Caterpillar 320 Solenoid Wrench – Compact | Single-Purpose Driver With Offset Handle & Anti-Slip Contour Grip

The Caterpillar 320 HEUI injector's solenoid-often referred to as the actuation coil or the poppet valve driver-sits atop the injector body, secured by a retaining ring or a multi-notched collar. Replacing this solenoid is a routine service task, whether due to coil resistance drift (typically exceeding 3.5Ω at 20°C) or insulation breakdown causing intermittent misfires. Yet, this seemingly simple 20-minute job becomes a 45-minute struggle if the technician lacks the correct tool to engage the solenoid's retaining nut. The Caterpillar 320 Solenoid Wrench – Compact (Model SW-320C) eliminates the improvisation-no jury-rigged pin spanners, no ground-down screwdrivers-offering a purpose-built, single-function driver that engages the solenoid collar's drive notches with full-face contact, enabling fast, damage-free removal and reinstallation.

The solenoid retaining collar on the Caterpillar 320 injector (part numbers 320-0674, 320-0678, 320-0693, and 320-0699) has a standard outer diameter of 28 mm with five equally spaced notches. The notch width is 2.5 mm, and the notch depth is 3.0 mm-specifications that remained consistent across all 320 HEUI injector variants. Our wrench features a precision-milled drive head with five square-ground drive lugs, each sized to match the notch profile exactly. The result is a slip-free, zero-backlash engagement that transfers torque directly to the collar's strongest sections, preventing the edge deformation that occurs with round-pin spanners.

Drive Lug Geometry: 2.5 mm width, 3.0 mm height, 90° square shoulders.

Head Diameter: 28 mm (inner clearance), 36 mm (outer body).

Angular Engagement: The lugs are indexed to the notches without requiring visual alignment; the tool self-centers as it is lowered onto the collar.

The 320 injector is often located deep within the engine valley, with limited overhead clearance-especially on articulated dump trucks and wheel loaders where the engine compartment is crowded with oil lines and wiring harnesses. The wrench features a 45° offset handle that positions the operator's hand away from the injector's vertical axis, providing clearance for gloved fingers while maintaining a direct line of force to the collar. The handle length is 150 mm, a balance between leverage (reducing the required hand force) and maneuverability (preventing the handle from hitting the firewall or adjacent components).

Diesel workshop environments are rarely dry; oil, fuel, and coolant residues make tool handles slippery. The wrench's handle is coated with a contoured TPV (thermoplastic vulcanizate) grip that provides a non-slip surface even when contaminated. The grip features a wave-like profile that aligns with the natural curve of the palm, reducing the hand force required to hold the tool in position during rotation. The grip is also chemical-resistant to diesel, brake cleaner, and common workshop solvents, ensuring long-term adhesion.

The wrench serves both directions of rotation:

Removal (counter-clockwise): The drive lugs engage the notches with a positive stop, allowing the operator to break the collar free even if it has been tightened to 80 Nm (the standard specification). The lugs are designed to withstand 100 Nm of static torque without yielding.

Installation (clockwise): The same lugs provide a precise driving surface for reinstalling the collar to the specified torque. The wrench is compatible with a torque adapter (not included) for use with a click-type torque wrench, or it can be used with a simple beam-type wrench for field overhauls.

Q1: The solenoid collar on my 320 injector doesn't have notches; it has holes. Will this wrench fit?
A: No. The SW-320C is designed for the notched collar, which is the standard configuration for the 320 injector family (late 1990s to mid-2000s production). If your injector has a hole-type collar (used on some early 3126B variants), we offer the SW-320H with pin drivers for that configuration.

Q2: Can this wrench be used with a torque wrench for precise tightening?
A: Yes. The drive head incorporates a 1/4" square drive hole on its top face. You can insert a 1/4" drive torque adapter (available separately) to achieve the specified 80 Nm tightening torque. Without the adapter, the wrench is used manually-suitable for field service where a torque wrench is unavailable.

Q3: I've heard that the solenoid collar has left-hand threads on some injectors. Is that true for the 320?
A: No, the 320 solenoid collar uses standard right-hand threads (clockwise to tighten). The confusion arises from the HEUI pump drive, which does have left-hand threads on some applications. The injector solenoid collar is uniformly right-handed across the 320 family.

Q4: The handle seems short. Will I get enough leverage for a stuck collar?
A: The 150 mm handle length provides sufficient leverage for the specified 80 Nm tightening torque. For a stuck collar that exceeds 80 Nm (due to corrosion or previous over-tightening), we recommend applying a penetrating oil and allowing it to soak, then using the wrench. The 4140 steel can withstand up to 100 Nm, but exceeding this may risk damage to the collar notches.

Q5: What's the difference between this "Compact" model and your "Pro" model?
A: The Pro model (SW-320P) includes a torque-limiting feature and a reversible ratcheting mechanism, which adds weight and complexity. The Compact model is lighter, simpler, and more affordable-ideal for field technicians who need a straightforward tool for occasional use, and for workshops where simplicity and speed are the priority.

Q6: How do I know when it's time to replace the solenoid, not just re-tighten it?
A: Measure the coil resistance between the two solenoid pins. The specification for the 320 injector solenoid is 2.8–3.5Ω at 20°C. If the resistance is outside this range, or if the coil shows signs of cracking on the insulation, the solenoid should be replaced. The wrench is designed for removal in either scenario-replacement or tightening.

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