Recommends Certain Parts Be Removed And Replaced At Next Inspection Cycle

Continental Motors has updated its guidance for camshaft gears, recommending inspection and removal from service P/Ns 631845, 655430, 655516, or 656031, replacing the gear with with camshaft gear, P/N 656818. The Service Document initially announced the release of improved camshaft gear P/N 656818 in 2005. It now clarifies part number superseding action and amplifies camshaft gear replacement instructions.

The guidance affects Continental Motors (CMI) aviation gasoline (AvGas) engines - IO-470-U, V, VO; IO-520-A, B, BA, BB, C, CB, D, E, F, J, K, L, M, MB, N, NB, P, R; L/TSIO-520- ALL; LIO-520-P; IO-550-A, B, C, D, E, F, G, L, N, P, R; IOF-550-B, C, D, E, F, L, N, P, R; TSIO-550-A, B, C, E; TSIOL-550-A, B, C.

Continental recommends that the inspection be conducted at the next 100-hour or Annual inspection (whichever is applicable based on type of operation or inspection requirements) or next maintenance event when the camshaft gear is made available (whichever comes first). Continue with recurring inspections every 100-hour/Annual inspection until superseded gears are replaced with camshaft gear, P/N 656818 no later than next overhaul.

The actions are recommended to eliminate the possibility of camshaft gear tooth fracture, resulting in power loss or in-flight
shutdown, and to inspect and remove from service P/Ns 631845, 655430, 655516, or 656031 and replace with camshaft gear, P/N 656818.

(Image from Continental Guidance document)

FMI: www.bonanza.org/globalassets/pdfs/service-bulletins/engines/csb05-8c.pdf