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Mechanics

Chpt. 11 Modes, Mechanisms, and alternate fuel

QuestionAnswer
In the engine, what does preignition cause? pinging
What rating does a diesel fuel have to ignite in cold weather? cetane
What is a vehicle called that can operate on different types of fuel? Flexible fuel
Does diesel fuel vaporize as easily as gasoline? NO
What is a fuel cell an example of? electrolysis in reverse
In the future what might recycled aluminum be used for? auto bodies
What system permits rapid location of stolen or hijacked vehicles? Vehicle tracking system
How does a fuel cell system work? produces electrical energy by combining hydrogen and oxygen
11 Why is an automotive engine called a power plant? because it is the source of power for the vehicle
11 What is the hollow area between the top of the piston and the bottom of the cylinder head called? combustion chamber
11 Tell who an engine converts fuel into a useful form of energy. combustion pressure forces the piston down by linking the piston to the crankshaft.
11 What can a rotating crankshaft be used for? drive gears, chains and sprockets, belts and sprockets and other drive mechanisms
11 What is a piston stroke? the distance the piston slides up or down from TDC/BDC.
11 Name the four strokes of an automobile engine. 1. intake 2. compression 3. power 4. exhaust
11 How many times must the crankshaft rotate to complete the four stroke cycle? Two complete revolutions
11 Name the main body of the engine engine block or cylinder block
11 Describe what cylinders look like. large, round holes machined through the block from top to bottom
11 Define deck surface. the top of the block surrounding the cylinders
11 What are water jackets? are coolant passages through the block that allow a solution of water and antifreeze to cool the cylinders
11 What are main bearing bores? holes machined in the bottom of the block to hold the crankshaft.
11 Describe what main caps do. bolt to the bottom of the block and hold the crankshaft and main bearing inserts in place
11 What part changes the up-and-down motion of the pistons into a rotating motion? crankshaft
11 What is the purpose of crankshaft counterweights? prevent engine vibrations
11 What is the function of the crankshaft flange? holds the engine flywheel
11 What provides a mounting place for the camshaft drive mechanism, front damper, and fan belt pulleys? crankshaft snout
11 Engine main bearings are inserts that fit between ______and _____. block main bore and crankshaft main journals
11 List three functions of an engine fly wheel. 1. connects the engine crankshaft to the transmission or trans-axle. 2. helps smooth engine operation for a vehicle with a manual transmission 3. start the engine(using large ring gear)
11 How many pieces can an engine's rear main oil seal be in? one or two
11 What is main bearing clearance? the space between the crankshaft main journal and the main bearing insert
11 What limits the distance the crankshaft can slide forward or rearward in the block? main thrust bearing
11 What is the small space between the rod bearing and crankshaft journal? rod bearing clearance
11 Describe the purpose of an engine piston transfers the pressure of combustion to the connecting rod and crankshaft.
11 Name six part of an engine piston 1. piston head 2. piston ring grooves 3. piston oil holes 4. piston ring lands 5. piston skirt 6. piston boss 7. piston pin 8. piston clearance
11 What do piston rings do? keep combustion pressure from entering the crankcase and keep oil out of the combustion chamber
11 What is engine top end? refers to the cylinder heads, valves, camshaft and other related components.
11 Combustion chambers small pockets formed in the cylinder heads
11 Describe intake ports purpose? route air or air and fuel into the combustion chambers
11 What components make up an engine valve train? camshaft, lifters, push rods. rocker arms, valves, valve spring assemblies
11 Describe the function of the engine valve train? open and closes the valves at the correct time
11 Where is an engine camshaft located? in the engine block or in the cylinder head
11 Valve Lifter (tappet) does? rides on the cam lobes and transfers motion to the rest of the valve train.
11 Push rods transfer motion between the lifters and the rocker arms
11 Which is usually larger, the intake valve or the exhaust valve? intake valve
11 Define Value face the machined surface on the back of the valve head. It touches and seals against the seat in the cylinder head.
11 What is a valve stem long shaft extending out of the valve head.
11 What is the function of valve seals? prevent oil from entering the combustion chambers through valve guides
11 Where do fuel injectors and throttle body mount on, on late model engines? intake manifold
11 What is the function of an exhaust manifold? carries burned gases into the exhaust system
11 What is a thin metal or plastic cover over the top of the cylinder head? valve (rocker)
11 What four parts are attached to the engine front end? camshaft drive, front cover, oil seal, crank damper
11 What is a camshaft drive needed to do? turn the camshaft at one half engine speed
11 What is the purpose of an automotive engine s crank damper? prevents crankshaft vibration and damage
Created by: mechanics
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