ALTERNATOR GP-CHARGING 3661283 - Caterpillar

the crankcase breather is not maintained on a regular basis, the crankcase breather will become plugged. A plugged crankcase breather will cause excessive crankcase pressure that may cause crankshaft seal leakage.Perform this maintenance when the engine is stopped.
Illustration 1 g00788947
(1) Retaining bolt
(2) Hose clamp
Loosen retaining bolt (1).
Loosen hose clamp (2). Remove the breather assembly and the seal.
Wash the breather in clean nonflammable solvent. Allow the breather to dry.
Inspect the seal for good condition. Obtain a new seal, if necessary. Note: Coat the rubber parts with clean engine oil or petroleum jelly in order to make installation easier.
Install the seal and the breather in the original position. Tighten the hose clamp. For the proper torque, see this Operation and Maintenance Manual, "Torque Specifications" (Maintenance Section).Install the retaining bolt. For the proper torque, see the Service Manual, "Specifications" module.