N14 Base Engine Troubleshooting and Repair Manual – Crankcase Gases (Blowby) Excessive

Symptom Tree  t027

This is symptom tree t027
Cause Correction

Crankcase ventilation system is plugged

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


Turbocharger oil seal is leaking

Check the turbocharger compressor and turbine seals. Refer to Procedures 010-040 and 010-049.


Air compressor is malfunctioning

Isolate the air compressor by disconnecting the air inlet and outlet lines. Refer to Procedure 012-014. 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.


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

Inspect the air intake system for leads. Refer to Procedures 001-043, 001-047, and 001-028.

Last Modified:  05-Jan-2004