vibration damper construction Flashcards
define harmonic vibration
its a high frequency movement sefulting from twisting and un twisting of the crankshaft
what can happen if harmonic vibration is not controlled in an automotive engine?
it can flex or bend the crankshaft
what device controls harmonic vibration?
vibration damper or harmonic balancer
identify the parts of the vibration damper illistrated below
a- inertia ring
b- rubber ring
c- sleeve
d- crankshaft pulley
the crankshaft —— operates belts for the alternator, water pump, air conditioning compressor and other units
pulley
what is the function of the camshaft drive?
transfers the rotational motion of the crankshaft to the camshaft
an —– cam drive is commonly used for heavy duty applications, such as taxicabs or trucks
timing gear
define cam drive timing marks
they show technitians how to install the gears properly
what is the common type of camshaft drive arrangment used on cam-in-block engines?
a timing chain and sprockets
—- occurs when the timing chain flaps back and forth because of excessive slack in the chain
chain slap
an —– may be used to take up the slack in the chain as it and the sprockets wear
chain tensioner
what is the purpose of an auxiliary chain?
may be used to drive the engine oil pump
describe the function of an engine front cover
encloses the timing chain or gear mechnisim and prevents oil leakage from the front of the engine
an engine front cover bolts to the——
front of the engine
an —– prevents oil leakage between the crankshaft and the front cover
front oil seal
explain the function of an engines front end slinger
lubricates the timing mechinism and blocks the oil from striking the front seal, preventing leakage
what basic componets make up a timing belt drive mechinism
consists of a crankshaft sprocket, camshaft sprocket, timing belt and a belt tensioner
an —- provides a very smooth and accurate method of turning the camshaft
timing belt
a —- is a spring-loaded wheel that keeps the timing belt firmly seated on its sprockets
belt tensioner
a timing belt may also be used to drive the —
a- diseal pump injection
b- water pump
c- oil pump
d- all of the above
describe the functin of a timing belt cover
simply protects the belt from damage and the techniian from injury
what is a timing belt cover usually made out of
sheet metal or plastic
true or false?: a timing belt cover serves the same function as an engine front cover
false
