Speed sensor 3971994 is an instrumentation element: it measures an engine variable and reports it to the controller, which decides whether to alarm or shut down.
Before replacing, compare the reading against an external gauge and inspect the connector. Half of all "bad sensors" are loose terminals or a chafed wire to ground.
Specifications and compatibility
- Applicable to
- CUMMINS 4BT SERIES
- Size
- 18mm
- Dimensions
- 5 x 5 cm
- Weight
- 0.20 kg
How to verify before ordering
- Match measuring range and output curve (resistance, 4–20 mA or 0–5 V) to what the controller expects.
- Check thread type and length; a sensor that does not seat leaks and reads wrong.
- Confirm maximum admissible pressure or temperature against the actual mounting point.
Frequently asked questions
Can I bridge the sensor to keep running?
Only as a diagnostic test, never in permanent service. Bridging removes the protection and a real fault goes unnoticed.
Why does the alarm only appear when hot?
The fault is in the sensor insulation or in the connector, which expands with temperature. Cold resistance is correct so no alarm shows.
Related parts
- SENSOR DE VELOCIDAD 3034572
- SENSOR DE VELOCIDAD 213272
- SENSOR DE VELOCIDAD M18X1.5
- SENSOR DE VELOCIDAD 4327239
- SENSOR DE TEMPERATURA 3015238
See the spare parts catalogue or request a quotation quoting the equipment reference. Third-party trademarks are cited for identification purposes only.
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Specifications
| Characteristics | |
|---|---|
| Size | 18mm |
| Applicable To | CUMMINS 6BT series, CUMMINS 4BT series |
| Weight | 0,20 kg |
| Dimensions | 5 x 5 cm |
| Spare Parts | |
|---|---|
| Sensor | Speed sensor |
| Others | |
|---|---|
| Property | MAGNETICK PICK UP |
| Shape | M18x1.5 |