PULLEY-FAN 1850837 - Caterpillar

Symptom
Oil is leaking from the air compressor.Probable Cause
Damaged mounting gasketCheck the torque of the bolts that mount the air compressor to the engine. mounting bolts. Replace the gasket that is between the mounting flange of the air compressor and the engine. Tighten the bolts to the torque that is listed in the Specifications section.
Cracked crankcase or end coverInspect the exterior of the air compressor for components that are cracked or broken. Mounting bolts that are loose may cause the crankcase to crack. A cracked end cover can be caused by using too much torque to tighten fittings that connect to the end cover. Replace the air compressor or repair the air compressor, if necessary.
The end cover or the base plate is loose.Check the end cap bolts. Check bolts that fasten the base plate to the crankcase. Tighten the bolts, if necessary.
Leaking oil supply line or fittingsCheck the torque of the fittings. Tighten the fittings, if necessary. Check the oil line for damage. Replace the oil line, if necessary.
The casting of the air compressor is porous.Replace the air compressor if porosity is found.
The mounting flange gasket is missing or damaged.Replace the gasket, if necessary.
The O-ring for the end cover is missing or damaged.Replace the O-ring, if necessary.