This is the Bosch 0432133787, a new nozzle and holder assembly for the Cummins 5.9L B series in its 6BT and 6BTAA forms. It replaces Cummins 3939696 and 4089270, and catalogs also list it by the short body number 9696. The same injector is listed for some 4-cylinder 3.9L B series engines and for Case and JCB machines built with these engines. Opening pressure is 260 to 274 bar. It is the complete injector, set and ready to fit.

Mechanical injectors wear at the nozzle. A dribbling or stuck nozzle shows up as a miss, black or white smoke, fuel knock, hard starting or fuel in the oil. Pop test the old set before you condemn the pump. Replace them as a full set, one per cylinder, so every cylinder opens at the same pressure. Bosch 0432133854 is the 6BTA marine injector and replaces Cummins 3897197. It carries a different Cummins number, so do not mix the two.

Specifications

Fits / Applications

• Cummins 6BT 5.9L B series
• Cummins 6BTAA 5.9L B series
• 4-cylinder 3.9L B series engines that list injector 3939696 or 4089270
• Case machines with the Cummins 5.9L that list injector 3939696
• JCB machines with the Cummins 5.9L that list injector 3939696 or 4089270
• Match by Cummins number 3939696 or 4089270, not by engine model alone

Fit a new sealing washer under each injector and clean the bore first. Tighten the hold-down and the line nuts to the engine maker’s figures, bleed the lines, and check for leaks at the return connections. Change the fuel filters at the same time.

Part Numbers & Cross Reference

Bosch 0432133787  ·  Cummins 3939696  ·  Cummins 4089270

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 Cummins numbers does the Bosch 0432133787 replace?

Cummins 3939696 and 4089270. Catalogs also list it by the short body number 9696.

Will it fit any 5.9L Cummins 6BT?

No. The 5.9L B series ran many injectors by rating. This one is for engines that list Cummins 3939696 or 4089270. Call 530-668-0818 with your engine serial number and CPL and we will check it.

Is the Bosch 0432133787 new or rebuilt, 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 send back.

Does it fit Case and JCB machines or a 4-cylinder Cummins?

Catalogs list it for Case and JCB machines with the Cummins 5.9L and for some 4-cylinder 3.9L B series engines. Check that your parts list shows Cummins 3939696 or 4089270 before you order.

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 4B & 4BT 3.9L Mechanical Fuel Injector (3964919, 4089468) | Bosch 0432133773 New
• Cummins 4BT 3.9L, Case, Kobelco VE4 Injection Pump 0460424081 | Bosch Authorized Remanufactured by VFI
• Mechanical Diesel Injector Testing & 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.