Description

Cummins QSX15 Parts Catalog – Factory Specs for Industrial Engines

If you’ve ever hung a part on a QSX15 and found it didn’t fit because the supplier swapped a superseded number without telling you, you know the cost of guesswork. This factory-issued Cummins QSX15 Parts Catalog ends that. 179 pages of OEM illustrations and part breakdowns, exactly as Cummins printed them – no aftermarket rearranging, no re-labeled diagrams. Every component from the Crankshaft (pages 9, 19) to the Camshaft (104, 110) is listed with factory part numbers and required quantities.

Cylinder Block and Crankshaft – Where the Real Work Happens

Starting with the Cylinder Block (pages 5, 15) and Cylinder Liner Kit (6, 16), this catalog gives you exploded views that show exactly which sleeves, pistons, and rings go where. The Crankshaft section (9, 19) includes all bearing shells, thrust washers, and the flywheel key – no guessing which supplier part crosses over. You get the Cummins part number. Period.

Camshaft and Valve Train: Page 104 Coverage

Camshaft section spans pages 104 and 110. It covers the cam itself, followers, and the gear train interface. If you’re replacing a camshaft, you need the correct bolts and thrust plate – this catalog lists them. Also included: the Rocker Lever (page 127) and Valve Cover (141). Don’t trust an aftermarket website that re-numbers these parts.

Engine Brake System – Don’t Guess the Parts

Engine Brake (page 40) is a separate assembly with its own housing, solenoids, and hardware. This catalog breaks it down. Get the right slave piston and seal kit the first time.

Stop ordering wrong parts. One digit change on a part number can mean a different bore diameter. That’s wasted shipping and downtime.

179 Pages of Factory-Correct Part Numbers

This isn’t a reprint of a reprint. It’s the original Cummins PDF, 179 pages, indexed by both Option Number (page A-1) and Part Number (page B-1). The Kits & Sets section on page 155 groups commonly needed overhaul components – ideal when you’re doing a major Cylinder repair. Fuel system parts? Fuel Pump (61, 67) and Injector (107, 113) are detailed. For the charging system, see Alternator (42) and Starting Motor (132). Every section mirrors the factory layout.

For a broader understanding of how the QSX15 fits into diesel engine technology, read this Wikipedia article on diesel engines. Also refer to this Wikipedia article on diesel engines for cycle fundamentals.

Find Parts Fast with the Part Number Index

The Part Number Index (page B-1) is your cheat sheet. If you have a number from an old Cummins part, look it up there and it tells you which page and reference number to find it on the exploded diagram. Same for the Option Number Index (page A-1) – when you need agency-specific parts for EPA Tier 1 or Tier 2 engines (see pages 2-3 for Agency Approval), that index saves you cross-referencing.

Who Needs This Catalog?

If you maintain a fleet of industrial QSX15s in San Antonio or anywhere in North America, this is your parts bible. Beginners who are tearing down their first heavy-duty diesel will avoid the nightmare of ordering the wrong piston cooling nozzle (pages 98, 120), the wrong engine brake slave piston, or a water pump that doesn’t match the housing bolt pattern. Professionals will appreciate having the exact part number for a Brake assembly or Water Pump (149, 151) without calling the dealer and waiting on hold. It pays for itself on one misordered turbocharger (115, 124) – a single return shipping fee can cost more than this manual. The index system means you can find the oil pan (95) or the front gear cover (75, 77) in seconds. If you work on these engines daily, you’ll keep this catalog open on a tablet next to the engine stand. It’s as essential as the torque wrench.

OEM vs Aftermarket – Why It Matters

Aftermarket parts catalogs often combine multiple engine families into one generic PDF, merging illustrations and dropping footnotes. This catalog is direct from Cummins. Every bolt, gasket, and sensor has a single authoritative part number. If you rely on third-party documentation, you risk getting a part that is “close enough” – and close enough fails under load. Stick with the factory source.

Related Manuals for Your QSX15

• Cummins Quantum Series Installation Recommendations Manual
• Cummins Signature ISX QSX15 Service Manual
• Cummins VME W380 Parts Catalog | 626-Page Factory Manual

Frequently Asked Questions

Is this manual suitable for a complete engine rebuild?

No. This is a parts catalog, not a service manual.

How do I find the correct part number if I only have the engine serial number?

Start with the Part Number Index on page B-1. Every component listed in the catalog cross-references to its exploded diagram. For example, the Camshaft section (pages 104, 110) groups related parts like cam followers, thrust washers, and bolts. If your old part has no visible number, match the assembly drawing to your engine configuration. The Option Number Index (page A-1) also helps when the engine has agency-specific certifications like EPA Tier 2. Never assume a visual match – one digit difference on a Crankshaft (pages 9, 19) means the wrong journal diameter. Factory documentation eliminates that risk.

Access the Factory Manual now and keep it on your tablet or printed in the toolbox – you’ll reference it every time you touch a QSX15.