2 Recip Engine Op, Instruments, Maint, And Overhaul

Question 1

1. What indications are given in the event of a leaking or open primer while the engine is running?

Answer 1

The engine will not idle properly.

Question 2

2. A cold cylinder is found when troubleshooting a running engine. What does this indicate?

Answer 2

No combustion in that cylinder.

Question 3

3. When pulling a prop through, a hissing sound is heard, indicating valve blow-by. What procedure should be performed next?

Answer 3

A compression check should be performed to identify the faulty cylinder.

Question 4

4. What is the purpose of performing a compression test?

Answer 4

To determine if the valves, pistons, and rings are sealing properly.

Question 5

5. When an engine is overhauled, how is its total time affected? When an engine is rebuilt, how is its operating history affected?

Answer 5

The total time on the engine must be continued and the time since major overhaul is entered into the engine log. If the manufacturer rebuilds the engine, it is granted a zero time status and is considered to have no previous operating history.

Question 6

6. What inspections should be performed after a prop strike without sudden stoppage?

Answer 6

1. Inspect engine mounts, the crankcase, and the nose section for damage.
2. Inspect the oil and oil filters/screens for metal particles.
3. Inspect the crankshaft or driveshaft for cracks and misalignment.

Question 7

7. Name some of the precautions that should be performed prior to engine removal.

Answer 7

Disconnect the battery, turn off the fuel valves, chock the wheels, and if necessary, install a tail stand.

Question 8

8. When inspecting a piston, where are cracks most likely to be found?

Answer 8

In those areas that are high stressed; usually the base of the piston bosses, inside at the junction of the bore and the walls, and the ring lands.

Question 9

9. What does it mean if an engine part is within serviceable limits?

Answer 9

It means that the part is within the manufacturer’s limits and can be used in an engine.

Question 10

10. What tools or instruments are used to inspect a cylinder barrel for out of roundness?

Answer 10

A dial indicator or an inside micrometer is usually used to measure the top of the cylinder and at the skirt. A telescopic gauge and micrometer can also be used. 2 readings should be taken 90 degrees to each other.

Question 11

11. How can a loose stud in an engine crankcase be repaired?

Answer 11

Remove the loose stud and inspect the hole for size and thread condition. It may be necessary to use an oversize stud or Heli Coil insert.

Question 12

12. What publication is used to check an engine for normal operation?

Answer 12

Manufacturer’s maintenance manual.

Question 13

13. A weak cylinder is found during a compression check. What must be inspected?

Answer 13

Pressure is transmitted equally in all directions.

Question 14

14. What purpose does an oil analysis serve?

Answer 14

Metal particles in the oil show normal and abnormal wear of the engine. This helps in evaluating the engine’s internal condition.

Question 15

15. What inspection should be performed on an engine that has been in storage?

Answer 15

Perform an inspection to determine if there is any corrosion damage.

Question 16

16. Where would a carburetor air temp bulb be located?

Answer 16

In the ram air intake duct.

Question 17

17. What is the fuel pressure range on float type carburetors?

Answer 17

3-5 psi

Question 18

18. Name the basic components of a fuel indicator system.

Answer 18

The transmitter and the indicator.

Question 19

19. What unit of measure is generally used to indicate fuel flow?

Answer 19

Pounds or gallons per hour.

Question 20

20. Why is fuel flow monitored?

Answer 20

To determine fuel consumption and engine performance.

Question 21

21. What does the manifold gauge indicate and how is it calibrated?

Answer 21

It measures the absolute pressure in the engine manifold and is calibrated in inches of mercury.

Question 22

22. What directly controls manifold pressure?

Answer 22

Throttle opening and engine RPM.

Question 23

23. During engine operation, where should the propeller control be set when checking the manifold pressure?

Answer 23

Low pitch, high RPM.

Question 24

24. Is the aircraft electrical system required to power a cylinder head temp gauge?

Answer 24

No. A thermocouple is used as the electrical source.

Question 25

25. What are the possible indications of an oil pressure transmitter or indicator malfunction?

Answer 25

A severe or sudden drop in oil pressure while the oil temp remains normal and the oil supply remains full.

Question 26

26. What does a tach indicate on a reciprocating engine?

Answer 26

Engine RPM.

Question 27

27. Where should the thermocouple be installed on a reciprocating engine using a single probe cylinder head temp system?

Answer 27

On the hottest cylinder.