This sealing washer sits between two engine components to prevent fluid or gas leakage at the joint. It is installed at a bolted interface on the engine block or cylinder head, where it compresses under fastener torque to fill microscopic surface irregularities. A worn or hardened washer allows seepage past the joint, which can lead to a gradual loss of coolant, oil, or compression. The washer is manufactured to AGCO's original material specification, which matches the crush and recovery characteristics required for the joint to remain sealed across the engine's operating temperature range. On reinstall, fit a new washer and tighten the fastener to the specified torque.