Modern clean emissions systems rely on precise sensing and fluid control—and no component is more critical to that mission than the DEF (Diesel Exhaust Fluid) head unit. For McNeilus trucks or vehicles running a Cummins ISL engine, the McNeilus DEF Head Unit (OEM 1604688, Tamerx part 4310-18-31) is mission-critical. If it falters, your SCR system, diagnostics, and even regulatory compliance are at risk.
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Monitors DEF fluid parameters such as level, temperature, and urea concentration, providing accurate data to the engine control module
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Regulates precise dosing of DEF into the exhaust stream so the SCR system can reduce NOx emissions effectively
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Built to the OEM 1604688 specification, ensuring proper fit, calibration, and integration with McNeilus / Cummins ISL systems
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Helps prevent fault codes, check engine warnings, and engine derates caused by misread or degraded sensor signals
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Equipped with a 40-micron filter, guarding against contamination that degrades performance
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Designed to withstand real-world stress: vibration, thermal cycling, and exposure to DEF’s corrosive chemistry
Emissions failures often start with a sensor losing accuracy—typically the DEF head. Installing the OEM 1604688 McNeilus Cummins ISL DEF Head Unit restores sensor integrity, keeps your aftertreatment system functioning smoothly, and helps avoid surprises in compliance or downtime. In the world of emission systems, this is one part you can’t afford to overlook.