Auto
In typical gasoline-powered automobile engine, how many piston strokes make up a complete cycle?
Four
The length of a valve spring when removed from the engine is called the_____length.
Free
Distance measured from ring land to back of ring groove.
Ring groove depth.
Distance measured from top to bottom of ring groove.
Ring groove width.
_______is another name used to describe the engine bottom end.
Short block
Distance from bottom of skirt to centerline of pinhole.
Skirt length.
Which of the following methods is used to secure a full-floating piston pin in the piston?
Snap rings
Highest point of piston travel.
TDC
Time when both the intake and exhaust valves in the same cylinder are open.
Valve overlap
Valve opening and closing in relation to the position of the pistons in the cylinders.
Valve timing
A head with all its parts removed is called a(n)___________cylinder head.
bare
Any vehicle engine that is not an internal combustion, four-stroke cycle, reciprocating piston type is classified as a(n)_____engine.
alternative
The engine main______are removable inserts that fit between the crankshaft main journals and the block main bore.
bearing
The engine main_________are removable inserts that fit between the crankshaft main journals and the block main bore.
bearings
A(n)_________overhead cam engine has two camshafts per cylinder head.
dual
The piston is mounted to the connecting rod by the_______.
wrist pin
Hydraulic valve lifters operate quietly because they maintain_______valve clearance.
zero
Pistons typically use_____compression rings and one oil ring.
2
The______cycle engine requires only one revolution of the crankshaft for each power-producing cycle.
2-Stroke
Which of the following valve face angles is normally found in passenger car engines?
45
Lowest point of piston travel.
BDC.
While discussing engines, Technician A says two-stroke engines are not used in vehicles because they produce too much exhaust pollution. Technician B says two-stroke cycle engines are not used in vehicles because they have poor power output at low speeds. Who is right?
Both A and B.
Precision-machined and polished surfaces that control valve movement.
Cam lobes
How long the valve stays open.
Camshaft duration
Distance the valve opens.
Camshaft lift.
Which of the following is not a common way to classify engines?
Carburetor design
Distance from centerline of pinhole to top of piston.
Compression distance.
A(n)______changes the engine cylinders' up-and-down motion into a rotating motion.
Crankshaft
Removes burned gases from engine.
Exhaust stroke
Clears burned gases from cylinder.
Exhaust stroke.
A three-valve combustion chamber typically has one intake valve and two exhaust valves.
False
An intake valve is usually smaller than an exhaust valve.
False
In a four-stroke cycle engine, the crankshaft must make four complete rotations to complete the cycle.
False
Opening of the engine's valves is controlled by the crankshaft.
False
Rocker arms connect the camshaft to the push rods.
False
The crankcase is the upper part of the engine block, where the valves are located.
False
Two-stroke cycle engines are as fuel-efficient as four-stroke cycle engines.
False
Valve springs are used to open an engine's intake and exhaust valves.
False
Engine operation is smoothed by the large________ mounted on the rear of the crankshaft.
Fly wheel
Push rods transfer motion from the_______to the rocker arms.
Lifter
Which of the following is not a metal that is plated over a steel backing for use as an engine bearing?
Magnesium.
Which of the following is not part of an engine?
Muffler
A timing belt, gears, or a chain drives the engine's camshaft at________the rotation speed of the crankshaft.
One-half
Valve______is the time when both of the valves in a cylinder are open
Overlap
Distance measured across inside of hole for piston pin.
Pin hole diameter
The connecting rod small end is attached to the_______by a wrist pin.
Piston
Distance measured across sides of piston.
Piston diameter
Results in (180 rotation of crankshaft
Piston stroke.
Valves close off the intake and exhaust______for each engine cylinder.
Ports
Caused by ignition of air-fuel mixture
Power stroke.
The valve_______controls the opening and closing of the cylinder head ports.
Train
A crank damper helps prevent crankshaft vibration.
True
A valve guide that is part of the cylinder head casting is called an integral valve guide
True
An umbrella valve seal is shaped like a cup and keeps oil from being drawn into the cylinder head port and combustion chamber.
True
Each piston has two compression rings and one oil ring.
True
Mechanical (solid) valve lifters produce a clatter, or clicking noise, as the valves operate.
True
Slant engines and V-type engines allow lower hood lines than inline engines.
True
Stellite valves have a special hard coating to prolong their service life.
True
The combustion chamber is located directly above the piston.
True
The flywheel contains a small ring gear, which is used to start the engine.
True
To prevent carbon buildup on the valve face, a valve rotator is often used.
True
The opening of an engine's valves is controlled by the_________.
camshaft
_______rings prevent combustion pressure from leaking into the engine's crankcase.
compression
Squeezes trapped fuel mixture.
compression stroke
Draws air-fuel mixture into combustion chamber.
intake stroke
The______machined on the camshaft are used to open each valve as the engine operates.
lobes
An inline engine has______bank(s) of cylinders.
one
Produces energy to operate engine.
power stroke
A(n)______rod transmits motion from the lifters to the valve rocker arms.
push
The intake manifold on a fuel-injected engine contains passages called______to route the fuel mixture to each cylinder.
runners
The piston is mounted to the connecting rod by the_____.
wrist pin
What is the purpose of the compression rings used on pistons?
to hold Combustion Pressure in top of Piston
In a cam-in-block engine, the part of the valve train riding directly on the cam is the_______.
valve lifter
