Caterpillar Inc Seal Gp | 2457339

Caterpillar Inc Seal Gp | 2457339

Crankshaft seals retain engine oil and prevent external contamination from entering the engine oil system. Seals designed for dry applications (air-to-fluid interface) typically include a primary lip that prevents engine oil from leaking, and a dust lip. In wet applications (flu | to-fluid interface), the dust lip is replaced by an auxiliary lip capable of pumping external fluid away from the engine. Some seals have a plastic sleeve to aid in the installation process.