Which of the following is TRUE?____. A: If there is oxygen and fuel in an enclosed tank, there must be an explosion. B: Crankcase explosion is least likely to occur, because there is no air in crankcase. C: The droplets of lubricating oil splashing around in the crankcase is usually too large to start burning. D: The oil/air concentration in crankcase is usually too rich.

The cast iron guide-ways for （） are attached to the top section and seal off the crankcase.

If a crankcase explosion occurs in a diesel engine, you should stop the engine and（） A: immediately open all crankcase relief ports B: increase crankcase exhauster speed to draw cool air into the engine C: allow the engine to cool naturally D: increase crank case scavenge air to remove unburned gase

The crankcase cover should never be allowed to open for investigation when （）

The crankcase can not be opened （）the parts have been cooled down.

Cylinder block contains ________, coolant and lubricant passages and crankcase. A: cylinder head B: cylinders C: pistons D: crankshaft

Put in the engine turning gear Now examine thoroughly inside the crankcase to （） that everything is correct.

In a normally operating diesel engine， the main cause of lubricating oil contamination in the crankcase is a result of the （）.

Whilst the engine is turning， check to see that no water is leaking into the crankcase， scavenge air belt， or from （）.

It is held in the crankcase in the cylinder block and converts the reciprocating motion of the pistons into a rotary motion for the drive wheels．