Rough cold starts, excessive exhaust smoke, or unbalanced power output? The culprit is likely improper injector adjustment. The M20120-A Injector Setting Fixture delivers the calibration accuracy needed to restore factory performance.

The Crucial Margin of Injection Timing

On classic and electronic Cummins heavy-duty platforms like the NT, N14, L10, and M11 series, mechanical injector height directly establishes injection timing. If the plunger travel is off by even a few thousandths of an inch, combustion synchronization degrades. Setting injectors by "eyeballing" or using unguided indicators leads to over-fueling, rough idling, hard cold starts, and rapid injector lobe wear on the camshaft. The M20120-A fixture provides an unyielding, rock-solid base that locks directly onto the rocker housing assembly. This establishes a stable, completely repeatable alignment track, ensuring technicians can adjust injector height to strict OEM specifications every single time.

• Multi-Engine Cross-Compatibility – A single, highly versatile shop fixture that services Cummins NT, N14, L10, and M11/ISM engine families.
• Repeatable Accuracy – Establishes a rigid, stable reference point to measure precise injector plunger travel and height alignment.
• Fuel Economy & Emission Optimization – Maximizes combustion efficiency to eliminate over-fueling, wet-nesting, and excessive black smoke.
• In-Frame Efficiency – Compact and lightweight profile allows for effortless setup during standard top-end tune-ups inside the truck frame.
• Professional Shop Construction – A durable 4.00 lbs precision-machined steel tool engineered to retain structural calibration across continuous daily shop service cycles.

Stop Swapping Parts. Dial in Factory Specs.

The M20120-A Injector Setting Fixture is an indispensable tune-up asset for high-volume commercial fleet centers, independent diesel repair shops, and vocational maintenance bays. Protect your injectors from premature mechanical failure and smooth out your engine's power curve.

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