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

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

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 of parts carry across both, but some differ, which is exactly why the serial number matters. Send it to us and we'll make sure the injection pump, head, or kit you order fits the engine you actually have.

Rebuild and overhaul kits

If your B model is tired — low power, blow-by, high oil use — a kit is usually the right move. An in-frame kit lets you refresh pistons, liners, rings, and bearings without pulling the engine. A full overhaul kit adds the parts for a complete teardown and inspection when the engine is out of the truck. Not sure which you need? Call and describe the symptoms and we'll point you to the right kit instead of overselling you.

Injection pumps and fuel parts

The 3406B's mechanical injection pump is the heart of the fuel system, and it's one of our most-requested parts. We stock injection pumps, fuel pumps, filters, and rebuild kits for the fuel system. If you're troubleshooting hard starts, low power, or a no-start, the fuel system is the first place to look on a B model.

Looking for specs or more power?

If you're here to check horsepower, torque, or how to turn up a B model rather than to buy parts, read our guide: Cat 3406B specs, horsepower, and how to get more power out of it. It covers the stock ratings, the fuel-rack turn-up, and what it takes to do it without cooking the engine. Then come back here for the injectors, turbo, and kits to do it right.

Related Caterpillar parts

Running a different Cat engine, or cross-shopping the newer models?

Order the right part the first time

The fastest way to get the correct 3406B/C part is to give us your engine serial number. Call (940) 286-4144 and we'll match your part numbers — 20 years on these engines means we usually pull the right one in under five minutes. It beats guessing and sending parts back.

Frequently asked questions

What parts do you carry for the Cat 3406B?

Rebuild and overhaul kits, injection pumps, fuel pumps and filters, cylinder heads, camshafts, turbos, air compressor and Jake brake kits, oil and water pumps, and more. If it's not listed, call us and we'll try to source it.

Is the "B model" the same as the 3406B?

Yes. "B model Cat" is slang for the Caterpillar 3406B, the fully mechanical version. This collection covers both the 3406B and 3406C.

Do you carry 3406C parts too?

Yes. Many parts cross over between the 3406B and 3406C, and some differ. Send your serial number and we'll confirm the right fit.

Do you sell 3406B injection pumps and rebuild kits?

Yes. We stock injection pumps, fuel pumps, and fuel-system rebuild kits for the 3406B/C. Injection pumps are one of our most-requested parts for these engines.

What's in a 3406B rebuild or overhaul kit?

An in-frame kit typically includes pistons, liners, rings, and bearings. A full overhaul kit adds the parts for a complete teardown. Call if you want help choosing between in-frame and full overhaul.

Do you have turbos, air compressors, and Jake brake parts for the 3406B?

Yes — new turbos and turbo rebuild kits, air compressor rebuild kits, and engine brake components are all part of this collection.

How much does a 3406B overhaul kit cost?

It depends on whether you need an in-frame or a full overhaul and which components are included. Call (940) 286-4144 with your serial number for an exact quote rather than a guess.

Are these OEM or aftermarket parts?

We carry quality aftermarket and OEM-equivalent parts. Cat no longer produces new 3406 parts, so reputable aftermarket parts are how these engines stay on the road.

How do I make sure I order the right 3406B part?

Give us your engine serial number at checkout or by phone. It's the only reliable way to confirm part numbers across the 3406B and 3406C variants.

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