This is the Bosch 0432133861, a new nozzle and holder assembly for Cummins B-series engines. Catalogs list it for the 4BT 3.9L four-cylinder and for the 6BT 5.9L six-cylinder at about 190 hp (140 kW), in truck and industrial use. It replaces Cummins 3926819 and the Cummins service number 3802547. The injector body carries the ID 6819 and the holder is a Bosch KDAL59P6. It is a Bosch-made part, sold each.

Hard starting, white or black smoke, a rough idle, fuel knock and fuel in the oil are the usual signs of worn nozzles on these engines. Mechanical injectors wear as a set, so most shops test or replace all of them at once. A weak lift pump, air in the supply line or a worn injection pump cause the same complaints, so rule those out first. Cummins used more than one injector on the 190 hp 5.9L, and several B-series injectors share the same holder. Match the Cummins number or the body ID, not the shape or the rating alone.

Specifications

Fits / Applications

• Cummins 4BT 3.9L four-cylinder builds that call for injector 3926819
• Cummins 6BT 5.9L six-cylinder, about 190 hp (140 kW), builds that call for injector 3926819 or service number 3802547
• Truck and industrial engines, as catalogs list it
• Old injector stamped with body ID 6819
• Four injectors on the 3.9L, six on the 5.9L

Fit a new sealing washer under each injector and make sure the old one is out of the bore. Flush the lines before you connect them, change the fuel filter and bleed the system. Torque the hold-down to the engine manual, not by feel.

Part Numbers & Cross Reference

Bosch 0432133861  ·  Cummins 3926819  ·  Cummins 3802547  ·  Cummins ReCon exchange 3802547RX  ·  Bosch nozzle holder KDAL59P6

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

What numbers does the Bosch 0432133861 replace?

Cummins 3926819 and the Cummins service number 3802547, also shown as 3802547RX. The body ID stamped on the injector is 6819.

Does it fit both the 4BT and the 6BT?

Yes, catalogs list it for the 4BT 3.9L and for the 6BT 5.9L at about 190 hp. It is for the builds that call for Cummins 3926819, so check your old injector or call 530-668-0818 with the engine serial number.

How is it different from the 0432133858 and the 0432133878?

The 858 is Cummins 3926820, body ID 6820, listed at about 210 hp. The 878 is Cummins 3919092, body ID 9092, and is also listed for the 190 hp 5.9L. This one is Cummins 3926819, body ID 6819. Fit the number that came out of the engine and keep one number across the set.

Is it new, and do I send my old injector back?

It is a new Bosch injector, not a rebuild. It is sold outright, so there is no core to return.

Related Parts

• Cummins 4BT 3.9L & 6BT 5.9L Mechanical Fuel Injector (3930131, 3802748) | Bosch 0432131743 New
• Cummins 4BT 3.9L & 6BT 5.9L 7 mm Tip Mechanical Fuel Injector (3919302, 3802327) | Bosch 0432131840 New
• Cummins 4BT 3.9L & 6BT 5.9L B-Series Fuel Injector (3932123, 3802905) | Bosch 0432131694 New
• Cummins 4BT 3.9L, Case, Kobelco VE4 Injection Pump 0460424081 | Bosch Authorized Remanufactured by VFI
• Bosch P7100 Inline Injection Pump Rebuild Service

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.