3655944 3/4-16UNF Magnetic Pickup MPU Speed Sensor Replacement for Cummins Diesel Engine 6BT 4BT Generator Genset MSP6732C

Product Overview The 3655944 Magnetic Pickup (MPU) Speed Sensor is a high-performance diagnostic component designed for Cummins Diesel Engines and Generator Sets (Gensets). Threaded into the flywheel housing, this premium silver inductor sensor detects when the teeth of the flywheel gear pass the tip, generating electrical pulses to monitor exact engine RPM. It acts as a critical interface for speed governors, control panels, transmission systems, and RPM alarm/ohm switch modules. By delivering highly stable and precise speed signals, it prevents overspeeding and irregular generator frequency, making it an indispensable aftermarket replacement part for commercial power units and excavator fleets. Technical Specifications Main OE Number: 3655944 Interchangeable / Model Cross: MSP6732C, #334A, VDO Type Thread Size: 3/4-16 UNF-2A (M18 Equivalent Fitment) Sensor Length: 100mm (Total insertion depth accuracy) Function: Diesel Generator Frequency / Transmission RPM Alarm Monitoring Material: High-Quality Corrosion-Resistant Stainless Steel (Silver Finish) Condition: 100% Brand New Premium Aftermarket Replacement Broad Vehicle Compatibility This universal magnetic pickup speed sensor has a widespread application footprint, covering major Cummins heavy-duty and medium-duty diesel engine platforms: Series Compatible Models & Engine Applications Cummins B-Series Engines 4BT 3.9, 4BTA, 6BT 5.9, 6BTA 5.9 Mechanical and Turbo Diesel Engines Diesel Generator Sets (Gensets) Compatible with 20kW to 150kW Cummins/Paccar-powered standby and prime power generators Excavators & Machinery Various heavy crawler excavators, construction pumps, and industrial drivetrains powered by B-series Cummins engines Key Benefits Dual-System Utility: Engineered to function flawlessly for both power generation systems (Genset frequency control) and mechanical transmission alarm systems. High Thermal Stability: Built with premium heavy-duty steel internals to withstand extreme flywheel housing heat, vibration, and oily engine room environments. Precision Accuracy: Effectively eliminates erratic voltage/frequency output or “False RPM Alarm” faults, allowing the governor panel to respond accurately to engine loads. Easy Installation: Standard 3/4-16UNF thread profile enables a simple screw-in setup, ensuring proper clearance alignment with the flywheel ring gear. Cross-Reference Guide This sensor interchanges with the following original and aftermarket part numbers: CUMMINS / PACCAR: 3655944 GOVERNOR / AFTERMARKET: MSP6732C, #334A, M18/UNF VDO Style Speed Inductors Maintenance Tip: If your Cummins 6BT generator or excavator engine fails to start, shuts down immediately on an overspeed fault, or the control panel reads “0 RPM,” check the 3655944 MPU sensor. Back it out and wipe the magnetic face completely clean of any ferrous shavings or oil slush. When reinstalling, screw the sensor in until it touches a flywheel tooth, then back it out 1/2 to 3/4 of a turn to ensure the optimal air gap for crystal-clear signal induction.