Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D Diesel Injector
Cross-Reference & Technical Specs
Authoritative technical specifications, verified Bosch part numbers, control valve stamping codes, nozzle spray orifices, and hold-down tightening torque for the Caterpillar C4.4 diesel engine family.
All Verified Part Numbers for Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D
The following 3 common-rail injector assemblies are calibrated for this engine family. Click any SKU to view individual test bench flow curves, sister cross-references, and vehicle applications.
Bosch 320-0680 Common Rail Injector for Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D →
CATERPILLAR CRICAT C6.6 CRS Electro-Hydraulic Spool ValveNozzle Code: G3S33 / Multi-Hole Common Rail NozzleBosch 326-4700 Common Rail Injector for Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D →
CATERPILLAR CRI095000-5341 Valve AssemblyNozzle Code: DLLA152P947Bosch 0445120289 Common Rail Injector for Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D →
CATERPILLAR CRIF00RJ02266Nozzle Code: DLLA153P1721| Part Number (SKU) | Primary OE Reference | Control Valve | Nozzle Code |
|---|---|---|---|
| 2645A747, 10R-7672, 321-3600 | CAT C6.6 CRS Electro-Hydraulic Spool Valve | G3S33 / Multi-Hole Common Rail Nozzle | |
| 10R-7673, 326-4701, 326-4702 | 095000-5341 Valve Assembly | DLLA152P947 | |
| 2645A749, 2645A737, 2645A745 | F00RJ02266 | DLLA153P1721 |
Verified Vehicle Compatibility
| Make / Manufacturer | Vehicle Model & Platform | Engine Specification | Model Years |
|---|---|---|---|
| Caterpillar | 320D / 320D L / 320D LN | Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D | 2006-2015 |
| Caterpillar | 323D / 323D L / 323D LN | Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D | 2006-2015 |
| Caterpillar | 321D LCR Short Radius Excavator | Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D | 2006-2014 |
| Caterpillar | 924H / 928H / 930H Wheel Loader | Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D | 2007-2015 |
| Caterpillar | D6K / D6N Track-Type Tractor / Dozer | Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D | 2007-2016 |
| Perkins | 1106D-E66TA Industrial & Genset Engine | Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D | 2006-2020 |
| Caterpillar | 320D / 320D L Hydraulic Excavator | Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D | 2006-2015 |
| Caterpillar | 320D LN / 320D LRR Compact Excavator | Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D | 2006-2015 |
| Caterpillar | 321D LCR Reduced Radius Excavator | Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D | 2006-2014 |
| Caterpillar | 323D / 323D L Hydraulic Excavator | Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D | 2006-2014 |
| Perkins | 1104D-E44T / 1104D-E44TA Generator & Industrial | Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D | 2008-2020 |
| Caterpillar | 416E / 420E / 428E Backhoe Loader & C4.4 | Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D | 2008-2020 |
Installation, Tightening Torque & Re-torque Protocol
Strict torque compliance is mandatory on Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D common-rail cylinder heads. Over-torquing stretches the injector body or strips the head clamping threads, while under-torquing allows combustion blow-by past the copper sealing washer:
- Hold-down clamp bolt: 30 N·m (cold state). Always clean the cylinder head recess with an injector seat reamer.
- High-pressure rail flare nut: 25-30 N·m using a dedicated 17 mm line wrench.
- Return leak-off banjo bolt: 9-12 N·m with fresh copper washers on both sides of the banjo union.
After fitting replacement injectors on Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D, generate or program the cylinder-specific IMA calibration code into the engine ECU using an OEM-level scan tool (Bosch KTS, Renault CLIP, or VAG-COM) to prevent cylinder power imbalance and rough idle.
Technical Diagnostics FAQ for Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D
What DTC fault codes indicate a failing injector on Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D?
The most frequent fault codes are P0201 through P0204 (Injector Circuit Malfunction on Cylinders 1-4), P2146/P2149 (Injector Group Supply Voltage Error), and P0087 (Fuel Rail Pressure Low due to excessive internal leak-off). Measure solenoid coil resistance across the pins (0.5-1.5 Ω) and perform a graduated-bottle dynamic leak-back test to pinpoint the leaking cylinder.
Can sister SKUs within the Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D family be interchanged?
Not unless explicitly confirmed on the vehicle build plate. While sister SKUs share the same physical outer envelope and CAT C6.6 CRS Electro-Hydraulic Spool Valve control valve, they differ in nozzle spray orifice angle and factory IMA flow calibration. Mixing sister SKUs on the same engine block can trigger rough idle, elevated exhaust gas temperatures (EGT), and MOT emissions failure.
Which specific Bosch injectors fit the Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D engine?
The verified genuine Bosch common-rail injectors engineered for the Caterpillar C4.4 / C6.4 / C6.6 ACERT & Perkins 1104D / 1106D engine family are:
- Bosch 320-0680 Common Rail Injector → (OE: 2645A747, 10R-7672, 321-3600, 295-9130, 10R-7670, 2645A749, 2645A734, 2645A717, 5256607, 2645A751, 10R-7671) — Control Valve: CAT C6.6 CRS Electro-Hydraulic Spool Valve, Nozzle Code: G3S33 / Multi-Hole Common Rail Nozzle
- Bosch 326-4700 Common Rail Injector → (OE: 10R-7673, 326-4701, 326-4702, 321-3600, 095000-5342, 095000-5340) — Control Valve: 095000-5341 Valve Assembly, Nozzle Code: DLLA152P947
- Bosch 0445120289 Common Rail Injector → (OE: 2645A749, 2645A737, 2645A745, 2645A746, 320-0670, 10R-7670) — Control Valve: F00RJ02266, Nozzle Code: DLLA153P1721