Description

Cummins ISX, QSX Parts Catalog – 508 Pages of Factory Parts Data

If you have rebuilt one of these inline-sixes, you already know that using the wrong piston or an off-spec liner will cost you a teardown inside 50,000 miles. A parts catalog from an aftermarket reprint house might show a drawing that looks right, but the part number? Interchangeable from memory. That gets you a phone call from a customer whose $12,000 overhaul is knocking before the oil change. This Cummins ISX, QSX Parts Catalog runs 508 pages from the factory source — every gasket, piston, ring, and bearing is listed with the OEM number that Cummins stamped on the box.

Parts Coverage: Beyond the Basics

You need more than a parts number lookup. On page 2 of the catalog you will find AFA’s articulated piston breakdown — forged steel crown, aluminum skirt, bonded manganese phosphate coating. That is not a Barrington performance upgrade; that is the factory spec for severe-duty applications. The manual includes induction-hardened liners, tri-metal rod and main bearings, and the steel-core multi-layer graphite head gasket that keeps coolant where it belongs. Each component gets an exploded view with callouts that match the bin label at your local dealer.

AFA Piston Technology: Forged Steel vs. Aluminum

Inside this catalog you will find two distinct piston families. The two-piece articulated piston uses a forged steel head for high-temperature and high-load conditions, paired with a cast aluminum skirt that sheds weight. The one-piece solid aluminum piston gets an Ni-resist ring land and an application-engineered combustion bowl. Both families include ring land machining specs, pin bore tolerances, and coating requirements. If you are building a fleet engine that runs 24/7, you want the articulated. If you are doing a rebuild for a pick-up-truck owner who never sees a loaded trailer, the solid aluminum is the cost-effective call. The catalog gives you both options with full part numbers.

Induction-Hardened Liners and Tri-Metal Bearings

The liner section runs from the upper flange down to the lower seal carrier. Induction-hardened liners get the nod for strength and wear resistance — no chrome plating guesswork. Rod and main bearings are tri-metal advanced alloy, which means a steel backing, a copper-lead intermediate layer, and a lead-tin overlay. That three-layer construction handles the oil-film breakdown that kills a standard bimetal bearing. The catalog lists each bearing set by journal diameter and clearance class. If you are setting up a crank that has been ground 0.010 under, you get the correct shell.

The Q³ Technology Standard

AFA labels their top-tier line Q³ — Quality Materials, Quality Engineering, Quality Manufacturing. Some corporate competitors have cut corners on heavy-duty parts. AFA states plainly in this catalog that they do not compromise on that standard. You will find CAD/CAM engineering references, metallurgical bonding specs for ring lands, and graphite coatings where required. The catalog is not a brochure; it is a specification document. You can order parts from it and know that what you receive matches the design intent of the ISX and QSX engines.

Why an OEM Parts Catalog Beats Aftermarket Documentation

Aftermarket catalogs often merge part numbers across multiple OEM supersessions, or worse, they list a generic number that cross-references to three different manufacturers. Every time I have run an aftermarket listing on a Cummins ISX, the callout for the injector hold-down bolt was wrong — thread pitch slightly off, or the length was 5 mm short. A stripped thread in a cast-iron head is not cheap to repair. This catalog comes from the OEM documentation chain. The 508 pages were scanned from the original binder that Cummins issued. No reprint house touched the content. You can verify part numbers against the physical component in your hand.

Related manuals that belong on the same shelf: Cummins ISX Interact System Technical Manual covers the electronic controls; Cummins Signature ISX QSX15 Service Manual gives you the overhaul procedures; and Cummins VME W380 Parts Catalog | 626-Page Factory Manual is the right supplement for mining equipment.

If you want a deeper understanding of how diesel injection and combustion affect part wear, read this Wikipedia article on diesel engines or this Wikipedia article on diesel engines.

Who Should Use This Catalog

Home garage enthusiasts who rebuild their own fleet trucks need this catalog for ordering without calling a dealer. Shop owners need it to stock the right fasteners and gaskets so a job does not stall waiting for parts. Beginners who are assembling an engine from a short block should use this to get the correct piston ring set for their application — the catalog lists ring widths and bore sizes in imperial units. Do not guess, do not use aftermarket cross-reference charts. Use the factory part number.

FAQ

Does this catalog include torque specifications for assembly?

No. This is a parts catalog, not a service manual. It lists part numbers, dimensions, and materials. For torque values and clearance specs, you need the Cummins ISX service manual. This catalog gets you the right liners and bearings; the service manual tells you how to install them.

Are the part numbers in this catalog current for 2025 Cummins production?

The catalog covers original OEM design part numbers. Some numbers may have been superseded by Cummins after publication. Always check the latest Cummins parts bulletin for active supersessions, but the base numbers in this manual match the factory drawings.

Stop burning billable hours chasing part numbers from a third-party website. Get the factory documentation on your screen or printed out. Access the Factory Manual now and start ordering with full confidence in the part number.