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14 Cards in this Set
- Front
- Back
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What are the functions of the fuel injection pump? |
1) Boost the fuel pressure suff. to open the fuel injector nozzle 2) Deliver an equal quantity of fuel 3) Inject the fuel at the right moment 4) Vary quantity of fuel delivered 5) Controlling the engine speed and power |
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Name three contaminants effecting lube oil |
- Oxidation - Sludge - Acids |
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Name three types of air pumps? |
- Gearwheel - Plunger - Centrifugal |
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What is meant by valve timing? |
The adjusting of the valves to open and close at the proper time for the efficient operation of the engine |
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What is a four stroke cycle engine? |
The four stroke cycle engine is one in which four strokes of the piston are required to complete the events to create one power stroke |
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What is a cycle? |
A series of events repeated in a regular order to bring about the efficient operation of an engine |
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What is the function of the oil control ring? |
- Control amount of oil on the liner wall - Remove excess sludge |
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What two requirements cause a crankcase explosion? |
- A localised hot spot to produce ignition - A flammable vapour within the explosive range |
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What is the power stroke? |
The working stroke of the piston due to the expansion of gases to bring about the efficient operation of an engine. |
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How do cylinders receive fuel? |
- By having fuel-oil sprayed into them - By fuel pumps |
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What is scavenging? |
The removal of spent gases with a fresh charge of air |
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What is viscosity? |
The body or thickness of a fluids ability to flow. Measure by the time taken over a set distance at a certain temperature |
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What are the symptoms of too much valve clearance? |
- Valves open late and close early - Poor induction - Poor scavenging - Loss of power/efficiency - Black Smoke - Overheating |
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What are the symptoms of too little valve clearance? |
- Valves open early and close late - Loss of compression - Loss of power/efficiency - After burning in exhaust |
