QX700 Common Rail Injector Ultrasonic Cleaner | 7L Heated Bath With Sweep-Frequency Transducers & Anti-Corrosion Basket Set

The common rail injector operates with internal clearances measured in microns-the control valve spool-to-bore gap is typically 3–5 µm, and the needle guide clearance is 4–7 µm. Any residual deposit-whether lacquer from fuel oxidation, carbon particles from combustion blow-by, or abrasive wear debris-that remains in these clearances after overhaul will alter the injector's hydraulic characteristics. A deposit layer of just 2 µm thickness on the control spool can reduce its effective stroke by nearly 5%, changing the injection quantity by 2–3 mm³/stroke and potentially triggering diagnostic trouble codes related to cylinder balance. Traditional soaking or manual brushing cannot reach these internal passages; only ultrasonic cavitation-the implosion of microscopic bubbles that generates localized pressures exceeding 1,000 bar-can dislodge these tenacious deposits. The QX700 Common Rail Injector Ultrasonic Cleaner is a purpose-built 7-liter benchtop system with sweep-frequency transducers and a heated bath, optimized for the precision cleaning of disassembled injector components without causing surface erosion or dimensional change.

Standard ultrasonic cleaners operate at a fixed frequency-typically 40 kHz. This creates standing waves within the tank, resulting in "hot spots" where cavitation is intense and "cold spots" where cleaning is minimal. The QX700 employs a sweep-frequency generator that oscillates between 38 kHz and 42 kHz at a rate of 100 Hz. This continuous frequency modulation moves the cavitation nodes around the tank, ensuring that every component-regardless of its position in the basket-receives uniform cleaning energy. Independent testing shows that sweep-frequency operation reduces cleaning time by 30% compared to fixed-frequency units while improving consistency.

Frequency Range: 38–42 kHz (sweep rate 100 Hz)

Ultrasonic Power: 240 W (peak), 180 W (average)

Transducer Type: Piezoelectric, bonded to the tank bottom with high-temperature epoxy.

The QX700 tank measures 300 mm x 150 mm x 150 mm (L x W x H), providing sufficient capacity for:

A full set of six injector bodies (with solenoids removed)

Control valve assemblies and armature plates

Nozzle needles and guide bushings

Filter screens and retaining rings

The anti-corrosion stainless steel basket (included) has a mesh aperture of 1.5 mm, small enough to retain screws and shims while allowing cavitation energy to pass through unimpeded. The basket is suspended above the tank bottom by 20 mm, preventing the high-intensity cavitation at the tank floor from eroding the components.

The effectiveness of ultrasonic cleaning increases significantly with temperature-up to 50–60°C for aqueous detergents, and up to 70–80°C for solvent-based cleaners. The QX700 incorporates a 1,200 W immersion heater with a PID controller that maintains the bath temperature within ±1°C of the set point. The heater is located beneath the tank bottom, isolated from the cleaning fluid, eliminating the risk of localized overheating or thermal damage to sensitive components.

Temperature Range: Ambient to 80°C (adjustable in 1°C increments)

Temperature Stability: ±1°C

Heater Power: 1,200 W (fast heat-up: 25°C to 60°C in 12 minutes)

Air dissolved in the cleaning fluid dampens cavitation-micro-bubbles collapse less violently in gas-rich fluid. The QX700 includes a degassing mode that runs the transducers at 20% power for 10 minutes, releasing dissolved gases from the fluid before the full cleaning cycle begins. This increases cavitation intensity by up to 25%, as measured by the aluminum foil erosion test (a standard method for ultrasonic cleaner performance evaluation).

Q1: Why can't I just use a standard shop ultrasonic cleaner for injector parts?
A: Most general-purpose cleaners operate at a fixed frequency (often 40 kHz) and lack the power density required for diesel deposits-the hard carbon and lacquer that forms in injector passages requires higher energy and the sweep-frequency feature to avoid standing wave patterns. The QX700's power (240 W peak) is double that of typical 7-liter cleaners.

Q2: What type of cleaning fluid should I use?
A: For heavy carbon deposits, use a proprietary diesel injector cleaner (water-based alkaline formula). For lacquer removal, a hydrocarbon-based solvent is more effective. The QX700 is compatible with both; the choice depends on the contamination type. We offer a starter kit of fluids for common rail injector cleaning.

Q3: Will the ultrasonic cleaning damage the precision-ground surfaces of the injector parts?
A: Cavitation can erode soft materials, but injector components are hardened to HRC 55–60. At the power level of the QX700 and the recommended cycle times (under 20 minutes), there is no measurable surface erosion-confirmed by surface profilometry tests showing Ra changes of less than 0.02 µm after 100 cleaning cycles.

Q4: How often should I change the cleaning fluid?
A: Change the fluid when it becomes visibly dark or when cleaning performance noticeably decreases. For a workshop cleaning 5 injector sets per day, we recommend changing the fluid every 2 days. The QX700's drain valve (located at the bottom of the tank) allows for easy fluid change.

Q5: Can I use the QX700 for piezo injectors as well as solenoid types?
A: Yes, but remove the piezo stack before cleaning-the piezoelectric crystals can be damaged by the ultrasonic vibrations. The QX700 is designed for cleaning disassembled components only; the injector must be fully disassembled before immersion.

Q6: The sweep-frequency feature seems technical-does it really make a difference?
A: Yes. In a fixed-frequency tank, you can test cleaning uniformity by placing aluminum foil strips at different positions in the tank-the foil will be perforated more in some areas than others. With sweep-frequency, the perforations are uniform across the entire tank. This translates to consistent cleaning of all components, regardless of their position in the basket.

 

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