Caterpillar 3406B & 3406C Engine Parts, Rebuild Kits & Injection Pumps

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ATL Diesel stocks parts for the Caterpillar 3406B and 3406C — the fully mechanical inline-six that owner-operators still call the "B model." Whether you're doing a top-end refresh, a full in-frame or overhaul, or just chasing down an injection pump or fuel pump, we carry the parts and kits to get your 3406B or 3406C back to work. We've done this for 20 years, and the Cat 3406 family is one of our specialties. Give us your engine serial number at checkout or over the phone and we'll confirm the exact part numbers for your engine before anything ships. What we carry for the Cat 3406B and 3406C This collection covers the full range of 3406B/C parts, from single components to complete kits. The most-ordered categories: Rebuild and overhaul kits — in-frame kits and full overhaul kits with pistons, liners, rings, bearings, and gaskets to bring a high-mileage B model back to spec. Injection pumps and fuel system parts — injection pumps, fuel pumps, fuel filters, and related components for the mechanical fuel system. Cylinder heads and valvetrain — cylinder heads, camshafts, and head components. Turbochargers — new turbos and turbo rebuild kits. Air compressors and Jake brake parts — air compressor rebuild kits and engine brake components. Oil pumps, water pumps, and coolers — the wear items that keep a 3406B running cool and lubricated. Everything is built from quality aftermarket and OEM-equivalent parts. If you don't see the exact part on the page, call us — we can source parts for the 3406B/C that aren't always listed. Is the "B model" the same as the 3406B? Yes. "B model Cat" is trucker shorthand for the Caterpillar 3406B. It's the mechanical version Cat built from roughly 1987 to 1993, before the electronic 3406C and 3406E. If you're searching for "B model" parts, you're in the right place — this collection covers both the 3406B and the 3406C. 3406B vs. 3406C parts The 3406B is fully mechanical. The 3406C started blending in electronic controls in the mid-1990s. A lot