MDE Unit 6 crank case Flashcards

Purpose of Relief Valves in Diesel Engine Crankcases

Question: Why are relief valves fitted to diesel engine crankcases?

C) To prevent excessive pressure buildup and avoid crankcase damage

Question 2: If the crankcase pressure is high, what should be checked to ensure proper sealing and pressure control?

B) Engine gaskets and seals

High Crankcase Pressure Implications and Actions

Question: If the daily engine log shows that the engine crankcase pressure gauge is indicating a much higher value than the normal reading, what are the implications and immediate actions that should be taken?

B) High crankcase pressure may indicate potential issues such as excessive blow-by or ventilation problems; immediately shut down the engine and inspect the crankcase ventilation system and seals.

Safety Detection System in Diesel Engine Crankcases

Question: What is a common safety detection system that may be fitted to diesel engine crankcases?

C) Crankcase pressure sensor

Question 4: What tool should be used to check for excessive blow-by gases that might be contributing to high crankcase pressure?

B) Cylinder compression tester

Crankcase Explosion Relief Door Components

Question: Which of the following lists the MAIN components of a crankcase explosion relief door?

A) Relief door, pressure spring, locking pin, and gasket

Question 3: What additional investigation should be conducted if crankcase pressure remains high despite checking the ventilation system and seals?

B) Examine the piston rings and cylinder walls for wear or damage

Question 5: What is a potential consequence of not addressing high crankcase pressure promptly?

C) Risk of engine damage and potential failure

Actions After Crankcase Oil Mist Detector Activation

Question: What actions should the on-watch engineer take when the engine crankcase oil mist detector activates?

B) Shut down the engine immediately and investigate the cause

Further Actions After Crankcase Oil Mist Detector Activation

Question: After shutting down the engine due to activation of the crankcase oil mist detector, what additional actions should the on-watch engineer take?

B) Check for signs of oil leaks and inspect the crankcase ventilation system

Checks and Investigations for Increased Crankcase Pressure

Question 1: What is the first step an engineer should take when investigating increased crankcase pressure?

B) Check the crankcase ventilation system for blockages or malfunctions

Circumstances Causing Relief Valves to Operate in Diesel Engine Crankcases

Question: Under what circumstances might relief valves in a diesel engine crankcase operate?

B) When there is excessive blow-by gas pressure or high crankcase pressure

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