This is the Bosch 0432133858, a new nozzle and holder assembly for the Cummins 6BT 5.9L 12-valve engine at the rating of about 210 hp (155 kW). It replaces Cummins 3926820 and the Cummins service number 3802548. The injector body carries the ID 6820, the holder is a Bosch KDAL59P6 and the nozzle tip is 7 mm. It is a Bosch-made part, sold each, and the engine takes six.

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. Several B-series injectors share the KDAL59P6 holder and are built for different ratings, so match the Cummins number or the body ID, not the shape.

Specifications

Fits / Applications

• Cummins 6BT 5.9L, 12-valve, about 210 hp (155 kW)
• Engines that call for Cummins injector 3926820 or service number 3802548
• Old injector stamped with body ID 6820
• Six injectors per engine

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 0432133858  ·  Cummins 3926820  ·  Cummins 3802548  ·  Cummins ReCon exchange 3802548RX  ·  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

Will the Bosch 0432133858 fit my Dodge Ram 12-valve?

Two catalogs list this number together with Bosch 0432133844, the injector catalogs give for the 1996 to 1998 Ram with the manual transmission. Other catalogs keep the two apart, and other years and the automatic trucks take different injectors. Call 530-668-0818 with the number on your old injector before you order for a pickup.

What numbers does the 0432133858 replace?

Cummins 3926820 and the Cummins service number 3802548, also shown as 3802548RX. The body ID stamped on the injector is 6820.

How is it different from the 0432133878 and 0432133861?

All three are listed for the mechanical 5.9L under different Cummins numbers. The 858 is Cummins 3926820 at about 210 hp. The 878 is Cummins 3919092 and the 861 is Cummins 3926819, both listed at about 190 hp, and the 861 is also listed for the 4BT.

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 6BT 5.9L 12-Valve Mechanical Fuel Injector, 190 hp (3919092, 3802255) | Bosch 0432133878 New
• Cummins 4BT 3.9L & 6BT 5.9L Mechanical Fuel Injector (3926819, 3802547) | Bosch 0432133861 New
• Cummins 6BTA 5.9L Marine Mechanical Fuel Injector (3897197, 3802621) | Bosch 0432133854 New
• Dodge Ram 5.9L 12-Valve Cummins VE Injection Pump 0460426184 | 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.