Product Details
Assembly 233-1161 operates as a fully self-contained GP-class unit injector engineered for Caterpillar 3066 and 3064 inline-six diesel drivetrains in mid-tonnage hydraulic excavators and industrial power units. It consolidates the needle valve, atomizer tip, bias spring, adjusting screw, and pressure-intensifying plunger into one nitrided carbon-alloy steel cartridge that seats into the head cup via a 24 mm class flange and CAT-spec copper crush washer. Relative to its 212-8470 predecessor, 233-1161 carries a revised shim stack and marginally stiffer spring elevating mechanical crack pressure into the 215–230 bar band (vs 200–220 bar on early 212-8470) and tightening needle-lift variance to ±0.02 mm. Spray geometry remains a 150°-class hollow cone through a 5–6 hole DLLA-type tip. It sustains invariant plume symmetry across 1,800–2,400 rpm load sweeps and ambient thermal drift from −25 °C to +110 °C. Cross-reference aliases: 2331161, CA2331161, backward-compatible screw-in replacement for 212-8470 where engine ID plate carries the 233-1161 designation.
Video Description
Product Parameters
| Part Number | 233-1161 |
| Items |
Fuel Injector |
| Type |
Oil pump, oil nozzle |
| Condition | New |
| Material | 45# steel |
| Compatible Models | Caterpillar CAT 311C 312C 314C 318C 320C 320D 321C Excavator 3066 3064 Engine |
| Price | $9.5-$10 |
| Shape | Standard injector shape |
| Working Temp | Adapt to diesel engine normal working temperature |
| Lead Time | 3-10 working days (According to quantity and seasons, the lead time is different) |
| MOQ | 4 PC |
| OEM | Acceptable (customized tag, label, logo) |
| Sample | Available (sent first for quality inspection) |
Our Advantages
Built with top-tier thermally robust alloy substrates, this high-precision fuel regulating device sustains steady fluid motion and balanced particulate spreading amid erratic pressure fluctuations and continuous thermal fatigue. Each finished assembly receives thorough performance calibration to elevate fuel utilization efficiency, resolve inconsistent cold-start combustion faults, and restrict carbon deposition on inner cylinder wall surfaces. Accurately optimized internal flow geometries boost peak torque output, diminish per-cycle fuel draw, and minimize hazardous exhaust emission volumes. Engineered for hassle-free toolless installation and convenient field maintenance, its heavy-duty outer housing adapts seamlessly to commercial transport fleets, earthworks machinery, and static power generation units. Routine batch quality assessments sustain uniform operational specifications for all overseas shipments, with tailored procurement support available through formally authorized regional distribution networks.
FAQ
1.If 233-1161 replaces 212-8470, can I just swap labels and run it on an early 320C?
Physically yes - flange, threads, cup seat, and electrical/pump drive geometry are identical, so it drops into any 3066 head that accepted 212-8470. But 233-1161 runs ~10–15 bar higher crack pressure and a stiffer needle return; on an early 320C ECU/rack map tuned for 205 bar it will delay injection timing by ~0.3 ms, giving slightly higher EGT at 80% load and a touch more cold-start crank cycle. Mechanically safe, calibratively off-spec. Bench-pop to confirm, or re-map idle/rack if fleet-critical.
2.Does 233-1161 use the same DLLA tip as 212-8470, or did CAT change the nozzle element too?
The holder-side body is dimensionally the same, but the inserted nozzle tip sub-suffix under 233-1161 often carries a slightly larger sac volume (~0.18 mm³ vs ~0.15 mm³ on early 212-8470 tips) and a 0.01 mm finer hole-edge chamfer to stabilize the higher-pressure spray. The tip is not sold separately under 233-1161 - it is pre-assembled and pop-calibrated at CAT; field disassembly voids the calibration. Treat 233-1161 as a sealed unit, not a tip-and-body combo.
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