The Caterpillar 3304B is a 7 L 4-cylinder naturally aspirated engine rated at 1800 rpm, producing up to 73 kW. It powers generator sets from Caterpillar, including the 3304. It holds 22 L (5.8 gal) of oil and 32 L (8.5 gal) of coolant.
Also known as: Caterpillar 3304B
Part of the Caterpillar 3304B engine family — 2 variants share parts & fitment.
| Oil capacity | 22.0 L |
|---|---|
| Coolant capacity | 32.0 L |
| Displacement | 7.0 L |
| Cylinders | 4 |
| Aspiration | Naturally Aspirated |
| Rated speed | 1800 rpm |
| Gross power | 73 kW |
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Coolant | 32.0 L | — | |||
| Oil | Caterpillar DEO 10W30 or 15W40 | 22.0 L | — | 500 hr |
Pooled from every document that names this exact engine — confirm the interval and part number against your unit's serial number.
| Type | Item | Value | Unit | Condition |
|---|---|---|---|---|
| Torque | Bearing Nut Torque (129-3253 Spanner Socket, 121-9871 Bearing Nut) | 2375 | N·m | |
| Torque | Bearing Nut Torque (129-3254 Spanner Socket, 119-3711 Bearing Nut) | 2375 | N·m | |
| Torque | Locknut torque (260-0626 Spanner Socket Assembly, 1T-0229 High Torque Locknut) | 985 | N·m | |
| Torque | Solenoid nut torque (FT3198 Solenoid Tool, 352-2733 solenoid) | 3.75 | Nm | +/- .75 |
| Torque | Tightening torque for 369-5916 Lifting Eyebolt (M12 Hex Bit) | 115 | N·m | |
| Torque | Working torque capacity of locknut spanner wrenches (126-6608 / 126-6609) | 950 | N·m |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
| Fluid | Grade | Standard | Ambient | Capacity | Notes |
|---|---|---|---|---|---|
| Coolant | Cat DEAC | Diesel; 3,000 Service Hours or Three Years; annual S·O·SSM Level 2 coolant sampling and analysis | |||
| Coolant | Cat ELC | Diesel; 12,000 Service Hours or Six Years; add Cat ELC Extender at 6,000 service hours or one half of service life; annual S·O·SSM Level 2 coolant sampling and analysis | |||
| Coolant | Cat NGEC | Natural Gas; 16,000 Service Hours or Three Years; use interval that occurs first | |||
| Engine oil | Cat NGEO | Natural Gas | |||
| Engine oil | Cat Arctic DEO SYN SAE 0W-30 | -40°C to 30°C | Engine Crankcase; Industrial Engines | ||
| Engine oil | Cat DEO SYN SAE 5W-40 | -30°C to 50°C | Engine Crankcase; Industrial Engines | ||
| Engine oil | Cat DEO SAE 10W-30 | -18°C to 40°C | Engine Crankcase; Industrial Engines | ||
| Engine oil | Cat DEO SAE 15W-40 | -9°C to 50°C | Engine Crankcase; Industrial Engines | ||
| Grease | Cat Generator Set Grease | Part Number 108-8611 |
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Tools: 207-3440 Loading Mandrel, 207-3442 Ring Pusher, 207-3444 Seal Sizer, 8F-8178 Bolt
Tools: 8T-5243 Adapter Group, 7B-2499 Ring, 6H-4158 Pin, 5F-9306 Arm, 8S-9975 Ram Adapter, 9S-8900 Cylinder Group
Tools: 174-5354 STOR Plug Assembly, 134-2562 Guides, 9S-9334 Plugs, 6N-9155 Pin
Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.
Parts listed by aftermarket suppliers as fitting this engine — leads compiled from supplier catalogs; verify the exact part for your serial number.
Other equipment known to use this engine, via filter-application cross-reference — useful for sourcing parts even when your exact machine isn't listed elsewhere on this page.
The Caterpillar 3304B engine has an oil capacity of 22.0 liters.
The Caterpillar 3304B has a displacement of 7.0 liters with 4 cylinders.
The Caterpillar 3304B powers 1 generator set(s), including Caterpillar 3304.
The Caterpillar 3304B oil change interval is every 500 hours.