This is the Alliant Power D4W7017, a new 7000 Series fuel injector nozzle for Caterpillar 3406B, 3408 and 3412 mechanical engines. It is a new pencil nozzle, not a rebuild. It takes the place of Cat 4W7017, which replaced the older Cat 8N7007, and catalogs also cross it to Cat 8N7006. Cat’s own remanufactured numbers for this nozzle are 0R3421 and 0R1744. Catalogs list Cat 4W7017 for 3406B truck engines, the 980C and 980F wheel loaders and the 3406 engine in the 623F and 627F scrapers. It is sold each, one per cylinder.

Hard starting, a miss at idle, black or white smoke, fuel in the oil and high fuel use all point at worn nozzles on these mechanical engines. Nozzles wear as a set, so most shops change every cylinder at the same time and check the injection pump and lines while they are in there. This is a mechanical nozzle with no electrical connector, so there is nothing to code.

Specifications

Fits / Applications

• Caterpillar 3406B engines that use nozzle 4W7017, including 3406B truck engines
• Caterpillar 3408 engines that use nozzle 4W7017
• Caterpillar 3412 engines that use nozzle 4W7017
• Caterpillar 980C and 980F wheel loaders (3406 engine)
• Caterpillar 623F and 627F wheel tractor-scrapers (3406 engine)
• These engines were built with more than one nozzle. Match the number on your old nozzle or send us the engine serial number.

Clean the nozzle bore and seat before fitting, renew the seals, keep the fuel line connections clean while they are open and torque the nozzle and line nuts to the Caterpillar figures for your engine. Bleed the fuel system before starting.

Part Numbers & Cross Reference

Alliant Power D4W7017  ·  Caterpillar 4W7017  ·  Caterpillar, older number 8N7007  ·  Caterpillar, interchange number 8N7006  ·  Caterpillar remanufactured 0R3421  ·  Caterpillar remanufactured 0R1744

Cross-reference numbers can change with engine serial, build year and emissions tier, so treat this list as a starting point. Send us your engine serial number and we will confirm the exact match against your build before anything ships. That check is free and takes a few minutes.

Frequently Asked Questions

Which engines does the D4W7017 fit?

Caterpillar 3406B, 3408 and 3412 engines built with nozzle 4W7017, 8N7007 or 8N7006. Catalogs list it for 3406B truck engines, the 980C and 980F wheel loaders and the 3406 engine in the 623F and 627F scrapers. Call 530-668-0818 with your engine serial number and we will confirm it.

What Caterpillar numbers does the D4W7017 replace?

Cat 4W7017 and the older 8N7007, and catalogs also cross it to 8N7006. Cat sells the same nozzle remanufactured as 0R3421 and 0R1744.

Can I use it in place of Cat 4W7018?

No catalog lists the two as the same part. Cat 4W7018 has its own number list (4W7012, 0R3422, 0R1745) and is sold here as D4W7018, so order by the number on your old nozzle.

Is it new or remanufactured?

It is a new Alliant Power nozzle, not a rebuild. It is sold each, so order one per cylinder: 6 for a 3406B, 8 for a 3408, 12 for a 3412.

Why Buy From Valley Fuel Injection

We are a diesel fuel-injection and turbocharger shop in Woodland, CA, rebuilding pumps, injectors and turbos on our own benches since 1993, not a drop-ship storefront. When you call, you talk to the people who test these units. We verify fitment against your engine serial, VIN or build date before anything ships, so the right part arrives the first time.

Not sure the injectors are the problem? We test and diagnose in-house before you buy. See our common rail injector testing and rebuild service.