DISC 6A6486 - Caterpillar

Perform this maintenance with the engine stopped.
If 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.The crankcase breather consists of two components:
A breather assembly that is located underneath the valve cover that is at the rear of the engine
A breather hose that connects the breather assembly to the outside air beneath the engine
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Typical Routing of Breather Hose
(1) Rear Valve Cover (2) Hose Clamp (3) Breather Hose
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Top View After Removal of Valve Cover
(4) Bolt Hole (5) Breather Assembly (6) Access to Hose
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Side View of Valve Cover and Breather Elements
(7) Bolt (8) Breather Elements (9) Seal Use the following procedure in order to clean the breather assembly:
Remove the six bolts that attach the valve cover to the engine. Remove the valve cover.
Loosen the clamp that attaches the breather hose to the breather assembly and remove the breather assembly.
Check the condition of the seal. Replace the seal if the seal is damaged.
Remove both of the breather elements. Wash the breather elements and the breather in clean nonflammable solvent.
Shake the breather elements until the breather elements are dry. You may also use pressurized air in order to dry the breather elements.
Install the elements into the breather and install the breather assembly onto the engine.
Install the hose onto the access for the breather, and tighten the clamp around the hose. Replace the valve cover on the engine, and install the six bolts. Consult Specifications, SENR3130, "Torque Specifications" in order to obtain correct instructions for installing the hose clamp and the bolts.