Jeppesen Chapter 2 - Reciprocating Engine Operation, Instruments, Maintenance, and Overhaul (27 items)

Question 1

Q2. A cold cylinder is found when troubleshooting a running engine. What does this indicate?

Answer 1

No combustion in that cylinder.

Question 2

Q3. When pulling a propeller through, a hissing sound is heard, indicating valve blow-by. What procedure should be performed next?

Answer 2

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

Question 3

Q4. What is the purpose of performing a compression test?

Answer 3

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

Question 4

Q5. When an engine is overhauled, how is the total time affected? When an engine is rebuilt, how is its operating history affected?

Answer 4

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

Question 5

Q6. What inspections should be performed after a propeller strike without sudden stoppage?

Answer 5

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 6

Q7. Name some of the precautions that should be performed prior to engine removal.

Answer 6

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

Question 7

Q8. When inspecting a piston, where are the cracks most likely to be found?

Answer 7

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

Question 8

Q9. What does it mean if an engine part is within “serviceable limits”?

Answer 8

It means that the part is within the manufacturer’s limits and can be used in an engine (does not require replacement).

Question 9

Q10. What tools or instruments are used to inspect a cylinder barrel for out-of-roundness?

Answer 9

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. Two readings should be taken 90 degrees to each-other.

Question 10

Q11. How can a loose stud in an engine crankcase be repaired?

Answer 10

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

Question 11

Q12. What publication is used to check an engine for normal operation?

Answer 11

12. Manufacturer’s maintenance manual.

Question 12

Q13. A weak cylinder is found during a compression check. What must be inspected?

Answer 12

13. Pressure is transmitted equally in all directions.

Question 13

Q14. What purpose does an oil analysis serve?

Answer 13

A14. Metal particles in the oil show normal and abnormal wear of the engine. This helps in evaluating the engine’s internal condition.

Question 14

Q15. What inspection should be performed on an engine that has been in storage?

Answer 14

A15. Perform an inspection to determine if there is any corrosion damage.

Question 15

Q16. Where should a carburetor air temperature bulb be located?

Answer 15

A16. In the ram air intake duct?

Question 16

Q17. What is the fuel pressure range on a float-type carburetors?

Answer 16

A17. 3 to 5 psi

Question 17

Q18. Name the basic component of a fuel system.

Answer 17

A17. The transmitter and the indicator.

Question 18

Q19. What unit of measure is generally used to indicate fuel flow?

Answer 18

A19. Pounds or Gallons per hour.

Question 19

Q20. Why is fuel flow monitored?

Answer 19

A20. To determine fuel consumption and engine performance.

Question 20

Q21. What does the manifold gauge indicate and how is it calibrated?

Answer 20

A21. It measures the the absolute pressure in the engine manifold and is calibrated in inches of mercury.

Question 21

Q22. What directly controls manifold pressure?

Answer 21

A22. Throttle opening and engine r.p.m.

Question 22

Q23. During engine operation, where should the propeller control be set when checking the manifold pressure?

Answer 22

Q23. Low pitch, high r.p.m.

Question 23

Q24. Is the aircraft electrical system required to power a cylinder head temperature gauge?

Answer 23

A24. No. A thermocouple is used as the electrical source.

Question 24

Q25. What are the possible indications of an oil pressure transmitter or indicator malfunction?

Answer 24

A25. A severe or sudden drop in oil pressure while the oil temperature remains normal and the oil supply remains full.

Question 25

Q26. What does a tachometer indicate on a reciprocating engine?

Answer 25

A26. Engine r.p.m.

Question 26

Q27. Where should the thermocouple be installed on a reciprocating engine using a single probe cylinder head temperature system?

Answer 26

A27. On the hottest cylinder

Question 27

Q1. What indications are given in the event of a leaking or open primer while the engine is running?

Answer 27

A1. The engine will not idle properly.