expand its business landscape, keep pace with industry trends, and consistently enhance product and service quality—working hand in hand with global partners to achieve mutual growth and success.