C3963988 XCMG GR2605 motor grader sealing washer

C3963988 is an original equipment manufacturer (OEM) sealing washer (also known as a crush washer) for Cummins engines. As a basic sealing component in fuel and lubrication systems, it is made of soft metal. When compressed, it deforms slightly to fill microscopic gaps, preventing leaks of fluids like diesel and engine oil while blocking air and contaminants from entering the system. It is critical for ensuring reliable interface sealing and maintaining stable system pressure.

Part Number: C3963988
Type: Sealing Washer / Crush Washer
Compatible System: Cummins electronic controlled high-pressure common rail fuel system and lubrication system
Core Specifications: Designed for high-pressure fuel line/interface sealing; specific dimensions refer to original factory drawings
Sealing Material: Soft metal (easily deformed under pressure for tight seal)
Superseded Part Numbers: 3935172, 3937155
Weight: Approx. 0.001kg (per piece)

Applicable Engines: Cummins 4B3.9, 6B5.9, ISB3.9, ISB4.5, QSB3.9, QSB4.5, B6.7 series electronic controlled engines
Equipment: Commercial vehicles (Dongfeng Tianlong, Tianjin, Foton Auman, Shacman Delong heavy-duty trucks), construction machinery (Komatsu, Sany, XCMG excavators/loaders/motor graders), Cummins B/QSB series industrial generator sets
Installation Location: At engine fuel line interfaces, fuel block interfaces, and high-pressure connections such as fuel pumps/filters, used for sealing between two metal contact surfaces