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Recip-Overhaul
Overhaul Practices for Recip Engines
| Question | Answer |
|---|---|
| What changes in an engine will eventually make overhaul necessary? | Wear and stress, changing dimensions, foreign materials (sludge, gums, corrosive/abrasive things), crystallized metal caused by recurring stress, actual failure of a part |
| How is ''overhauled engine'' defined? | An engine that has been disassembled, cleaned, inspected, repaired as necessary, reassembled, and tested according to the manufacturer's specs |
| What is the purpose of a receiving inspection? | To determine the general condition of the engine when received, provide inventory of of the engine and accessories, organize the records, and prepare for overhaul. |
| Discuss the importance of reviewing manufacturer's bulletins and ADs during overhaul. | To ensure the engine is complying to new standards; otherwise, it will be deemed "unairworthy" until it complies |
| Methods and purpose of preliminary visual inspection? | Done by direct examination and a magnifying glass with a light; reveals cracks, corrosion, nicks, scratches, galling, or other imperfections. |
| Degreasing vs decarbonizing | Degreasing rids of oil Decarbonizing rids of hardened carbon |
| Describe vapor degreasing. | The part is suspended inside a closed booth above a degreasing solution, such as trichloroetylene. This is heated until it vaporizes and the vapor dissolves the oil and it runs off. |
| List the most common methods of decarbonizing. | Stripping, blasting with gritty material, vapor blasting, and scraping |
| Describe vapor blasting. | Hot vapor solution used with a fine abrasive is sprayed onto the part inside a closed booth. Used on parts/sections of parts where it won't be affected by a small amount of material corrosion. |
| What can sandblasting be used for during engine overhaul? | Prep for metallizing of cylinders |
| Why should parts be covered in a preservative oil after cleaning? | To prevent premature failure of the part. |
| How are components structurally inspected? | NDT; mag-particle, liquid penetrant, eddy-current, ultrasonic, radiography |
| Briefly describe mag-particle inspection. | An NDT method used to locate surface and subsurface discontinuities in ferromagnetic materials; flux leakage finds the issue with the part |
| Describe liquid penetrant inspection. | Penetrant is applied to the part and soaks into the surface. Developer is applied and as it reacts to the penetrant, it makes any surface discontinuity visible in light. |
| What is a dimensional inspection used for? | To determine the degree of wear for parts of the engine where two moving parts are in constant contact |
| What instrument is used to measure the cylinder bore? | Cylinder bore gauge |
| Describe the use of a thickness gauge. | Used to measure side/end clearances, valve clearances, and other small dimensions; a tab is inserted until it is a comfortable fit |
| How many copies of receiving inspection report? Where do they go? | 2; original to company, copy to owner |
Created by:
bpyles1
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