Internal Combustion Engines
The fuel valve in a four stroke cycle diesel engine

Opens at 15° after top dead center and closes at 20° before bottom dead center
May open and close anywhere
Opens at top dead center and closes at bottom dead center
Opens at 15° before top dead center and closes at 20° after top dead center

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Internal Combustion Engines
Pour point of fuel oil is the

Minimum temperature to which oil is heated in order to give off inflammable vapours in sufficient quantity to ignite momentarily when brought in contact with a flame
Temperature at which it solidifies or congeals
It catches fire without external aid
Indicated by 90% distillation temperature i.e., when 90% of sample oil has distilled off

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Internal Combustion Engines
In a four stroke cycle diesel engine, the exhaust valve

Opens at 30° after bottom dead centre and closes at 10° before top dead centre
Opens at 30° before bottom dead centre and closes at 10° after top dead centre
May open and close anywhere
Opens at bottom dead centre and closes at top dead centre

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