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A. recip engine
recip engine 1
| Question | Answer |
|---|---|
| what is the purpose of the dynamic dampers on crankshafts? | the reduce engine vibration. |
| what types of bearings are generally found in reciprocating engines? | plain, roller, and ball bearings. |
| are the connecting rods used in each cylinder of a radial engine the same? explain. | no. radial engines use master and articulating rod assemblies. |
| name the different types of piston rings. | oil control, compression, and oil scraper. |
| where should piston ring gaps be installed relative to each other, and why? | compression ring gaps should be staggered so that they do not align. this prevents excessive blow-by. |
| what could result from incorrectly installed piston rings? | excessive oil consumption. |
| what purpose do oil control rings serve? | they regulate the thickness of the oil film on the cylinder walls. |
| what is used to help prevent valve surge or floating in an aircraft engine? | two or more springs are used on each valve. |
| on engines equipped with hydraulic valve spring lifters, what should the running valve clearance be? | zero. |
| what is the purpose of valve overlap? | to provide better volumetric efficiency and lowers cylinder operating temperatures. |
| 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 should be performed to identify the faulty cylinder. |
| what is the purpose of performing a compression test? | 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? | 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. |
| what inspections should be performed after a propeller strike without a sudden stoppage? | 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. |
| 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 if necessary, install a tail stand. |
| when inspecting a piston, where are cracks most likely to be found? | in those areas that are highly stressed; usually the base of the piston bosses, inside 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 manufacturer's 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? | 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 |
| 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 may be necessary to use an oversized stud or heli-coil. |
Created by:
Justin84
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