Question

The positive crankcase ventilation system helps:

• A. To redirect the blow by gases in the crankcase to inlet manifold
• B. To reduce the atmospheric pollution caused by the engines
• C. To prevent oil dilution and sludge formation
• D. All of the above

Answer 1

Answer:

D. All of the above

• The Positive Crankcase Ventilation (PCV) system is a crucial emission control system in modern vehicles that serves multiple important functions:

• Primary Functions:

  1. Redirects Blow-by Gases: The PCV system redirects harmful blow-by gases from the crankcase back to the intake manifold, where they can be burned in the combustion chamber instead of being released into the atmosphere.

  2. Reduces Atmospheric Pollution: By preventing the release of unburned hydrocarbons and other harmful gases into the environment, the PCV system significantly reduces air pollution caused by engines.

  3. Prevents Oil Dilution and Sludge Formation: The system helps maintain proper crankcase ventilation, which prevents moisture buildup and contamination that can lead to oil dilution and sludge formation. This protects engine components and extends oil life.

• How it Works:
  The PCV system uses engine vacuum to draw blow-by gases from the crankcase through a PCV valve into the intake manifold. This creates a controlled ventilation process that maintains proper pressure in the crankcase while ensuring harmful gases are properly burned rather than released.

• Since the PCV system accomplishes all three functions mentioned in options A, B, and C, the correct answer is Option D - "All of the above."