The Caterpillar 3304 is a 4-cylinder, 4-stroke industrial diesel from Cat's 3300 series. It is a water-cooled, 24V, direct-injection engine known for a simple, sturdy design that is straightforward to service, and it has powered older Cat machines, generator sets, and pumps for decades. It is a commercial-grade power unit, not a passenger-vehicle engine, and it is sold here as a heavy freight item for commercial installation.
Two points to confirm before you buy. First, displacement: the 4-cylinder 3304 is commonly about 7.0L, while the live spec figure of 10.5L actually corresponds to the six-cylinder 3306; confirm the exact displacement and rating by the engine serial number. Second, application: the 3304 was fitted to a defined set of Cat machines and power units, so route fitment to the serial number rather than a broad vehicle list.
| Item | Details |
|---|---|
| Engine | 4-cylinder 3304 (about 7.0L; 10.5L is the 3306). |
| Serial | Confirm displacement, rating, and application. |
| Install | Commercial-grade install and freight. |
The 4-cylinder 3304 (not the six-cylinder 3306)
Displacement and power rating, by the engine serial number
The machine, genset, or pump it will go into
Aspiration (naturally aspirated or turbo 3304B), by serial
| Item | Details |
|---|---|
| INCLUDED | The used 3304 engine as confirmed; ancillaries and configuration vary, confirmed at order. |
| NOT INCLUDED | Cooling package, controls, mounts, and driven equipment unless confirmed at order. |
| Tools You Need | A professional, commercial-grade installer; freight handling for a heavy unit. |
This 3304 is offered for Cat industrial and power applications, confirmed by serial number, including:
| Vehicle | Compatibility |
|---|---|
| Cat construction | Older machines such as the 225 excavator and 930 loader |
| Cat dozers | D4 and D5 of the matching era |
| Power units | 3304B generator sets and pump drives |
This 3304 is offered for the older Cat machines, generator sets, and pumps it was actually fitted to (for example the 225 excavator, the 930 loader, D4 and D5 dozers, and 3304B gensets). The live list also mixed in fabricated and garbled entries: John Deere and Massey Ferguson tractors and a Case IH combine use their own engines, and the 'Workboats: Caterpillar C9, Cummins QSM11' entry lists engine models as if they were boats (a Cummins is a competitor engine). Those were not reproduced. Confirm the application by the engine serial number. We disclose the serial and configuration before shipping.
Not sure this 3304 suits your machine or power unit? Call (240) 301-0095 with the engine serial number. Our team confirms displacement, rating, and application before your order ships.
Quality control for this part includes:
This is a used commercial diesel. We confirm it is the 4-cylinder 3304, record the serial number so displacement and rating can be verified, and disclose the configuration. Installation is a commercial-grade job; use a professional installer and plan for freight handling of a heavy unit.
| Engine Type | 4-cylinder, 4-stroke industrial diesel |
|---|---|
| Horsepower | About 75 to 130 hp by rating |
| Displacement | Confirm by serial (4-cylinder 3304 commonly about 7.0L; 10.5L is the 3306) |
| Torque | About 350 to 400 lb-ft |
| Aspiration | Naturally aspirated (turbo 3304B variants exist) |
| Bore X Stroke | Confirm by serial (live 105 x 127 mm is inconsistent with 10.5L) |
| Compression Ratio | About 16:1 (live '16:01' is a typo) |
| Cooling System | Water-cooled |
| Electrical System | 24V |
| Fuel System | Direct injection |
| Fuel Type | Diesel |
| Valvetrain | OHV |
| Shipping | Commercial freight to all 50 states, no core charge |
| Condition | Used |
| Sku | vaz225 |
Contact (240) 301-0095 within 15 days of delivery.
