Clark W. Griswold
Join Date: Mar 2014
Location: ,location, location
Posts: 13,793
Bikes: Foundry Chilkoot Ti W/Ultegra Di2, Salsa Timberjack Ti, Cinelli Mash Work RandoCross Fun Time Machine, 1x9 XT Parts Hybrid, Co-Motion Cascadia, Specialized Langster, Phil Wood Apple VeloXS Frame (w/DA 7400), R+M Supercharger2 Rohloff, Habanero Ti 26
Mentioned: 55 Post(s)
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You might consider telling us what derailleur you have first? You can also just search for the derailleur online and Shimano usually has their tech guides up even from stuff from the 80s and maybe also so 70s stuff till today. SI.Shimano.com
It sounds like that bike needs quite a bit of work or potentially needs a professional mechanic to look at it if it was you who did it.