AMT 2203 OVERHAUL

What is the primary function of induction manifold?

A. distributes air, sometimes mixed with fuel, to the cylinders.

B. a device that generates electrical energy to ignite the fuel/air mixture.

C. measures the quality of combustion chamber sealing.

What is the primary function of induction manifold?

A. distributes air, sometimes mixed with fuel, to the cylinders.

B. a device that generates electrical energy to ignite the fuel/air mixture.

C. measures the quality of combustion chamber sealing.

A. distributes air, sometimes mixed with fuel, to the cylinders.

In a carbureted engine, how is fuel introduced?

A. through fuel injection nozzle.

B. direct injection of fuel to the cylinder.

C. by mixing fuel and air in induction manifold.

C. by mixing fuel and air in induction manifold.

If there is a leak in the induction manifold, what will be the outcome?

A. it introduce excess fuel causing a rich mixture.

B. it reduce the air flow resulting in a lean mixture.

C. it introduce excess air, causing a lean mixture.

D. it has no effect to the fuel and air mixture.

C. it introduce excess air, causing a lean mixture.

A very rich mixture is often required to _____________________.

A. start a cold engine.

B. start a hot engine.

C. all of the above.

A. start a cold engine.

An ignition system consists of two magnetos, an _________________, and a ___________________.

ignition harness, and a set of spark plugs.

What is the primary function of a magneto?

A. distributes air, sometimes mixed with fuel, to the cylinders.

B. a device that generates electrical energy to ignite the fuel/air mixture.

C. measures the quality of combustion chamber sealing.

B. a device that generates electrical energy to ignite the fuel/air mixture.

A magneto generates _________,

A. High Voltage

B. Low Voltage

A. High Voltage

The _____________ consists of a set of insulated and shielded high-voltage leads that transmit the impulses from the magneto distributor to the spark plug.

A. Magneto wirings.

B. Battery

C. Ignition Harness

C. Ignition Harness

The most common ignition harness defect, and most difficult to detect, is___________________.

high-voltage leakage

The most common ignition harness defect, and most difficult to detect, is high-voltage leakage. A ____________________ is used to perform this check.

special harness tester

What is the primary function of a compression testing?

A. distributes air, sometimes mixed with fuel, to the cylinders.

B. a device that generates electrical energy to ignite the fuel/air mixture.

C. measures the quality of combustion chamber sealing.

C. measures the quality of combustion chamber sealing.

A cylinder with good compression provides ___________ than one with low compression.

more power

Leaking valves tend to be the most common cause of _______________.

cylinder leaks.

Sometimes _______________ results from excessive wear of piston rings and cylinder walls.

A. High Compression.

B. Over Compression.

C. Low Compression

C. Low Compression

Before performing a compression test, what should you do first?

A. you should run the engine first.

B. you spray a small amount of lubricating oil into the cylinder barrels.

C. you measures air leakage in a cylinder.

A. you should run the engine first,

-to ensure that the piston rings, cylinder walls, and other parts are near operating temperature and freshly lubricated.

If performing a compression check after engine build-up or replacing a cylinder, it is not always possible to operate the engine for this test. In a case like this, we should do EXCEPT.

1. spray a small amount of lubricating oil into the cylinder barrels before conducting the test.

2. rotate the engine several times to lubricate the pis­ton ring seals.

3. measures air leakage in a cylinder.

A. only 3

B. 1 and 3

C. 1 and 2.

D. 1,2 and 3.

A. Only 3

Compression can be measured in two different ways: ___________ or _____________.

differential or direct.

Assuming a cylinder without cracks, air can leak in three areas: ____________________,___________________, and __________________.

past the intake valve, past the exhaust valve, and past the piston rings.

A _________________ in the crankcase breather or through the oil filler cap indicates air leaking past the piston rings.

hissing sound

A direct compression test measure what?

A. measure the air and fuel mixture.

B. measures the actual pres­sures within a cylinder.

C. measures the quality of combustion chamber sealing.

B. measures the actual pres­sures within a cylinder.

TRUE OR FALSE:

Turn the ignition off and remove the key. Move the throttle control to the closed position. Move the mixture control to the idle cutoff position. Move the fuel selector to the off position.

TRUE

TRUE OR FALSE:

Remove the most accessible spark plug from each cylinder.

TRUE

TRUE OR FALSE:

Ensure that the area around the propeller is clear of people and objects. Rotate the engine with the starter to fill the cylinders of any accumulated oil and loose carbon particles.

FALSE (to clear)

TRUE OR FALSE:

Install a tester in each cylinder. If only one tester is available, check each cylinder simultaneously.

FALSE (individually)

TRUE OR FALSE:

Move the throttle control to the open position. Connect the aircraft to external power for rotating the engine because a weak aircraft battery will turn the engine slowly, showing lower than nor­mal, or expected, compression readings. Use the starter to rotate the engine at least three complete revolutions, and then record the compression readings.

TRUE

TRUE OR FALSE:

Move the throttle control to the open position. Connect the aircraft to external power for rotating the engine because a weak aircraft battery will turn the engine slowly, showing lower than nor­mal, or expected, compression readings. Use the starter to rotate the engine at least four complete revolutions, and then record the compression readings.

FALSE (three)

TRUE OR FALSE:

Recheck any cylinder that registers a compression value significantly higher than the other cylinders to verify accuracy. A reading approximately 20 p.s.i. lower than the others indicates a cylinder leak that must be repaired. To be sure that the low reading is not the result of faulty test equipment, repeat the compression check with a unit known to be accurate.

FALSE (lower, 15psi)

TRUE OR FALSE:

Recheck any cylinder that registers a compression value significantly lower than the other cylinders to verify accuracy. A reading approximately 15 p.s.i. lower than the others indicates a cylinder leak that must be repaired. To be sure that the low reading is not the result of faulty test equipment, repeat the compression check with a unit known to be accurate.

TRUE

TRUE OR FALSE:

Hydraulic lock is a condition that can develop in a piston engine where oil or liquid fuel accumulates, or pools, in the lower cylinders, or lower intake pipes.

FALSE (Radial Engine).

TRUE OR FALSE:

Because fluids cannot be compressed, attempts to start an engine with hydraulic lock can cause severe damage to the engine.

TRUE

TRUE OR FALSE:

Before attempt­ing to start any radial engine that has not run in the previous 30 minutes, check for hydraulic lock.

TRUE

TRUE OR FALSE:

To do this, make sure the ignition switches am off, then rotate the propeller by hand at least three revolutions in the normal direction.

FALSE ( at least two Revolutions)

TRUE OR FALSE:

Attempt to clear hydraulic lock by rotating the propeller in the opposite direction.

FALSE ( Never attempt)

A direct compression test measures the _____________ within a cylinder.

actual pres­sures

As stated before, for an engine to produce maximum rated power, the______________________________ and seal tightly.

valves must open and close prop­erly

_______________ is a critical fac­tor in making sure that the valves operate properly.

A. Valve clearance

B. Hydraulic Lock

C. Compression testing.

D. Ignition timing

A. Valve clearance

Naturally, this results in a variation in valve overlap between cylinders. When this happens, it becomes impossi­ble to ________________ for all cylinders, which results in individual cylinders producing various amounts of power.

A. set the maximum fuel mixture

B. set the minimum fuel mixture

C. set the idle fuel mixture

C. set the idle fuel mixture

A noticeable effect on mixture distribution between cylinders occurs with a difference in valve clearance as little as _____________.

A. 0.05 inch.

B. 0.005 inch.

C. 0.0005 inch.

B. 0.005 inch.

When an intake valve opens early and closes late, the like result is __________________

A. backfiring at low speeds.

B. reduces valve duration and the valve overlap period.

C. prevents the cylinder from admitting a full charge of fuel and air.

A. backfiring at low speeds.

Valve clearances change directly with _________________;

A. Pressure

B. Density

C. Temperature

C. Temperature

_________________ is a condition that can develop in a radial engine where oil or liquid fuel accumulates, or pools, in the lower cylinders, or lower intake pipes.

A. Valve clearance

B. Hydraulic Lock

C. Compression testing

D. Ignition timing

B. Hydraulic Lock

Before attempt­ing to start any radial engine that has not run in the previous ______________.

A. 20 Minutes

B. 30 Minutes

C. 40 minutes

B. 30 Minutes

Todo this, make sure the ignition switches am off, then rotate the propeller by hand ___________________ in the normal direction.

A. at least two revolutions

B. at least four revolutions

C. at least one revolution