This is the Alliant Power AP66955, a remanufactured G2.9 fuel injector for the 2010 to 2014 International MaxxForce DT, the 7.6L (466 cu in) inline six, at 215 to 300 hp. It replaces Navistar 1890055C91, 1890055C92, 1890056C2 and 5010715R91. Navistar’s own service information gives 1890055C92 as the injector for the 2010 MaxxForce DT. It is remanufactured by PurePower Technologies (PPT), the original-equipment supplier of the G2.9 to Navistar, and sold under the Alliant Power name. Each one gets a new coil, coil harness, connector and spool valve. It comes with the chamber gasket fitted and two injector seal rings.

A miss or rough running, hard starting, low power and a check engine light with injector circuit codes are the usual reasons these come out. The G2.9 is fired by high-pressure engine oil, so a leaking oil rail seal, a weak high-pressure oil pump, low or dirty oil, or a damaged harness under the valve cover gives the same complaints. Rule those out before you replace a set. The engine takes six injectors. A second injector, AP66957, replaces Navistar 1884057C92 on some MaxxForce DT engines, so check the number on your old injector before you order.

Specifications

Fits / Applications

• International MaxxForce DT, 7.6L, 2010 to 2014, 215 to 300 hp
• Replaces Navistar 1890055C92, which Navistar lists for DT (466) engines only
• Catalogs list International 4300, 4300LP, 4400 and 4400LP trucks built with this engine. Order by engine, not by truck model.
• MaxxForce DT newer than 2014: PurePower and Interstate-McBee list this Navistar injector from model year 2010 forward. Call with the engine serial number.
• Not for the 2007 to 2010 MaxxForce DT with engine serial 3,000,001 through 3,300,000, which takes AP66918
• Not for engines whose old injectors carry Navistar 1884057C92 or 1884058C2, which take AP66957
• Not for the MaxxForce 9 and 10, which take AP66958 in these years
• Six injectors per engine

The high-pressure oil rail has to come off to change these injectors. The rail’s injector inlet seals must be replaced before it goes back on: use the Alliant Power AP0025 high-pressure oil rail seal kit, which is not in the box. The injectors are fired by engine oil pressure, so change the engine oil and oil filter when you fit them.

Part Numbers & Cross Reference

Alliant Power AP66955  ·  Navistar 1890055C91  ·  Navistar 1890055C92  ·  Navistar 1890056C2  ·  Navistar 5010715R91  ·  PurePower Technologies 6932-PP  ·  Alliant Power (interchange) AP66855

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

My MaxxForce DT is rated 215 or 225 hp. Do I need the AP66955 or the AP66957?

Go by the Navistar number on your old injector, not by horsepower. AP66955 replaces 1890055C92 and 1890056C2, and AP66957 replaces 1884057C92 and 1884058C2. If you cannot read the number, call 530-668-0818 with the engine serial number.

Will the AP66955 fit a 2007 to 2010 MaxxForce DT?

Not the earlier build. Engines with serial numbers 3,000,001 through 3,300,000 take AP66918. The AP66955 is for the 2010 to 2014 MaxxForce DT.

What numbers does the AP66955 replace?

Navistar 1890055C91, 1890055C92, 1890056C2 and 5010715R91, and PurePower 6932-PP.

Is the AP66955 new or remanufactured, and what else do I need?

It is remanufactured by PurePower Technologies for Alliant Power, and a refundable core applies. It comes with the chamber gasket fitted and two seal rings. You also need the Alliant Power AP0025 oil rail seal kit, because the high-pressure oil rail has to come off.

Related Parts

• International MaxxForce DT G2.9 Fuel Injector | Alliant Power AP66918 Remanufactured (2007-2010, 210-300 hp)
• International MaxxForce 9 & 10 G2.9 Fuel Injector | Alliant Power AP66921 Remanufactured (2007-2010)
• International MaxxForce 9 & 10, N9 & N10 G2.9 Fuel Injector | Alliant Power AP66958 Remanufactured (2010-2017)
• 2007-2010 International MaxxForce DT 12cc High-Pressure Oil Pump | Alliant Power AP63696 Remanufactured

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.