Hydraulic Pump Adapter Assembly with Gear, Lycoming 540 Series 71675, 71676.
This adapter was purchased as "used" for a project involving the installation of a B&C backup alternator (standard vac pump drive) to an IO540-C4D5D engine. Unfortunately the -C5D5D is not compatible with this adapter. Lycoming were completely useless... the adapter will fit most of the -C engines but but the -C4D5D.
It has been paint stripped, pressure cleaned, dye penetration NDTd, repainted with Lyco paint, has a new oil seal, and there is no apparent wear on it. A new gasket is included. The oil feed hole to the hydraulic pump end has been plugged with a grub screw, which is the correct thing to do if driving an accessory that doesnt need oil (an alternator or a vacuum pump). No paperwork is included so you may need an A&P to certify this part.
Please note the P/N is either 71675 or 71676. It isn't obvious which one it actually is. You need to refer to the photos and to the PDF manuals above. I suspect one of those two part numbers doesn't actually exist, but Lycoming were unable to communicate usefully on the subject. The casting has "75176" cast on it.
USD / GBP / Euro 150 plus shipping