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finals aamt 1-10 > powerplant AMT 1104 > Flashcards

powerplant AMT 1104 Flashcards

1
Q

are opened just before the piston reaches top dead center

A

Intake valves

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2
Q

remain open after top dead center.

A

exhaust valves

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3
Q

are open at the same time (end of the exhaust stroke and beginning of the intake stroke)

A

both valves

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4
Q

both determined by the shape of cam lobes

A

valve lift and valve duration

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5
Q

consists of a cam ring or camshaft equipped with lobes that work against a cam roller or a cam follower.

A

valve operating mechanism

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6
Q

is a circular piece of steel with a series of cams or lobes on the outer surface.

A

The cam ring

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7
Q

The surface of these lobes and the space between them (on which the cam rollers ride) is known as?

A

cam track

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8
Q

it causes the cam roller to raise the tappet in the tappet guide, thereby transmitting the force through the pushrod and rocker arm to open the valve.

A

lobes

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9
Q

As this revolves, the lobes cause the cam roller to raise the tappet in the tappet guide, thereby transmitting the force through the pushrod and rocker arm to open the valve.

A

cam ring

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10
Q

the cam ring is usually located between the propeller reduction gearing and the front end of the power section.

A

a single-row radial engine

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11
Q

in a single-row radial engine, usually located between the propeller reduction gearing and the front end of the power section.

A

cam ring

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12
Q

a second cam for the operation of the valves in the rear row is installed between the rear end of the power section and the supercharger section

A

twin-row radial engine

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13
Q

can be designed with teeth on either the inside or outside periphery

A

cam ring

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14
Q

it is necessary for the cam to rotate in the same direction as the crankshaft

A

Cam Rings

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15
Q

is driven by a gear that mates with another gear attached to the crankshaft.

A

camshaft

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16
Q

The valve mechanism of an opposed engine is operated by a what?

A

camshaft

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17
Q

always rotates at one-half the crankshaft speed

A

camshaft

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18
Q

as this revolves, the lobes cause the tappet assembly to rise in the tappet guide, transmitting the force through the pushrod and rocker arm to open the valve

A

camshaft

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19
Q

is to convert the rotational movement of the cam lobe into reciprocating motion and to transmit this motion to the push rod, rocker arm, and then to the valve tip, opening the valve at the proper time.

A

tappet assembly

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20
Q

is to take up the clearance between the rocker arm and the valve tip to reduce the shock load when the valve is opened.

A

tappet spring

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21
Q

is drilled through the tappet to allow engine oil to flow to the hollow pushrods to lubricate the rocker assemblies.

A

hole

22
Q

what are the tappet assembly consists of:

A
  1. A cylindrical tappet, which slides in and out in a tappet guide installed in one of the crankcase sections around the cam ring;
  2. A tappet roller, which follows the contour of the cam ring and lobes;
  3. A tappet ball socket or push rod socket; and
  4. A tappet springs.
23
Q

generally require the valve clearance to be adjusted manually by adjusting a screw and lock nut.

A

Solid lifters

24
Q

is needed to assure that the valve has enough clearance in the valve train to close completely.

A

Valve clearance

25
Q

This adjustment or inspection was a continuous maintenance item until hydraulic lifters were used.

A

Solid Lifters / Tappets

26
Q

Some aircraft engines incorporate to this that automatically keep the valve clearance at zero, eliminating the necessity for any valve clearance adjustment mechanism.

A

Hydraulic Valve Tappets / Lifters

27
Q

When the engine valve is closed, the face of the tappet body (cam follower) is on the base circle or back of the cam.

A

Hydraulic Valve Tappets / Lifters

28
Q

what lifts the hydraulic plunger so that its outer end contacts the push rod socket, exerting a light pressure against it, thus eliminating any clearance in the valve linkage.

A

light plunger spring

29
Q

As the plunger moves outward, the ball check valve moves off its seat. Oil from the supply chamber, which is directly connected with this, flows in and fills the pressure chamber.

A

engine lubrication system

30
Q

As the camshaft rotates, the cam pushes the tappet body and the hydraulic lifter cylinder outward.

A

As the camshaft rotates, the cam pushes the tappet body and the hydraulic lifter cylinder outward.

31
Q

This action forces the ball check valve onto its seat

A

Hydraulic Valve Tappets / Lifters

32
Q

the body of oil trapped in the pressure chamber acts as a cushion.

A

Hydraulic Valve Tappets / Lifters

33
Q

normally adjusted at the time of overhaul.

A

Hydraulic Valve Lifters

34
Q

They are assembled dry (no lubrication), clearances checked, and adjustments are usually made by using push rods of different lengths.

A

Hydraulic Valve Lifters

35
Q

A minimum and maximum valve clearance is established. Any measurement between these extremes is acceptable, but approximately half way between the extremes is desired.

A

Hydraulic Valve Lifters

36
Q

require less maintenance, are better lubricated, and operate more quietly than the screw adjustment type.

A

Hydraulic Valve Lifters

37
Q

tubular in form, transmits the lifting force from the valve tappet to the rocker arm.

A

push rod

38
Q

is pressed over or into each end of the tube.

A

A hardened-steel ball

39
Q

One ball end fits into the socket of the rocker arm. In some instances, the balls are on the tappet and rocker arm, and the sockets are on the what?

A

push rod

40
Q

is employed because of its lightness and strength.

A

tubular form

41
Q

It permits the engine lubricating oil under pressure to pass through the hollow rod and the drilled ball ends to lubricate the ball ends, rocker-arm bearing, and valve-stem guide.

A

push rod

42
Q

is enclosed in a tubular housing that extends from the crankcase to the cylinder head

A

push rod tubes

43
Q

transmit the lifting force from the cams to the valves.

A

rocker arms

44
Q

assemblies are supported by a plain, roller, or ball bearing, or a combination of these, which serves as a pivot.

A

rocker arms

45
Q

Generally, one end of the arm bears against the push rod and the other bears on the valve stem. One end of the rocker arm is sometimes slotted to accommodate a steel roller.

A

Rocker Arms

46
Q

The arm may have an adjusting screw, for adjusting the clearance between the rocker arm and the valve stem tip. The screw can be adjusted to the specified clearance to make certain that the valve closes fully.

A

rocker arm

47
Q

Each valve is closed by what?

A

two or three helical springs.

48
Q

it would vibrate or surge at certain speeds.

A

Vale Springs

49
Q

Each spring vibrates at a different engine speed and rapid damping out of all spring-surge vibrations during engine operation results.

A

engine operation results

50
Q
A
51
Q
A
52
Q
A

finals aamt 1-10 (2 decks)

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