Lycoming Part Numbers


Staff member
Mar 27, 2018
New Jersey, USA
Lycomings were made for masochists! If you've ever sent your complete and serviceable engine to a shop for overhaul, only to get it back a few months later, ready to be installed, consider yourself fortunate!

If on the other hand, you bought a pile of parts without knowing if those parts were actually for the airplane you thought you were buying, and if you had hoped to gather parts from that pile in order to have enough of them to eventually arrive at an overhauled engine, then you understand my pain! lol

And that's where the Lycoming Parts Catalog comes into play. But don't take my word for it, here's a great article by Paul Dye of Kitplanes magazine to explain it.
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There's a link in the article to Lycoming's master list of superceded part numbers.

Here's the parts manual for the AEIO-360-H1A, the rear-governor version of the 180hp Super Decathlon engine. Have a look and count your blessings if you've never had to look through it before!!!
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Well-known member
Aug 21, 2020
Pacific NW
Oh what fun! I have a O-360 that requires a used or new crank. I'd like to have the oil passage for a Constant Speed Prop. At this point not sure if I'm going to go CS. However you can cap it if you decide to go fixed pitch prop, you just can't go the other way around.
It would seem there's about 7 different part numbers for effectively the same crankshaft.

Bob Turner

Well-known member
Apr 4, 2018
If you buy used, there is an AD on the ones with lightening holes in the prop flange.