ALTERNATOR GP -B 0R3652 - Caterpillar

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(1) Closed Crankcase breather (Optional)
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(2) Open Crankcase breather (Standard) The crankcase breather helps to prevent a buildup of pressure in the crankcase. Some of the oil from the fumes that are produced in the crankcase is collected in the breather elements. In an Open Crankcase Ventilation (OCV), the fumes are then vented into the atmosphere. In a Closed Crankcase Ventilation (CCV), the fumes are routed to the turbocharger compressor inlet.The crankcase breather helps to prevent a buildup of pressure in the crankcase. Some of the oil from the fumes that are produced in the crankcase is collected in the breather elements. The fumes are exhausted into the atmosphere.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 breather elements may be cleaned.
Keep all parts clean from contaminants.Contaminants may cause rapid wear and shortened component life.
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting, and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids.Refer to Special Publication, NENG2500, "Cat Dealer Service Tools Catalog" for tools and supplies suitable to collect and contain fluids on Cat products.Dispose of all fluids according to local regulations and mandates.
Cleaning the Crankcase Breathers
Open Crankcase Ventilation (OCV)
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(1) Bolt
(2) Clamp
(3) Tube
(4) Breather
Loosen clamp (2). Slide the clamp onto tube (3).
Remove bolts (1) and the retainers.
Remove the breather.
Clean the breather elements with clean, nonflammable solvent. Turn the breathers upside-down in order to inspect the condition of the breather elements. If the breather elements remain contaminated after the cleaning, discard the breathers and obtain new breathers. Do not attempt to disassemble the breathers.Allow the breather elements to dry before installation.
The breather has a rubber gasket that is a part of the unit. Coat the gasket with clean engine oil.
Reinstall breather (4), the retainers, and bolts (1). For the proper torque, refer to the Service Manual, "Specifications".
Place hose (3) on the breather. Slide the clamp into the proper position and tighten. For the proper torque, refer to the Service Manual, "Specifications". Closed Crankcase Ventilation (CCV)
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Loosen clamps (5). Slide the clamp onto tubes.
Remove the breather (6).
Clean the breather elements with clean, nonflammable solvent. Turn the breathers upside-down in order to inspect the condition of the breather elements. If the breather elements remain contaminated after the cleaning, discard the breathers and obtain new breathers. Do not attempt to disassemble the breathers.Allow the breather elements to dry before installation.
The breather has an O-ring seal that is a part of the unit. Coat the seal with clean engine oil.
Reinstall breather (6).
Slide the clamps into the proper position and tighten. For the proper torque, refer to the Service Manual, "Specifications".