Fuel Shutdown Solenoid 4942879 for Cummins B3.9, 4BT, 4BTA, B5.9 and 6BT engines

4942879 Fuel Shutdown Solenoid for Cummins Diesel Applications

4942879 provides electrical fuel cutoff control for Cummins B3.9, 4BT, 4BTA, B5.9 and 6BT engines. A reliable replacement combines the complete OE with voltage, connector, bracket, output geometry and engine-side linkage. The application narrows the search, while the removed assembly remains the final dimensional and electrical reference.

4942879 Product Information

Fitment Controls for 4942879

Match the complete stamped reference because voltage, winding, mounting, terminals, output geometry and duty can differ within the same family.

Service Diagnosis Before Replacing 4942879

Check the electrical command, component response and final mechanical movement as separate observations. This prevents a wiring, control-module or linkage fault from being mistaken for a failed replacement part.

4942879 Replacement Approval Checklist

Release the order only after electrical, mechanical and application evidence agrees with the removed assembly.

4942879 Technical FAQ

What voltage must be confirmed for 4942879?

4942879 is covered here as 24V. Confirm the charging system and old label, then measure voltage at the connector during the start or stop command. A battery description alone is insufficient when converters, relays or earlier harness repairs may have changed the actual supply.

What should be checked on Cummins B3.9, 4BT, 4BTA, B5.9 and 6BT engines before ordering 4942879?

Use 4942879 as the first control, then compare the old label, voltage, connector face, mounting-hole centers, output end and operating direction. Record the engine or machine model and serial number, but do not use the model name alone because production changes can introduce another shutdown arrangement.

Can the listed engine or machine model alone confirm 4942879?

No. Application data narrows the candidate family, while the complete OE, voltage, bracket, connector and output geometry establish fitment. Production changes and previous repairs can place more than one shutdown arrangement in the same model range.

What should be tested when 4942879 does not move?

Measure voltage at the connector during the actual command, not only with the circuit unloaded. Check ground continuity, relay contacts, fuse condition and connector resistance. A normal open-circuit reading can collapse under load when terminals are corroded.

Why can the solenoid move while the engine fails to shut down?

The output may not carry full travel to the fuel lever because of free play, wrong adjustment, bracket flex or a binding pivot. Observe the lever itself and verify that it reaches the mechanical stop before treating the electrical actuator as the only fault.

What should be compared with the removed 4942879 assembly?

Compare the full label, voltage, connector face, terminal count, mounting-hole centers, body orientation, output end, resting length and working travel. Include one wider installed photo showing pump, lever or surrounding clearance because close product images can hide the geometry that decides fitment.

How can repeat electrical or coil damage be prevented?

Correct the original failure cause before installation. Check supply voltage, pull/hold timing, linkage resistance, mechanical stops, terminal tightness, heat and moisture exposure. A new unit can fail quickly when the high-current stage remains energized or the output cannot complete its designed stroke.

Request a Quote for 4942879

Send the complete reference group, confirmed voltage, Cummins B3.9, 4BT, 4BTA, B5.9 and 6BT engines, removed-part photos, measurements and order quantity for a fitment-focused B2B quotation.