The Caterpillar 3306 and 3306B are legendary inline-6 mechanical diesel engines — proven workhorses powering Cat's iconic motor graders (12G, 12H, 140G, 140H, 143H, 14G, 160H series) and D6 bulldozers (D6H, D6D, D6R) that have shaped road construction and earthmoving operations worldwide for decades. The 3306 uses individual mechanical fuel injectors — each injector is a self-contained unit delivering high-pressure fuel directly to the cylinder. When an injector fails, you'll experience rough running, misfires, excessive black smoke, hard starts, power loss, and increased fuel consumption. This brand-new aftermarket fuel injector is a direct replacement for the Cat 3306/3306B engine with six cross-reference formats across Cat OEM and Cat exchange part numbers, including Cat 7W-7038 and exchange reference 0R-4124.

✅ Direct-Fit Compatibility

• Caterpillar Engines: 3306, 3306B (inline-6 mechanical diesel)
• Cat Motor Graders: 12G, 12H, 12H ES, 12H NA, 140G, 140H, 140H ES, 140H NA, 143H, 14G, 160H, 160H NA
• Cat Bulldozers: D6H, D6H XL, D6H XR, D6D, D6R
• Bolt-on replacement — no modifications required

🔧 Product Highlights

• 100% Brand New Aftermarket: Not rebuilt or refurbished — starts with a full service life
• OEM-Spec Mechanical Injection: Correct injection pressure and spray pattern for the Cat 3306/3306B mechanical fuel system
• Targeted Single-Unit Replacement: Ideal when diagnostics confirm one failed injector on a specific cylinder
• 6 Cross-Reference Formats: Covers Cat OEM (7W-7038, CA7W7038) and Cat exchange (0R-4124, CA0R4124) in multiple formats
• No Dealer Markup: OEM-equivalent quality at aftermarket pricing

📦 What's Included

• 1 × Fuel Injector (7W-7038 / 0R-4124)

🔑 Key Specs

• Cat OEM Part Numbers: 7W-7038, 7W7038, CA7W7038
• Cat Exchange References: 0R-4124, 0R4124, CA0R4124
• Injector Type: Mechanical fuel injector
• Engine: Caterpillar 3306, 3306B (inline-6 mechanical diesel)
• Condition: 100% New Aftermarket
• Quantity: 1 piece (single cylinder replacement)
• Fitment: Cat 12G / 12H / 140G / 140H / 143H / 14G / 160H motor graders; D6H / D6D / D6R bulldozers

Replacing all six injectors? Our 6-pack (SKU: 7W-7038) offers complete engine coverage at a lower cost-per-injector. Please verify your equipment model, serial number, and existing injector part number before ordering. Contact us for fitment confirmation if needed.