Caterpillar 3304 Engine for Sale | 4-Cyl Industrial Diesel 7L

Description

About the Caterpillar 3304 Engine (4-Cylinder Industrial Diesel)

Need a replacement Caterpillar 3304 engine? Part Nests sources OEM used Caterpillar 3304 industrial diesel engines for Cat 3304 applications. The Caterpillar 3304 is Caterpillar’s classic 4-cylinder industrial diesel engine – part of Caterpillar’s iconic 3300-series industrial engine family used across various Caterpillar construction equipment, industrial power unit, and generator set applications during the classic Caterpillar industrial engine era. CRITICAL engine identification per the source data – the 3304 is a 4-cylinder configuration with approximately 7.0L displacement, distinct from the 3306 which is a 6-cylinder (inline-6) configuration with approximately 10.5L displacement. Do NOT confuse the 3304 4-cylinder with the 3306 6-cylinder – same 3300-series family designation but different specific engine configurations, displacement, and applications. Serial number verification required per the source data – Caterpillar industrial engine identification is primarily by serial number for correct displacement, rating, and application match. Representative Caterpillar 3304 applications include older Cat construction machines (Cat 225 excavator, Cat 930 loader), Cat dozers (D4 and D5 of the matching era), and power units (3304B generator sets and pump drives). The 3304B suffix indicates a specific 3304 variant used across various power unit applications. Commercial-grade professional installer required; freight handling for a heavy unit. Not included: Cooling package, controls, mounts, and driven equipment unless confirmed at order. First of six-engine Caterpillar block in this catalog batch – see our related Caterpillar 3408, 3176, 3204, 3412, and 3208 Marine engine listings for related Cat industrial / marine diesel applications. Each engine is serial-verified with function tested. Call (855) 634-4447 to verify Cat 3304 serial number, displacement, rating, and application before ordering.

Engine and Application Verification

What Is Included and Not Included

Caterpillar 3304 Engine Context (Classic Industrial 4-Cylinder Diesel)

• Caterpillar 3304 industrial diesel: The Caterpillar 3304 is Caterpillar’s classic 4-cylinder industrial diesel engine – part of Caterpillar’s iconic 3300-series industrial engine family. Represents Caterpillar’s classic industrial diesel engineering during the classic Caterpillar industrial engine era. Iconic Caterpillar diesel technology with distinctive Caterpillar engineering and durability reputation
• 3300-series industrial engine family: The 3304 is part of Caterpillar’s 3300-series industrial engine family. Family includes various displacement / cylinder configurations for various industrial applications – 3304 (4-cylinder ~7.0L), 3306 (inline-6 ~10.5L), and various other 3300-series variants used across Caterpillar’s industrial engine lineup during the era
• CRITICAL 3304 vs 3306 distinction: Per the source data engine, 4-cylinder 3304 (about 7.0L; 10.5L is the 3306). Critical Caterpillar engine identification distinction – the 3304 is a 4-cylinder configuration with approximately 7.0L displacement, distinct from the 3306 which is a 6-cylinder (inline-6) configuration with approximately 10.5L displacement. Same 3300-series family designation but different specific engine configurations. Do NOT confuse 3304 (4-cyl) with 3306 (6-cyl)
• Serial number verification critical: Per the source data serial, confirm displacement, rating, and application. Caterpillar industrial engine identification is primarily by serial number – Caterpillar serial numbers provide specific engine displacement configuration, horsepower rating, and application-specific configuration information. Verify serial number for correct application match
• Cat construction applications: Per the source data compatibility, Cat construction – older machines such as the 225 excavator and 930 loader. Representative Cat 3304 applications include the Cat 225 excavator (older construction excavator, matching-era production) and Cat 930 loader (older wheel loader, matching-era production). Various other older Cat construction applications may use 3304 engines
• Cat dozer applications: Per the source data compatibility, Cat dozers – D4 and D5 of the matching era. Representative Cat 3304 applications in Caterpillar’s dozer lineup include the Cat D4 and D5 track-type tractor / dozer applications of the matching production era. Verify matching-era production for correct application match
• Power unit applications: Per the source data compatibility, power units – 3304B generator sets and pump drives. Representative Cat 3304 applications in Caterpillar’s power unit lineup include 3304B generator sets (electrical power generation applications) and pump drives (fluid pumping applications). The 3304B suffix indicates a specific 3304 variant used across power unit applications

Industrial Diesel Function and Installation Context

• Industrial diesel function: The Caterpillar 3304 industrial diesel provides primary propulsion / power output for Caterpillar construction equipment applications, or continuous / prime power output for stationary industrial power unit applications (generator sets, pump drives). Standard industrial diesel engine configuration for Caterpillar’s classic industrial engine lineup
• 4-cylinder configuration: The 3304 uses a 4-cylinder inline configuration with approximately 7.0L displacement. Distinctive smaller-displacement 4-cylinder Caterpillar industrial diesel configuration vs the larger 6-cylinder 3306 variant. Appropriate for smaller construction equipment and power unit applications during the era
• Commercial-grade install required: Per the source data install, commercial-grade install and freight. Critical installation requirement – Caterpillar industrial engine installation requires commercial-grade professional installer with heavy equipment / industrial engine service capability. Not a general automotive shop project
• Freight handling required: Per the source data tools note, a professional, commercial-grade installer; freight handling for a heavy unit. Cat 3304 industrial diesel engines are heavy industrial engines requiring specialized freight handling and rigging at delivery. Commercial delivery arrangements required
• Not included items: Per the source data, cooling package, controls, mounts, and driven equipment unless confirmed at order. Standard scope – the used 3304 engine as confirmed is provided. Additional items (radiator / cooling package, electrical controls, engine mounts, driven equipment such as generator end or pump) are separate items – obtain / confirm separately as required

Related Caterpillar / Related Industrial Engine Listings

• Caterpillar 3408 Engine: Related Caterpillar 3400-series application (Cat 3408 18L V8 industrial / marine diesel) – see our Caterpillar 3408 Engine listing
• Caterpillar 3176 Engine: Related Caterpillar 3100-series application (Cat 3176 7.2L inline-6 diesel) – see our Caterpillar 3176 Engine listing
• Caterpillar 3204 Engine: Related Caterpillar 3200-series application (Cat 3204 4-cylinder industrial diesel) – see our Caterpillar 3204 Engine listing
• Caterpillar 3412 Engine: Related Caterpillar 3400-series application (Cat 3412 V12 industrial / marine diesel) – see our Caterpillar 3412 Engine listing
• Caterpillar 3208 Marine Engine: Related Caterpillar 3200-series marine application (Cat 3208 10.4L V8 marine diesel) – see our Caterpillar 3208 Marine Engine listing
• Various Caterpillar / industrial diesel / heavy equipment replacement components available across our Part Nests catalog

Engine Specifications

• Type: OEM used Caterpillar 3304 4-cylinder industrial diesel engine
• Function: Industrial diesel engine provides primary propulsion or prime power output for Cat construction equipment and power unit applications
• Configuration: 4-cylinder ~7.0L displacement, various application-specific configurations – verify by serial number
• What is not included: Cooling package, controls, mounts, and driven equipment unless confirmed at order per the source data
• Tools required: Professional commercial-grade installer; freight handling for a heavy unit per the source data
• Common failure modes: Various age-related industrial diesel wear patterns, cylinder liner wear, injection system wear, various age-related component wear. Symptoms include performance degradation, various engine integration issues
• Testing: Function tested, compression checked, serial-verified per unit before shipment

Vehicle Compatibility

Why Buy From Part Nests

• OEM verified Caterpillar 3304 4-cylinder industrial diesel engine
• Function tested, compression checked, serial-verified per unit
• Support for CRITICAL 3304 (4-cyl ~7.0L) vs 3306 (6-cyl ~10.5L) distinction
• Support for serial number-based displacement, rating, and application verification
• Support for Cat construction (225 excavator, 930 loader), dozer (D4, D5), and power unit (3304B) applications
• Support for commercial-grade installer and freight handling requirements
• Related to broader Caterpillar / industrial diesel listings
• Freight-forwarded to all 50 states (commercial delivery)
• 15 day replacement warranty on component defects
• Support team familiar with Caterpillar 3300-series industrial engine lineage and heavy equipment considerations
• Call (855) 634-4447 to confirm your Cat 3304 serial number, displacement, rating, and application before ordering.