This is an ORIGINAL Cummins ISC, QSC8.3, & ISL Diesel Engines Troubleshooting and Repair Manual Set (May 1999 printing). This manual set has super illustrations as well as having in-depth troubleshooting, repair, fault codes, & specification information for these long lasting Cummins diesel engine ECS systems. The condition of their covers is very good with an edge nick on Volume II. The splines are tight and intact with NO loose or missing pages. This manual set contains 800+ pages that are in very good shape with minor edge toning from being in the shop. Manual set is in VERY GOOD overall condition. FREE S & H!