Question
Download Solution PDFWater sludge is formed in the crankcase due to the mixing of which of the following?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Sludge Formation:
- In the Crankcase, water collects in two ways:
- Water formed as a product of combustion and water entering because of crankcase ventilation.
- Water mixed with oil when churned up, leads to the formation of sludge.
- This prevents normal circulation of oil to the engine parts.
- The problem of sludge formation is more acute When the engine runs for a too short period of time.
- In such cases, the oil may have to be changed more frequently.
- In the engine running for a considerable period of time, the crankcase ventilation takes care of the sludge formation.
Crankcase ventilation:
- In the crankcase oil gets diluted due to the mixture of blow-by gases, carbon particles, metallic particles, sand, dust, dirt, and the acids formed out of the exhaust gas condensation such as sulphuric acid and phosphoric acid.
- This affects lubrication and forms sludge (accumulation of dirty oil).
- Frequent cleaning and change of oil are needed.
- To overcome this problem, crankcase ventilation is provided.
- Fresh air is allowed in the crankcase which passes out after circulation through a breather pipe (1) in the rear.
- This arrangement is known as open-type crankcase ventilation.
- In earlier vehicles, crankcase vapors were vented directly to the atmosphere through a breather tube, or road draught tube.
- It was shaped to help draw the vapors from the crankcase, as the vehicle was being driven.
- Modern vehicles are required to direct crankcase breather gases and vapors back into the inlet system to be burned.
- A general method of doing this is called positive crankcase ventilation, or PCV.
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