2. Reciprocating Engine Operation, Instruments, Maintenance, and Overhaul (Jeppesen) Flashcards
What indications are given in the event of a leaking or open primer while the engine is running?
The engine will not idle properly.
A cold cylinder is found when troubleshooting a running engine. What does this indicate?
No combustion in that cylinder.
When pulling a propeller through, a hissing sound is heard, indicating valve blow-by. What procedure should be performed next?
A compression check to identify the faulty cylinder.
What is the purpose of performing a compression test?
To determine if the pistons, valves, and rings are sealing properly.
When an engine is overhauled, how is its total time affected? When an engine is rebuilt, how is its operating history affected?
The total time on the engine is continued and time since major overhaul is entered into the engine log. If the manufacturer rebuilds the engine, it’s granted zero-time status and is considered to have no previous operating history.
What inspections should be performed after a propeller strike without sudden stoppage?
- Inspect the engine mounts, the crankcase and the nose section for damage. 2. Inspect the oil and oil filters for metal particles. 3. Inspect the crankshaft or driveshaft for cracks and misalignment.
Name some of the precautions that should be performed prior to engine removal.
Disconnect the battery, turn off the fuel valves, chock the wheels, and install a tail stand if necessary.
When inspecting a piston, where are cracks most likely to be found?
In areas of high stress; at the base of the piston bosses, inside at the junction of the bore and the walls, and the ring lands.
What does it mean if an engine part is within “serviceable limits”?
It means that the part is within the manufacture’s limits and can be used in an engine.
What tools or instruments are used to inspect a cylinder barrel for out-of-roundness?
A dial indicator or an inside micrometer is usually used to measure the top of the cylinder and at the skirt. A telescoping gauge and micrometer can also be used. Two readings should be taken at 90 degrees to each other.
How can a loose stud in an engine crankcase be repaired?
Remove the loose stud and inspect the hole for size and thread condition. It might be necessary to use an oversize stud or Heli-Coil insert.
What publication is used to check an engine for normal operation?
Manufactures maintenance manual.
A weak cylinder is found during a compression check. What must be inspected?
That pressure is being transmitted equally in all directions.
What purpose does an oil analysis serve?
That metal particles in the oil show normal or abnormal engine wear.
What inspections should be performed on an engine that has been in storage?
Corrosion damage inspection.
