@segundojazz
Esto te interesa. Es un boletín de servicio del TIS de BMW para diagnosticar la CCV, con las causas y las consecuencias. Está en inglés, a ver si
@Eduma lo tiene en español:
https://static.nhtsa.gov/odi/tsbs/2013/SB-10038217-8356.pdf
TIS SI B11 03 08
SUBJECT
Crankcase Ventilation System Diagnosis and Measurement
MODEL
All
INFORMATION
All current BMW engines incorporate a pressure-controlled crankcase ventilation system. The crankcase ventilation systems use various different crankcase ventilation valves, depending on the engine type. Although the valves all look different, they function similarly, using a spring and diaphragm assembly to control the crankcase pressure. A properly functioning pressure control valve is designed to maintain a slight vacuum (under-pressure) in the crankcase, which assures reliable crankcase venting during all engine operating conditions. Some of the causes and results of a
malfunctioning crankcase ventilation system are listed below.
Causes of Excessive Overpressure (Pressure)
Internal engine damage/wear
Obstruction in the crankcase ventilation system
Defective pressure control valve(s)
Results of Excessive Overpressure
Damage to the engine oil seals
Increased engine oil consumption (can be misdiagnosed as a defective turbocharger)
Excessive engine oil in the intake system
Excessive engine oil in the charged intake tubes or the intercooler on turbocharged engines (can be
misdiagnosed as a defective turbocharger)
Engine oil dip stick is dislodged from the guide tube (if equipped)
Cause of Excessive Under-pressure (Vacuum)
Defective pressure control valve
Results of Excessive Under-pressure
Damage to the engine oil seals
Increased engine oil consumption
Excessive engine oil in the intake system
Rough engine idling or engine misfire
Whistling or howling noise from the engine (can be misdiagnosed as a defective turbocharger)
Increased mixture adaptation values
También del TIS tengo esto:
TIS
7 SI Techniques > 11 Engine (M43TU) > 2 SBT Vacuum Supply All Models
11 02 05 (130)
Suministro de vacío
Todos los modelos
Introducción
Aspiración de los gases Blow-By del cárter de cigüeñal
La purga de aire del motor permite purgar con vacío los gases Blow-By del bloque del motor.
Los gases Blow-By corresponden a la reducida parte de la admisión del cilindro que llega al cárter de cigüeñal en la compresión, después de atravesar el segmento. Si los gases Blow-By no se eliminaran del bloque de motor mediante la purga de aire del motor, se acumularían en el cárter de cigüeñal. De ese modo se comprimirían desde abajo contra los pistones. Eso impediría el movimiento ascendente de los pistones en la carrera de aspiración y en el ciclo de trabajo.