The Alliant Power D29279 is a new pencil fuel injector, not a rebuild. It is Alliant Power’s own version of the Stanadyne 29279, the 9.5 mm pencil nozzle John Deere fits to turbocharged PowerTech 4.5 L and 6.8 L engines with a mechanical injection pump: the 4045T and 6068T, and the air-to-air aftercooled 4045H and 6068H. John Deere sells that nozzle as RE48786, which replaced RE44508, and the original carries a pink color code. You need four for a 4045 and six for a 6068.

This is the conventional turbo injector of the family. Naturally aspirated 4045D and 6068D engines take the D32262 (Stanadyne 32262, John Deere RE60062, red), and Tier 2 turbo engines take the rate-shaping D38416 (Stanadyne 38416, John Deere RE531436, blue). John Deere sets each to a different opening pressure, so never mix them in one engine. We also list the genuine Stanadyne 29279 for anyone who wants the original brand. Pencil injectors are replaced for hard starting, smoke, rough running, a miss or leaks past the carbon stop seal. Replace them as a set.

Specifications

Fits / Applications

• John Deere PowerTech 4045T 4.5 L turbocharged engines with a mechanical injection pump
• John Deere PowerTech 4045H 4.5 L turbocharged, air-to-air aftercooled engines with a mechanical injection pump
• John Deere PowerTech 6068T 6.8 L turbocharged engines with a mechanical injection pump
• John Deere PowerTech 6068H 6.8 L turbocharged, air-to-air aftercooled engines with a mechanical injection pump
• Engines built with John Deere nozzle RE48786 (Stanadyne 29279). Check the number on your old injector.

Every time a pencil nozzle comes out, fit a new carbon stop seal and seal washer, clean the nozzle bore and make sure the seat in the head is clean and smooth. John Deere torques the hold-down clamp cap screw to 40 Nm (30 lb-ft) and the leak-off line nuts to only 5 Nm (44 lb-in) on the 4.5 L and 6.8 L engines; leak-off lines break if overtightened. John Deere’s opening pressure setting for a new RE48786 nozzle is 255 to 260 bar (3,700 to 3,780 psi), with no more than 7 bar (100 psi) between cylinders.

Part Numbers & Cross Reference

Stanadyne (genuine twin) 29279  ·  Stanadyne (earlier) 29278  ·  John Deere RE48786  ·  John Deere (earlier) RE44508  ·  John Deere (SE number) SE501101  ·  John Deere (SE number) SE500826  ·  John Deere (SE number) SE500827

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 is the difference between the D29279 and the D38416?

Both fit turbocharged 4045 and 6068 engines. D29279 is the conventional nozzle (John Deere RE48786, pink). D38416 is the rate-shaping nozzle John Deere uses on Tier 2 certified engines (RE531436, blue), set to a lower opening pressure. Fit the type your engine was built with.

What numbers does the D29279 replace?

It is the Alliant Power version of Stanadyne 29279, which John Deere sells as RE48786. Older and related numbers are Stanadyne 29278 and John Deere RE44508, SE501101, SE500826 and SE500827.

Is the D29279 a genuine Stanadyne injector?

No. It is a new injector made for Alliant Power to the Stanadyne 29279 pattern. If you want the Stanadyne brand, we list the genuine Stanadyne 29279 as well.

Will it fit a naturally aspirated 4045D or 6068D?

No. Those engines take the D32262 (Stanadyne 32262, John Deere RE60062, red). If you are not sure, call 530-668-0818 with the engine model code and serial number.

Related Parts

• John Deere 4045D & 6068D PowerTech Pencil Fuel Injector | Alliant Power D32262 New (RE60062)
• John Deere 4045H/T & 6068H/T Pencil Fuel Injector | Stanadyne 29279 New (RE48786)
• John Deere 4045H/T & 6068H/T Rate-Shaping Pencil Injector | Alliant Power D38416 New (RE531436)
• John Deere 6068T & 6068D 6.8L DE10 Fuel Injection Pump | Stanadyne 06320 New (RE568067)

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.

Not sure the injectors are the problem? We test and diagnose in-house before you buy. See our common rail injector testing and rebuild service.