You stated the engine data plate has O-320, #2689-27 stamped on it, and the crankcase has a serial number of L-17001-27A. Since you didn’t mention whether there was a suffix following the 320, I’ll assume there was not, which tells me this is a very old engine. I can tell you that both of these numbers are potentially for the O-320 series, but we’ve got to go a little further to determine what you’ve really got here. I say interesting because of the two serial numbers you provided. I tried using the Lycoming website, hoping for a serial number lookup table, but so far no luck.ĪNSWER: Thanks for your interesting question. The case is cast with the number L-17001-27A. I have only the following data, and am wondering how or where I can use these data to determine exactly which engine this is. QUESTION: A friend has an O-320 in his hangar.
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