Description

Cummins V-903, VT-903 Parts Catalog

Let me tell you straight: if you are working on a Cummins V-903 or VT-903 and you are using a third-party parts list, you are asking for trouble. This Parts Catalog is the real deal — factory-issued, 49 pages thick, with the same exploded views and part numbers the Cummins dealers use. I have seen too many guys bolt on a wrong part because they trusted some online cross-reference. Do not be that guy. This PDF gives you the OEM numbers for everything from the Camshaft to the Crankshaft, and every Cylinder component in between.

Cylinder Block and Cylinder Head: Factory Part Numbers

When you pull a cylinder head on a V-903, you need to know exactly which gasket set and head bolts match your serial number range. This catalog breaks down the Cylinder block and Cylinder head sections with individual callouts. The Cylinder liner group is also listed separately — crucial if you are re-sleeving. Do not rely on a generic kit. Use the OEM part numbers from this book to order from your Cummins dealer.

Fuel System Breakdown: From Pump to Injector

The Fuel section covers the Fuel filter, Fuel gear pump, Fuel pump drive, Fuel pump damper, and the Fuel pump itself, plus all Fuel tubing. Each component has its own exploded diagram. The Injector listing includes the part number for the complete assembly and individual nozzles. If you are rebuilding a VT-903, having the right fuel pump drive part number saves you a week of waiting for the wrong one.

Camshaft and Crankshaft: Critical Identification

Two sections you will use repeatedly: Camshaft and cover and Camshaft bushings, plus Crankshaft and main bearings. The catalog lists the camshaft part number by engine model — the V-903 and VT-903 share some components but not all. The crankshaft listing includes the rear bearing support and main bearing sets. Ordering a crankshaft without the correct part number from this catalog is a gamble you do not need to take.

Electrical Equipment: What This Catalog Includes

The Electrical equipment chapter covers the Alternator, Starting motor, and related wiring harness callouts. While this is not a wiring diagram, it gives you the OEM part numbers for the starter and alternator specific to your application. The Shutdown valve and Throttle lever assemblies are also in this section for the VT-903 models.

Parts Ordering Instructions: Use Page 4 for Accuracy

Page 4 of this manual contains the official Cummins parts ordering guide. It tells you to list the correct part number, state the model and serial number if you are unsure, and arrange your purchase order in numerical sequence. Follow that page exactly when you call your dealer. It also reminds you that part numbers in parentheses are for identification only — do not order those. I have seen shops waste money because they ignored that note.

This catalog covers the VT-300, Formula VT-300, VT-350, VTA-500, and multiple V-903 and VT-903 variants (page 5). If you work on any of those engines, this PDF is your reference for genuine part numbers. It is not a service manual — it will not tell you torque specs or repair procedures. But for ordering the right parts, it is the only source you should trust.

Related manuals you might need: Cummins VME W380 Parts Catalog | 626-Page Factory Manual, Cummins QSX15-G8 2011 Parts Catalog – OEM Factory Manual, and Cummins V-378 Parts Catalog – OEM Factory 37-Page Manual.

For background on how these engines work, see this Wikipedia article on diesel engines.

Frequently Asked Questions

Does this parts catalog include torque specifications?

No. This is a parts catalog, not a service or repair manual. You need a separate Cummins workshop manual for torque values and repair procedures.

How do I order parts using this catalog?

Follow the instructions on page 4. Write your order clearly, use the correct part number from the catalog, and list the engine model and serial number if you are unsure. Part numbers are usually stamped on the part itself. Always specify shipping instructions. If you order by the numbers in this catalog, you will get genuine Cummins parts that fit correctly the first time. Do not use part numbers listed in parentheses — those are identification-only numbers and may not be orderable.

For anyone working on a V-903 or VT-903, having the factory part numbers saves you time and money. Access the Factory Manual now and keep it on your workbench — or on your tablet — whenever you need to order genuine Cummins components.