Recip Engine Operation, Instuments, Maintenance + Overhaul 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 while troubleshooting a running engine. What does this indicate?
No combustion in that cylinder
When pulling a propeller through, a hissing sound is hurt, indicating valve blow by. What procedure should be performed next?
A compression check should be performed to identify the faulty cylinder
What is the purpose of performing a compression check?
To determine if the valves, pistons 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?
When overhauled, the total time of the engine must be continued and the time since major overhaul is entered in the engine log.
If the manufacturer rebuilds the engine, it is granted a zero time status, and it’s considered to have no previous operating history.
What inspections should be performed after a propeller strike without sudden stoppage?
1) engine mounts, crankcase, and the nose section for damage.
2) oil filters for metal particles.
3) 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 fuel valves.
Chock the wheels.
Install a tail stand.
When inspecting a piston, where are cracks most likely to be found?
1) highly stressed areas.
2) the base of the piston bosses.
3) inside at the junction of the boar in the walls.
4) the ring lands.
What does it mean if an engine part is within serviceable limits?
The part is within the manufacturers limits and can be used in an engine. Does not require replacement.
What tools or instruments are used to inspect a cylinder barrel for out of roundness?
Dial indicator.
An inside micrometer.
Or a telescopic gauge and micrometer.
Two readings should be taken 90° to each other.
How can a loose stud in an engine crank case be repaired?
Remove the loose stud and inspect hole size and thread condition. It may be necessary to use an oversize stud or Heli-coil insert.
A weak cylinder is found during a compression check. What must be inspected?
Pressure is transmitted equally in all directions.
What purpose does an oil analysis serve?
Metal particles in the oil show normal and abnormal wear of the engine. This helps in evaluating the engines internal condition.
What publication is used to check an engine for a normal operation?
Manufacturer’s maintenance manual
What inspection should be performed for an engine that has been in storage?
An inspection to determine if there’s any corrosion damage.
