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AC 43.13-1B 9/8/98 TABLE 8-1. Current engine and maximum permissible cylinder barrel oversize. might possibly promote corrosive action. (Re- fer to Chapter6, Corrosion, Inspection, and Protection.) 8-13. ENGINE RUN-IN. After an aircraft engine has been overhauled, it is recom- mended that the pertinent aircraft engine manufacturer’s run-in instructions be followed. Observe the manufacturer’s recommendations concerning engine temperatures and other cri- teria. Repair processes employed during over- haul often necessitate amending the manufac- turer’s run-in procedures. Follow the ap- proved amended run-in procedures in such in- stances. NOTE: Do not run up engines on the ground for long periods of time with the cowling off. The engine will over- heat because cylinder cooling has been disrupted. 8-14. COMPRESSION TESTING OF AIRCRAFT ENGINE CYLINDERS. A test to determine the internal condition of the com- bustion chamber cylinder assembly by ascer- taining if any appreciable internal leakage is occurring is compression testing of aircraft en- gine cylinders. If a cylinder has less than a 60/80 reading on the differential test gauges on a hot engine, and procedures in para- graphs 8-15b(5)(i) and (j) fail to raise the com- pression reading, the cylinder must be removed and inspected. To determine the cylinder’s problem area, have someone hold the propeller at the weak cylinder’s top dead center and with compressed air still being applied, listen. If air is heard coming out of the exhaust pipe, the cylinder’s exhaust-valve is not seating prop- erly. If air is heard leaking out of the air cleaner/carburetor heat box, the intake valve is leaking. With the oil dipstick removed, and air is rushing out, the piston rings are defective. Remove and repair/overhaul the defective cylinder. Engine manufacturer Air Cooled Motors (Franklin) Continental Motors Jacobs Kinner Pigman, LeBlond, Rearwin, Ken Royce Lycoming Menasco Pratt & Whitney Ranger Warner Wright Engine series No oversize for sleeved cylinders. Solid cylinders........... R-670, W-670, R9A.... GTSIO-520, 550........ All others.................... All.............................. All.............................. All.............................. All.............................. All.............................. R-2800B, C, CA, CB.. *R-959 and R-1830.... All others.................... 6-410 early cyls. 6-390 6-410 late cyls. 6-440 (L-440) series.. All.............................. All.............................. Max. oversize (in.) 0.017 0.010 to 0.020 0.005 0.015 0.015 0.015 0.025 0.010 to 0.020 0.010 0.025 0.030 0.020 0.010 0.120 0.015 0.020 *(The above oversize limits correspond to the manufacturer’s requirements, except for P&W R-985 and R-1830 series engines.) NOTE: ( Check for latest manufacturer specifications.) (4) Cylinder barrels which have been plated by an agency whose process is approved by the FAA and which have not been worked beyond maximum permissible limits, will be considered acceptable for installation on certi- ficated engines. It will be the responsibility of the owner or the repairing agency to provide this proof. In some cases, it may be necessary to remove cylinders to determine the amount of oversize since this information may be etched on the mating surface of the cylinder base flange. 8-12. CORROSION. Accomplish corrosion preventive measures for temporary and long- term storage in accordance with the instruc- tions issued by the pertinent engine manufac- turer. Avoid the use of solutions which con- tain strong caustic compounds and all solu- tions, polishes, cleaners, abrasives, etc., which Page 8-6 Par 8-11PDF Image | AFS-640
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