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Caterpillar 3406B & 3406C Parts

Parts for the Caterpillar 3406B and 3406C — the inline-six workhorses that ran fleets through the mechanical era and into Cat's first electronic engine controls. These engines are simple, durable, and still on the road, but many original part numbers have been superseded over the years. That's where we help. JAK'S Diesel stocks PAI Industries aftermarket components and our own JAK'S Diesel Heads cylinder heads for this platform: heads, injectors, turbochargers, gaskets, and full rebuild kits.

Have an old CAT number that no longer crosses clean? Send it over. We'll match the current replacement and confirm fitment before you buy. Same-day shipping from Colorado; free freight over $1,000.

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Choosing the Right Caterpillar 3406B & 3406C Parts

Heavy-duty diesel components must be matched to the exact engine and application. Before ordering from this collection, verify the part number, engine model, engine serial number, and any casting or calibration number shown on the original component.

Fitment information to have ready

  • OEM, dealer, casting, or interchange part number
  • Engine manufacturer, model, and engine serial number (ESN)
  • Truck year and model when the component is chassis-specific
  • Core details for remanufactured or exchange components

Need a fitment check?

Use the OEM cross-reference tool or text a clear photo of the part tag to (720) 445-6249. A JAK'S Diesel specialist can confirm the match before the part ships.

Got a Number We Don't List?

Text a photo of the part tag — a specialist crosses it and quotes you fast.

Text a Part-Tag Photo(720) 445-6249