Cummins N14 STC, Celect, Celect Plus – Service Manual Smoke, White – Excessive (PT™)

Engine block heater is malfunctioning (if equipped)

Check the electrical sources and wiring to the cylinder block heater. Replace the block heater, if necessary. Refer to the OEM service manual.

Coolant temperature is below specification

Refer to the Coolant Temperature Below Normal troubleshooting symptom tree in Section TS.

Engine is operating at low ambient temperature

Check the shutters and engine compartment air. Refer to Operation of Diesel Engines in Cold Climates, Bulletin 3379009.

Fuel grade is not correct for the application or the fuel quality is poor

Operate the engine from a tank of known high quality fuel. Refer to Fuels for Cummins® Engines, Bulletin 3379001.

Lubricating oil rifle pressure during cold start is below specification

Check the viscosity sensor. Refer to Procedure 007-041 in Section 7.

Step timing control system not switching to advanced timing mode

Inspect step timing control operation. Refer to Procedure 006-045 and Procedure 006-046 in Section 6.

Overhead adjustments are not correct

Measure and adjust the overhead settings. Refer to Procedure 003-004 in Section 3.

Raw fuel in the intake manifold

Check the intake manifold for fuel. Refer to Procedure 010-023 in Section 10 and Procedure 003-004 in Section 3. Locate the fuel source and repair as necessary.

Injector cup is damaged or is not correct

Check the injector cups for damage and for correct part numbers. Refer to Procedure 006-026 in Section 6.

Injector(s) are malfunctioning

Perform diagnostics to find the damaged injector(s). Replace the injector(s) as necessary. Refer to Procedure 006-026.

Static injection timing is not correct

Check the static injection timing. Refer to Procedure 006-025 in Section 6.

Coolant is leaking into the combustion chamber

Refer to the Coolant Loss – Internal troubleshooting symptom tree in Section TS.

Valve protrusion is below specification

Check the valve protrusion. Replace the valve seat inserts or the cylinder head. Refer to Procedure 002-004 in Section 2.

Injector protrusion is not correct

Check the injector protrusion. Refer to Procedure 002-004 in Section 2.

Pistons or piston rings are worn, damaged, or not correct

Check the pistons for correct part numbers. Refer to Control Parts List (CPL), Bulletin 4021328. Check the pistons and rings for wear and damage. Refer to Procedure 001-043, Procedure 001-047 in Section 1 and Procedure 003-004 in Section 3.