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Mechanics
Chpt. 15 Engine Front End Construction
| Question | Answer |
|---|---|
| 15 Define harmonic vibration | a high-frequency movement resulting from twisting and untwisting of the crankshaft |
| 15 What can happen if harmonic vibration is not controlled in an automotive engine? | serious engine damage such as a broken crankshaft |
| 15 What device(s) controls harmonic vibration? | vibration damper or harmonic balancer |
| 15 What does the crankshaft pulley operate? | water pump, alternator, air conditioning compressor, and other units |
| 15 What is the function of the camshaft drive? | transfers the rotational motion of the crankshaft to the camshaft |
| 15 What type of cam drive is used for heavy-duty applications such as taxi cabs or trucks? | timing gears |
| 15 Define cam drive timing marks? | show the techinian how to install the gears properly |
| 15 What is the most common type of camshaft drive arrangement used on cam-in-blocks engines? | timing chain and sprockets |
| 15 What is it called when the timing chain flaps back and forth because of excessive slack in the chain? | chain slap |
| 15 What is used to take up the slack in the camshaft chain as it and the sprockets wear? | chain tensioner |
| 15 What is the purpose of an auxillary chain? | to drive the engine oil pump, balancer shafts and other units on the engine |
| 15 Describe the function of an engine front cover? | encloses the timing chain or gear mechanism and prevents oil leakage from the front of the engine |
| 15 Where does the engine front cover bolt to? | engine block |
| 15 What seal prevents oil leakage between the crankshaft and the front cover? | front oil seal |
| 15 Explain the function of an engine's front end oil slinger? | helps lubricate the timing mechanism and blocks the oil from striking the front seal, preventing leakage |
| 15 What four components make up a timing belt drive mechanism? | cranskshaft sprocket, camshaft sprocket, timing belt, belt tensioner |
| 15 What provides a very smooth and accurate method of turning the camshaft? | timing belt |
| 15 What is a spring-loaded wheel that keeps the timing belt firmly seated on its sprockets? | belt tensioner |
| What else may a timing belt be used to drive? | diesel injection pump, water pump, oil pump |
| Describe the function of a timing belt cover? | protects the belt from damage and the technician from injury |
| What is a timing belt cover normally made of? | sheet metal or plastic |
| Does a timing belt cover serve the same function as an engine front cover? | NO |
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mechanics
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