He was mustered into service on 1 October 1861 (1). He served as a private in company D (1).
He was not on the muster-out roll (1). The Pennsylvania State Archives card refers to a company H card, which I was not able to find (2). Perhaps he is the same person as John T West (H).
1 Bates, Samuel Penniman. History of Pennsylvania volunteers, 1861-5. Harrisburg: B. Singerly, state printer, 1869-71. 5 volumes. 'Ninety-first regiment', volume 3, pages 186-233. (In the roster) (John J West)
2 Civil War Veterans' Card File, available at the Pennsylvania State Archives, searched 30 July 2004 (John J West)