Cummins N14 STC, Celect, Celect Plus – Service Manual Crankcase Gases (Blowby) Excessive

Symptom Tree  t027

This is symptom tree
Cause Correction

Crankcase ventilation system is plugged

Check and clean the crankcase breather and vent tube. Refer to Procedure 003-001 in Section 3.


Turbocharger oil seal is leaking

Check the turbocharger compressor and turbine seals. Refer to Procedure 010-040 and Procedure 010-049 in Section 10.


Air compressor is malfunctioning

Isolate the air compressor by disconnecting the air inlet and outlet lines. Refer to Procedure 012-014 in Section 12. Check blowby. If blowby is within specifications, rebuild or replace the air compressor.


Cylinder head valve guides are excessively worn

Check the valve guides for wear. Replace the cylinder head, if necessary. Refer to Procedure 002-004 in Section 2.


Piston, piston rings, or cylinder liner is worn or damaged

Inspect the air intake system for leaks. Refer to Procedure 001-043, Procedure 001-047, and Procedure 001-028 in Section 1.

Last Modified:  15-Mar-2012