This is the Bosch 0432131743, a new mechanical fuel injector for Cummins B Series engines. Catalogs list it for the 3.9L four-cylinder (4B, 4BT) and the 5.9L six-cylinder (6B, 6BT). It is a complete nozzle and holder assembly, set and ready to fit, not a rebuild. It replaces Cummins 3930131, 3802748 and 3930168 and Case IH / New Holland J930131. The holder is a Bosch KDAL59P6 and it opens at 240 to 254 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. Cummins built the B Series with many injectors that look alike and differ by build, so order this one by number. The Bosch 0432131749 (Cummins 3929490) opens at the same pressure but is a separate Bosch number. The 0432131835 (Cummins 3919343) and the 0432131840 (Cummins 3919302) open a little higher, at 245 to 259 bar.

Specifications

Fits / Applications

• Cummins B Series 3.9L four-cylinder engines, 4B and 4BT, that call for injector 3930131
• Cummins B Series 5.9L six-cylinder engines, 6B and 6BT, that call for injector 3930131
• Engines whose parts book lists Cummins 3802748 or 3930168, or Case IH / New Holland J930131
• 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 0432131743  ·  Cummins 3930131  ·  Cummins 3802748  ·  Cummins 3930168  ·  Case IH / New Holland J930131  ·  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 0432131743 replace?

Cummins 3930131, 3802748 and 3930168, and Case IH / New Holland J930131. The holder is a Bosch KDAL59P6.

Which engines take the Bosch 0432131743?

Catalogs list it for the Cummins B Series 3.9L four-cylinder and 5.9L six-cylinder. Only the builds that call for Cummins 3930131 use it, so read the number off the old injector or call 530-668-0818 with the engine serial number.

Is it the same as the Bosch 0432131749?

They are two Bosch numbers. This one is Cummins 3930131 and the 0432131749 is Cummins 3929490. Bosch gives both the same opening pressure, 240 to 254 bar. Order by the number on your old injector, or call us and we will check which one your engine takes.

Is the 0432131743 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 (3926819, 3802547) | Bosch 0432133861 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.