This is the Bosch 0432131840, a new mechanical fuel injector for Cummins B Series engines: the 4BT 3.9L four-cylinder and the 6BT 5.9L six-cylinder. It is a complete nozzle and holder assembly with the 7 mm nozzle tip, set and ready to fit, not a rebuild. It replaces Cummins 3919302, 3802327 and 3914473. The holder is a Bosch KDAL59P7 and it opens at 245 to 259 bar. It is sold outright, with no core to send back.

A worn mechanical injector shows up as hard starting, white or black smoke, a rough idle, fuel knock or a loss of power. Low opening pressure and a dribbling nozzle are the usual causes. Replace the sealing washer under the nozzle when you fit a new injector, and it is good practice to do the full set so the cylinders stay balanced. B Series injectors look alike and differ by build, so order by the number on your old injector. Its close relative is the Bosch 0432131835 (Cummins 3919343): Bosch gives both the same opening pressure, and several catalogs supply the 0432131835 for Cummins 3919302 as well. The 0432131749 (Cummins 3929490) opens a little lower, at 240 to 254 bar, and is a separate injector.

Specifications

Fits / Applications

• Cummins B Series 4BT 3.9L engines, four-cylinder, that call for injector 3919302
• Cummins B Series 6BT 5.9L engines, six-cylinder, that call for injector 3919302
• Engines whose parts book lists Cummins 3802327 or 3914473
• Four injectors on the 3.9L, six on the 5.9L
• Order by the number on the old injector or by engine serial number and CPL

Clean the injector bore before fitting, use a new sealing washer under the nozzle, and torque the hold-down to the engine maker’s figure. Cap the lines while they are open, bleed the high-pressure lines after fitting, and change the fuel filter.

Part Numbers & Cross Reference

Bosch 0432131840  ·  Cummins 3919302  ·  Cummins 3802327  ·  Cummins 3914473  ·  Bosch nozzle holder KDAL59P7

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 0432131840 replace?

Cummins 3919302, 3802327 and 3914473. The holder is a Bosch KDAL59P7.

Is it the same as the Bosch 0432131835?

They are two Bosch numbers with different holders: KDAL59P7 on this one, KDAL59P5 on the 0432131835. Bosch gives both the same opening pressure, 245 to 259 bar, catalogs list Cummins 3802327 under both, and several supply the 0432131835 for Cummins 3919302 too. For an exact match, order the number on your old injector.

Which engines take the Bosch 0432131840?

Catalogs list it for the Cummins B Series 4BT 3.9L and 6BT 5.9L. Only the builds that call for Cummins 3919302 use it, so call 530-668-0818 with the engine serial number and CPL if you are not sure.

Is the 0432131840 new, and is there a core?

It is a new Bosch nozzle and holder assembly, 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 Mechanical Fuel Injector (3926819, 3802547) | Bosch 0432133861 New
• Cummins 4BT 3.9L & 6BT 5.9L, Case & Case IH Mechanical Fuel Injector (3929490, J929490) | Bosch 0432131749 New
• Cummins 4BT 3.9L, Case, Kobelco VE4 Injection Pump 0460424081 | Bosch Authorized Remanufactured by VFI
• Bosch VE Rotary Diesel 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.